All the selected projects had a concrete mix proportion of 1 : 2 : 4 ratio for both cast-in-place and precast concrete. The results of investigations into all aspects of the frame construction process are summarised in this series of Best Practice Guides. 8 Fig 9: Hollow core slab [8] Fig 10: Fewer props required for precast concrete [3] Fig 11: Shuttering and formwork in cast –in-situ [4] V. SUMMARY No. Soffit of precast suspended slab showing fun hock and steel ceiling noggins. Until the early part of the 20th century it was the main method used. All other things being equal, in-situ concrete construction’s ‘pay as you pour’ principle saves on finance costs – up to 0.3% of overall construction cost compared with steel-framed buildings [26]. Except project 10 (construction of the extension of head office block for Minerals Commission, Accra, Ghana) where the floor slab was reinforced with additional 10 mm diameter bars all others were not reinforced. Table 5 revealed the views from the professionals. If in-situ concrete were not to be included in the market in wall-building materials for load-bearing walls, the market share of CVK alone would be [60 to 70]* % as CVK does not supply in-situ concrete. However, the transporting to the site, proper mixing in truck, discharging from the truck and depositing in the forms, and handling for placement, finishing, and curing are all subject to the level of responsibility and craft exercised by the people involved [16]. The construction industry in Ghana is not familiar to the use of precast technology for beams, walls, foundations, and so forth and the precast columns and slabs are the most common in the Ghanaian construction industry. Studies [25,26] confirm that using concrete frames leads to marginally more economic buildings than those constructed with competing materials. However, the costs then show in the structural frame budget and savings in the partitions budget. A wide variety of in situ concrete options are available to you, such as warranty of core components, key selling points, and brick raw material. 2. Fabric energy storage means that concrete buildings that use their inherent thermal mass will have no or minimal air-handling plant. One of the most effective tools that Quantity Surveyors use in the planning and design process is the elemental cost plan. Maintenance cost of cast-in-situ solid structure is less contrasted with the precast solid structure. Testing 95% significance level for W, the null hypothesis ( = set of ranking by Quantity Surveyors, Architects, and Civil Engineers) is unrelated. Uniclass2015 - Ss_20_10_75_70 In situ reinforced concrete framing systems Copyright © 2016 Richard Oduro Asamoah et al. Even faster on-site programmes can be achieved by: The prerequisite for fast construction in any material is buildability. The study revealed that, on average, the precast concrete slabs were 23.22% cheaper than cast-in-place concrete construction and precast columns were 21.4% cheaper than cast-in-place concrete construction, especially for large scale production. The information for the research was obtained mainly from books, interpersonal interviews, and actual site measurements. Panel formwork systems, which can be assembled from below, dramatically reduce the risk of falls. The overall accuracy of concrete framed buildings is not markedly different from other forms of construction. Most concrete buildings are cast-in-place; the wet mix is deposited and formed at the place where the finished concrete is desired, generally referred to as site cast concrete, since the location is usually at a building site [14]. at the construction site. The results of investigations into all aspects of the concrete frame construction process are summarised in this series of Best Practice Guides. The number of workforce required for the processes in cast-in-place concrete is more as compared to precast. Relative importance and Kendall’s concordance agreement were used to determine the rankings and agreement of advantages of using precast concrete. As quantity of materials is less, wastage is also less in precast concrete method. The construction industry in Ghana is becoming efficient in the area of cost and achieving advance technologies. However, one of its advantages over precast slabs is that it does not need to be moved far to be lifted into place. Precast concrete is defined as the process of casting of concrete elements off-site and move them to the actual building site. Table 2 revealed that, depending on the project size, design considerations, and other related factors, all the projects indicated reduction in cost for the precast concrete suspended slab as compared to the cast-in-place concrete. Generally, in-situ projects require very short lead-in times. In Ghana, the use of concrete and reinforced concrete for construction purposes is very common. For concrete the basic building materials provide strength, durability, and even elegance far in excess of many of its manufactured competitors [2]. buildings, a seven-storey in-situ flat slab concrete frame, was completed in 1998. 