Early-Age Structural and Thermal Performance of GGBS Concrete

Authors: Kangkang Tang

Abstract:

A large amount of blast furnace slag is generated in China. Most ground granulated blast furnace slag (GGBS) however ends up in low-grade applications. Blast furnace slag, ground to an appropriate fineness, can be used as a partial replacement of cementitious material in concrete. The potential for using GGBS in structural concrete, e.g. concrete beams and columns is investigated at Xi’an Jiaotong-Liverpool University (XJTLU). With 50% of CEM I cement replaced with GGBS, peak hydration temperatures determined in a suspended concrete slab reduced by 20%. This beneficiary effect has not been further improved with 70% of CEM I replaced with GGBS. Partial replacement of CEM I with GGBS has a retardation effect on the early-age strength of concrete. More GGBS concrete mixes will be conducted to identify an ‘optimum’ replacement level which will lead to a reduced thermal loading, without significantly compromising the early-age strength of concrete.

Keywords: GGBS, thermal effect, sustainable construction, CEM I.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338257

References:

[1] World Bank (2014), “GDP per capita, PPP (current international $),”See http://data.worldbank.org/indicator/NY.GDP.PCAP.PP.CD?order=wbap i_data_value_2013+wbapi_data_value+wbapi_data_valuelast& sort=desc (Accessed on 20/1/2015).
[2] S. Zheng and H. Liu, "Interaction among construction investment, other investment and GDP in China," Tsinghua Science and Technology, 9 (2) 2004, pp. 160-167.
[3] K. Tang, “High Value Applications of GGBS in China” in The 2014 World Congress on Advances in Civil, Environmental &Materials Research (ACEM14), Techno-Press, Busan, Korea, 2014.
[4] K. Tang, S. Millard, and G. Beattie, "Technical and economic aspects of using GGBFS for crack control mitigation in long span reinforced concrete structures," Construction and Building Materials, 39 (1) 2013, pp. 65-70.
[5] PRC Ministry of Construction, "GB/T 18046-2008 Ground granulated blast furnace slag used for cement concrete," General administration of quality supervision, inspection and quarantine of the People's Republic of China, 2008.
[6] J. Tan, "The effect of GGBS on concrete and its applications," Guangdong Jiancai (2) 2007, pp. 15-17.
[7] A. M. Neville, "Properties of concrete," England, Pearson, 2011, London, UK.
[8] K. A. Paine, L. Zheng, and R. K. Dhir, "Early-Age Temperature Rises in GGBS Concrete - Part 2: T1 Values for Low Heat and Very Low Heat Cements" in Proceedings of International Congress - Global Construction: Ultimate Concrete Opportunities, 2005, London, Thomas Telford, pp. 183-194.
[9] L. Zheng, K. A. Paine, and R. K. Dhir, "Early-Age Temperature Rises in GGBS Concrete: Part 1: Determination of T1 Values"in Proceedings of International Congress - Global Construction: Ultimate Concrete Opportunities, 2005, Thomas Telford, London, UK, pp. 173-182.
[10] P. B. Bamforth, "CIRIA C660 Early-age Thermal Crack Control in Concrete," London, CIRIA, 2007.
[11] R. K. Dhir, K. A. Paine, and L. Zheng, "Design data for use where low heat cements are used DTI Research Contract No. 39/680, CC2257. Report No CTU 2704," University of Dundee, 2006.
[12] A. Bougara, J. Khatib, and H. Khellafi, “Some parameters affecting the heat of hydration of blast-furnace slag cement” in 1st International Conference on Sustainable Built Environment Infrastructures in Developing Countries, 2009, ENSET Oran, Algeria, pp. 9-16.
[13] SHJJW, "DG/TJ08-501-2008. Code for utility technique of granulated blast-furnace slag used in concrete," SHJJW (Shanghai Urban-Rural Development and Transport Commission), Shanghai, China, 2008.
[14] W. R. L. Da Silva, V. Milauer, and P. Temberk, "Up scaling semiadiabatic measurements for simulating temperature evolution of mass concrete structures," Materials and Structures/Materiauxet Constructions, 2013, pp. 1-11.
[15] BSI, "BS 8500-1: 2006 Complementary British Standard to BS EN 206- 1. Method of specifying and guidance for the specified," British Standards Institution (BSI), 2006.