Thick Section Casting Specifications and Practices in Singapore
High peak (curing) temperature caused by the exothermic process of cement–water reaction is one of the concerns in mass concrete elements. In land-scarce Singapore, building and infrastructure constructions are growing at a rapid rate and these constructions are in need of thick (mass) concrete sections to carry or facilitate the transfer loads to responsible elements. Mass concrete elements cast with large pours of concrete helps in enhancing the durability in terms of minimizing the number of construction joints. They are also economical in terms of catching up with tight construction schedules and the use of less manpower and constructional equipment thus leading to resource savings. Yet it is a challenge to carry out large pours with consideration of temperature controlled concrete (TCC) specifications locally. This is partly due to the prevailing tropical weather conditions which have a tendency to rise the concrete temperature more rapidly and the peak temperature in mass concrete elements. It is also very challenging for Ready-Mix Concrete (RMC) suppliers to achieve low fresh concrete temperatures on-site with local weather conditions. Therefore, the selection of right RMC supplier with commitment and due attention to logistical and technical considerations is crucial in terms of consistent concrete supply and optimal TCC performance on strength and heat of hydration. This paper presents one of the recent single largest pours of 18,000 m3 with C32/40 TCC for casting of the raft foundation at the Marina One (Hyundai-GS JV) Project in Singapore by the Alliance Concrete Singapore Pte Ltd. The parameters that influence temperature rise in mass concrete elements, and the measures taken to control the specifications associated with mass concrete castings in Singapore shall be discussed. The in situ thermocouple monitoring and adiabatic temperature rise laboratory testing results associated with this largest pour casting are also presented.
KeywordsMass concrete Ready mix Temperature Insulation Cracking and DEF
This work is from the Alliance Concrete Singapore Pte Ltd’s single largest pour supplied to Marina One (Hyundai-GS JV) Project. The support from Alliance Concrete Singapore and the Marina One (Hyundai-GS JV) Project teams are gratefully acknowledged.
- 1.ACI 207.1R-05. (2005). Guide to mass concrete (ACI Committee 207 Report).Google Scholar
- 2.ACI 301-10. (2010). Specifications for structural concrete (ACI Committee 301 Report).Google Scholar
- 3.Neville, A. M. (2011). Properties of concrete (5th ed.). London: Pearson.Google Scholar
- 4.Bamforth, P. (1984). Mass concrete. Concrete society digest no. 2. London: The Concrete Society.Google Scholar
- 5.Harrison T. A. (1992). Early age thermal crack control in concrete (CIRIA Report 91).Google Scholar
- 6.Land transport authority M&W Specifications for civil & structural works. (2010). Singapore.Google Scholar
- 7.SS-EN 197-1: Cement—Part 1: Composition, specifications and conformity criteria for common cements. (2011).Google Scholar
- 8.Daneti S. B. (2015, August 27–28). Largest pour of temperature controlled concrete for raft foundation casting at marina one project in Singapore by Alliance Concrete. 40th Conference on Our World in Concrete & Structures (pp. 27–28), Singapore.Google Scholar