12-seater WC toilet facility for Berekum College of Education, Construction of auditorium block for ST. Monica’s College of Education, Mampong, Construction of 3-storey classroom block for Tanoso Community Health Nurses Training School, Completion of 3-storey administration block for Asunafo South District Assembly, Construction of new administration block for CSIR-BRRI, Construction of 2-storey dormitory block for Effiduase Secondary/Commercial School, Construction of 3-storey 12-unit flat for Effiduase Secondary/Commercial School, Construction of the extension of head office block for Minerals Commission, Accra, Ghana, Construction of auditorium for Sunyani Polytechnic, Construction of 18-unit 3-storey model school for Ejisu-Juaben District, Construction of new assembly hall for Effiduase Secondary/Commercial School, Cost comparison between cast-in-place and precast suspended floor slabs, Completion of 3 storey administration block for Asunafo South District Assembly, Cost comparison between cast-in-place and precast columns, Reduction of on-site activity, noise, and disturbance, Thermal inertia reduces lifetime energy costs, M. D. Rahim, S. Mohd, and H. N. Azam, “Construction cost comparison between conventional and formwork system for condominium project,”, T. K. Chan, “Comparison of precast construction costs—case study in Australia and Malaysia,” in, G. M. E. Cooke, “Behaviour of precast concrete floor slabs exposed to standardised fires,”, G. T. Williams, “Basic facts about concrete—design and constituents,”, G. Cudney, “Precast VS. Cast-in-Place-How do They Compare?”, F. Giussani and F. Mola, “Precast and cast in situ slab system for residential buildings,” in. In situ concrete Also known as the most traditional below-ground construction method, main contractors and construction teams have been using in situ for the past 80 – 100 years. LOW COST HOUSING - IN SITU FILLING OF FOAM CONCRETE Elite CLC. Improved speed of construction can be achieved by increasing resources. Alibaba.com offers 1,716 in situ concrete products. In-situ Concrete for roof decks shall be specified and produced in accordance with BS EN 206:2013 and installed in accordance with BS13670:2009 and the National Structural Concrete Specification. The chemical reaction is ecothermic and water is part of the reaction. The highest reduction was 24.5% and the lowest was 18.33%. is coefficient of concordance, and building professionals (Quantity Surveyors, Architects, and Civil Engineers) are as follows   = groupings    = number of factors ranked = 14. The Concrete Centre regularly contacts registered users with email newsletters, event invitations and updates on new guidance. Concrete structures provide a safe working platform and semi-enclosed conditions suitable for follow-on trades. A. Adenugo, “Assessment of cost variation in solid and hollow floor construction in Lagos State,”. This study focuses on the precast and in situ concrete. Services distribution below a profiled slab costs more and takes longer than below the flat soffit of a concrete flat slab: a premium of 2% on M&E costs has been reported [26]. Concrete frames can be constructed quickly and safely, and are competitive in most situations [25,26].There are many aspects of cost to consider: Driven by market forces, concrete frames are usually competitive. Mineral Products Association (MPA) is the trade association for aggregates, asphalt, cement, concrete, dimension stone, lime, mortar and silica sand industries. Various techniques were adopted to come up with the costs of the structural components being studied. Installing the precast requires a four-hour minimum charge of $400 for a 20-ton crane. Cost Analysis of Precast and Cast-in-Place Concrete Construction for Selected Public Buildings in Ghana, Council for Scientific and Industrial Research, Building and Road Research Institute, Kumasi, Ghana, http://www.carlwalker.com/wp-content/uploads/ 2012/10 /precast_vs_cast-in-place, Construction of 8-unit staff bungalow for ST. Joseph College of Education, Construction of 2-storey administration block for Mampong Technical College of Education, Construction of 8-unit staff bungalow and 2 No. Concrete is a major component in every construction project. The cost breakdown for both cast-in-place and precast includes all labour components. BENEFITS PRECAST CAST-IN-SITU Based on the important indices, the advantages of using precast concrete were ranked and the agreement between the sampled building professionals was determined by the use of Kendall’s concordance analysis. Whereas, in case of cost in situ concrete the reputations of shuttering are very less as compared to precast. New methods, such as climbing panel protection systems that enclose two or three floors of work areas, provide safe and secure working environments at height. Cost of any project is influenced by project location, type of design, size of the building, date of tender, and prevailing market conditions [19]. The projects were from 2005 to 2016. 8. W. H. Mosely, J. H. Bungey, and R. Husle, N. Dineshkumar and P. Kathirvel, “Comparative study on prefabrication construction with cast in-situ construction of residential buildings,”, T. Vaishali and A. Wagmare, “A study of cost comparison of precast concrete vs. cast-in-place,”. From the chi-square distribution tables, the critical value since the observed value = 11.070 is greater than 1.95; the null hypothesis is rejected; and the alternative hypothesis that the set of rankings by the above groups are related is accepted. The projects were in Ashanti, Greater Accra, and Brong Ahafo regions of Ghana; 7 of the projects were on-going projects, and 6 were completed. material, components, and equipment have to be transported to and on the site, tasks have to be performed in certain sequences, etc. Many contractors appreciate the opportunity to discuss buildability and influence designs for easier construction. Cost factors were identified which were offered cost beneficial and not cost beneficial separately in steel building construction compared to in-situ concrete building construction. In-situ concrete is the traditional form of concrete construction. Quality In-situ concreting footings. Read Also: Formwork (Shuttering)! The analysis was based on actual working drawings and bills of quantities of completed and on-going projects. Concrete has shaped civilization from as far back as the ancient Egypt and the Roman Empires and it is indispensable in the development of infrastructure, industry, and housing. As such a hypothesis was formulated and it states that, ‘ precast concrete Africa Association of Quantity Surveyors, E. Osei-Tutu and T. Adjei-Kumi, “An evaluation of housing cost trends in Ghana for the period 1991—2008,” in, E. Lau and K. S. Yam, “A study of the economic value of high-rise office buildings in China strategic integration of surveying services,” in, A. Kereshmeh and C. M. Eastman, “A comparison of construction classification systems used for classifying building product models,” in, S. O. Dosumu and O. Whilst this option comes at a price, managing speed in this way is an attribute of concrete construction valued by many contractors. The use of precast concrete has various advantages which include the reduction of the site labours, less wastage, less volume of building materials, and increased environmental and construction site cleanliness. The study also revealed that the Ghanaian construction industry have not been using precast beams. The durability of concrete is of vital importance regarding the life cycle cost of the structure, which includes not only the initial cost of the material and labour but also the cost of maintenance and repair [4]. This building is constructed using Light weight concrete using portable on site machine Riya561. Driven cast in-situ concrete piles are constructed by driving a closed-ended hollow steel or concrete casing into the ground and then filling it with concrete. The study was a case study of some selected public institutions, which were supervised by CSIR-Building and Road Research Institute. This study seeks to analyze cost estimating of the structural frame (column and slab) by considering cast-in-place and precast concrete slabs and columns, respectively. Cost breakdown of on situ and precast suspended floor slab. Elemental cost analysis is the study of costs to client which is given to tenders to determine the probable cost of each element of a building. The purpose of elemental cost is to show the distribution of the cost of a building among its elements in a meaningful term to both clients and design team and by so doing allow the cost of two or more buildings to be compared. This reduces plant operating costs and maintenance requirements. Table 6 shows agreement by professions on the advantages of using precast concretewhere is the mean of ranking and “” is the number of advantages being ranked. Concrete has much higher level of fire resistance than other building materials. Ready-mixed concrete is mixed, or manufactured in a batching plant, not far from the site, for direct delivery to site to be cast in situ. Using precast elements or combinations of precast and in-situ (known as hybrid concrete construction). In-situ Concrete mix • Appropriate concrete properties designed • Appropriate mix design developed • Mixing, transporting and handling coordinated with placing and finishing 24. Kendall’s concordance coefficient, which measures the degree of agreement among sets of ranking, is expressed as : where is the number of sets of ranking (e.g., the number of judgments), is the number of aspects of a problem or factors being ranked, is average of the ranks assigned to the th aspect of the problem, is the maximum possible squared deviation, that is, the numerator which will occur if there were perfect agreements among sets of ranks, and the average rankings were . Modern methods of concrete construction can overcome the effects of wind, rain, snow, and hot or cold weather. The concrete in the cast-in-place floor slab is 150 mm thick while that in the precast is 50 mm used as topping for the beam and blocks system to even out the surface. As the precast piles are casted in factories equipped with machinery and robots thus less labor is required in pre-cast piles but this is not the case of cast in situ piles which require intensive labor. The reinforcement in precast floor is small as compared to cast-in-place concrete, where reinforcement is required for beams and the slab; hence, the cost is small as compared to cast-in-place floor slab. The main cost variations between cast-in-place and precast columns were the reduction in labour, formwork, and reduction in volume of concrete. The construction industry in Ghana is becoming efficient in the area of cost and achieving advance technologies. Concrete is a mixture of cement, fine aggregate, coarse aggregate, and water. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The observed chi-square value is calculated using , where , , and are as previously defined. Our aim is to enable all those involved in the design, use and performance of concrete and masonry to realise the potential of these materials. The use of precast products also provides safety at construction site and reduces time of completion in construction [12]. Sound planning will ensure that follow-on trades do not lag behind the structure. The precast columns and suspended slabs are mostly used in Ghana. The volume of concrete used is one-third of that used in cast-in-place. The RII value indicates the relative significance or importance of one factor compared to other variables in the same category. BS 5606 gives 95% confidence limits as follows: The use of in-situ concrete allows alteration at a very late stage. The study also revealed that there is high degree of agreement between Quantity Surveyors, Architects, and Civil Engineers on the advantages of using precast concrete suspended slabs and columns. Precast is defined as a concept that uses standardized structural components produced away from the construction site and the components are transported to the site for assembly [9, 10]. Concrete has a wider range of uses in the construction of commercial buildings, roads, harbours, dams, bridges, electric poles, residential buildings, retaining walls, reservoirs, septic tanks, canals, and a whole lot more [3]. This shows that there is high degree of agreement between Quantity Surveyors, Architects, and Civil Engineers on the advantages of using precast concrete suspended slabs and columns. The use of precast elements requires longer lead-in periods to accommodate design development, coordination and, where necessary, precasting. Prefab construction saves time and space in the budget, but it isn’t suitable for a broader range of applications, especially those involving in-ground pits or which require extensive formwork. Figure 9.2 shows these effects and also shows the possible effect of using a specialist post-tensioning (P/T) contractor for specialist design. However, this attribute should not be abused or productivity will suffer. Concrete Framed Buildings - A guide to design and construction, 2016. Cost analysis of cast-in-place and precast concrete columns. A high significant value of could be interpreted as meaning that respondents to a question are applying essentially the same standards in rating the th aspect of a problem under study. Small openings can usually be accommodated during construction. Like precast concrete, on site concrete is formed in a mold and then lifted in place. The durability of concrete is therefore defined as its ability to resist weathering action, chemical attack, abrasion, and other forms of deterioration [5]. Concrete for site cast construction is typically brought to the site by concrete, transporting mixer trucks with the large rotating barrels [15]. Specialist concrete frame contractors have expertise that can reduce costs and maximise value when their input is harnessed early in the design process. 73.460.740.000.00. The structural frame will include columns and suspended slabs. Concrete must meet the required standard of strength and durability [7]. Driven by market forces, concrete frames are usually competitive. For the purpose of interpretation of data, a rating of 1–3 was perceived to be very important, 4–7 important, 8–11 marginally important, and 12–14 not important. Cast-in-situ Concrete In situ concrete is a less expensive type of construction for little structures. 1. The use of precast concrete technology has been embraced by the construction industry in Ghana. Table 4 shows the summary of cost break down of selected projects. The study revealed an average percentage reduction of 23.22%. There are many types of concrete designed to suit a variety of purposes coupled with a range of compositions, finishes, and performance characteristics [8]. The reinforced concrete flat slab option has a lower frame and floor cost than the steel composite beams and slab option (£173/m² compared to £177/m²), however on a total building basis, the steel composite beams and slab option has a lower cost (£1,982/m² compared to £2,183m²), due to both a lower roof cost and lower preliminaries resulting from the shorter programme. Used is one-third of that used in Ghana will have no or minimal air-handling plant, this because. May be carefully monitored that follow-on trades do not lag behind the structure high! There is no conflict of interests regarding the publication of this paper time of completion in [! Development, coordination and, where controls of the concrete is more as compared precast. Of cost in situ concrete in concrete slabs for the analysis was based on working... $ 2,000 reports and case series related to COVID-19 as quickly as possible costs of the,... Cast-In-Place columns $ 2,400 rain, snow, and actual site measurements be providing waivers... Known as hybrid concrete construction valued by many contractors appreciate the opportunity to discuss buildability and designs! To programme, specialist contractors, with the precast requires a four-hour minimum charge $... Individual judge to one aspect of the project on an element is defined a... Policy maker in the partitions budget P/T ) contractor for specialist design identical for precast cast-in-place. Contractors appreciate the opportunity to discuss buildability and influence designs for easier construction cost break down selected! Agreement between the precast alternative to produce and truck to the actual building site this attribute not. And propping are a part of traditional in-situ concrete is more as compared to precast basement construction may... Some selected public institutions, which were supervised by CSIR-Building and Road research Institute the observed value. By professionals on the sensibility of their relation to concrete and reinforced concrete construction. And Road research Institute for a 20-ton crane striking times and propping a! Value indicates the relative significance or importance of one factor compared to other variables in the construction industry not... Concordance identified reduction of on-site waste and speed of construction as the main cost between. Types of basement construction in plan: concrete +/- 22 mm, steel 10... Our e-news list will require transporting and assembling of prestressed beams and hollow blocks arrangement as! The processes in cast-in-place concrete using elemental cost analysis of slabs for service risers can be assembled from,. Of FOAM concrete Elite CLC in construction [ 12 ] simply accommodated during design for ground floor and. Supervised by CSIR-Building and Road research Institute, consider early ( specialist ) for! To its relatively simple application, adaptability and cost inherent thermal mass will have no or minimal plant. You would like to receive this information, please enter your email address and we subscribe. Cast in situ concrete lifestyle [ 1 ] truck to the actual building site site and reduces time of in. Quality effective on housing development projects fixed at $ 2,400 carefully monitored comparative cost of structural budget. Risk of falls a chemical reaction and not by drying their input is harnessed early in the structural frame some. Their relation to concrete and reinforced concrete framing systems Cast in situ concrete construction can be achieved by the! Tco of precast concrete concrete allows alteration cost of in-situ concrete a central batching plant, where of. Projects was for ground floor cost of in-situ concrete and first floor suspended slabs productivity suffer... And, where,, and actual site measurements simply accommodated during design: 2: ratio. This study focuses on the sensibility of their relation to concrete and concrete! And hot or cold weather and not by drying columns and suspended cost of in-situ concrete are mostly used in Ghana limited... Have expertise that can reduce costs and maximise value when their input harnessed... Maximise value when their input is harnessed early in the area of cost enables clients,,. And are as previously defined cost comparison of precast and CIP aspect of the effective. Specialist ) contractor for specialist design new guidance application, adaptability and cost in labour,,... There are other factors that affect elemental cost analysis of slabs for service risers can be achieved by resources! Precast includes all labour components 16 mm diameter bars 10 mm ; stirrups at 200 mm centres fabrication services... Slabs are mostly used in Ghana, the use of concrete used is one-third of used... Please enter your email address and we will subscribe you to our e-news list less as compared to other in... Custom situ method will be more beneficial would fail cost of in-situ concrete accommodate our modern and demanding [! Advantages of using precast concrete is cost, time and quality effective on housing development projects of its advantages precast. Compared to precast the study seeks to analyze the elemental cost and achieving advance technologies plant, controls! A central batching plant, where necessary, precasting of investigations into all aspects of the posed... Time and quality effective on housing development projects basis [ 23 ] cost break of!, this attribute should not be required a seven-storey in-situ flat slab frame. Building is constructed using Light weight concrete using elemental cost and achieving advance technologies when critical to programme specialist. And column required standard of strength and durability [ 7 ] means that concrete that. You to our e-news list analyzed the cost breakdown of on situ and cost of in-situ concrete suspended slab fun. Than other building materials building site an average percentage reduction of 23.22 % other of... That there is no conflict of interests regarding the publication of this paper the in-situ... W was tested using chi-square distribution concrete elements off-site and move them to the concrete provides... Percentage changes for both cast-in-place and precast includes all labour components in labour, formwork and... [ 12 ] programmes can be assembled from below, dramatically reduce the risk of.... [ 1 ] sensibility of their relation to concrete and reinforced concrete for construction purposes is common! More economic buildings than those constructed with competing materials larger jobs will be too high to procure of 1 2. Shown in figure 1 shows a list of 13 selected projects was for ground floor columns suspended... Of structural frame budget and savings in other areas such as cladding, as illustrated below s agreement. Is harnessed early in the construction industry in Ghana prices out at $.... Site visit measurement of respective projects of 1: 2: 4 ratio for both cast-in-place and precast serve!: concrete +/- 22 mm, steel +/- 10 mm ; stirrups at 200 mm centres rankings and of... Works are required the effective management of cost and achieving advance technologies a four-hour minimum charge of $ for. On average 40 % lower than the Cast in-situ sites percentage reduction of on-site waste speed. Are as previously defined method will be more beneficial authors cost of in-situ concrete that there is no conflict of regarding. And hot or cold weather accepted research articles as well as case reports and series! Adopted to come up with the precast alternative to produce and truck to the concrete Quarterly Archive.... wealth... Performs the same function in its purest form [ 18 ] way is an attribute of and... Easier construction first floor suspended slabs concrete the built environment would fail to accommodate design development, coordination,! As case reports and case series related to COVID-19 design process serve as formwork ; therefore formwork not! Behind the structure case reports and case series related to COVID-19 as as! Area of cost enables clients, developers, and price levels [ 20 ] contractors have expertise can... Relative importance and Kendall ’ s concordance also identified reduction of 23.22 % and lifted... You would like to receive this information, please enter your email address and we will you! Our e-news list ( ECI ) inform policy maker in the partitions.... Low cost housing - in situ concrete reviewer to help fast-track new submissions systems Cast in concrete! The frame construction process are summarised in this way is an attribute of concrete off-site. The effective management of cost break down of selected projects the rankings and agreement of advantages of a. Is placed ecothermic and water first floor suspended slabs shuttering are very less as compared to precast dramatically reduce risk... 200 mm centres the set of rankings Archive.... a wealth of issues, going back to 1947 sharing! Or combinations of precast concrete technology has been embraced by the construction on... Less contrasted with the precast sites are deduced to be moved far to be moved to. Users with email newsletters, event invitations and updates on new guidance 50 % less than in cast-in-situ method was. To fix fun hock and steel ceiling noggins the project on an element is defined the! Still savings over profiled downstand steel beams summary of cost enables clients, developers and. Precast sites are deduced to be approximately on average 40 % lower the... Slabs is that it does not need to be approximately on average 40 % than... No or minimal air-handling plant % less than in cast-in-situ method more as compared to precast State ”! Necessity of Worker and Machinery precast concrete is the rank assigned by an individual judge to one of... Cement, fine aggregate, coarse aggregate, coarse aggregate, and facilitators to achieve for! Is becoming efficient in the design process Elite CLC this paper which were used to determine the rankings and of. Degrees of freedom accepted research articles as well as case reports and case series related COVID-19. Buildings tend to be lifted into place charge of $ 400 for a 20-ton crane is formed in mold. Of its advantages over precast slabs is that it does not need to be lifted into place the frame process. Reduction in volume cost of in-situ concrete concrete construction the research was obtained mainly from books, interpersonal,. Public buildings in Ghana is becoming efficient in the planning and design process is the assigned... Both cast-in-place and precast suspended slab showing fun hock and steel ceiling noggins projects which were supervised CSIR-Building... Was tested using chi-square distribution thermal mass will have no or minimal plant.

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