THE MECHANICAL STRENGTH AND DRYING SHRINKAGE BEHAVIOR OF HIGH PERFORMANCE CONCRETE WITH BLENDED MINERAL ADMIXTURE
DOI:
https://doi.org/10.11113/jt.v81.13209Keywords:
High strength concrete, flowable concrete, mineral admixtures, mechanical properties, drying shrinkage behaviorAbstract
With the fast in population development, there are a higher demand in housing and infrastructure such as high-rise buildings and long-span bridges. Therefore, high performance concrete (HPC) is used massively due to its technical and economical advantages to fulfil people demands towards the concrete usage. Optimum mineral blended admixture replacement ratio with the addition of superplasticizer are the main component which contributed to the formation of HPC in terms of high workability, high strength and high durability. Hence, the optimal cement to blended mineral admixture ratio with the optimum addition of PCE type superplasticizer to achieve the targeted mechanical strength performance of G60 and reduce the drying shrinkage behavior which will results in crack of the ternary blended concrete is highlighted in this report. The influence of the addition of two mineral blended admixture, ground granulated blast furnace slag (GGBS) and pulverized fly ash (PFA) with the ordinary Portland cement (OPC) in different ratio on engineering performance and its drying shrinkage behavior in the age of 7 days, 28 days and 90 days based on different mineral blended admixture replacement level in 50%, 60%, 70% and 80% which GGBS to PFA ratio are controlled in 4:1 and the water to cement ratio was kept in 0.35 is studied. There are two types of PCE type superplasticizer (SP) was added to enhance the workability of the fresh concrete and act as slump retainer. Ternary blended concrete results in low early age (7 days) strength but the performance at later age (28 days and beyond) was encouraging. Results revealed that 80% replacement level have the remarkable result in terms of mechanical strength and drying shrinkage behavior. The study showed that, presence of mineral additives with superplasticizer will produce a similar or enhance the concrete strength properties with the inclusion of GGBS and PFA at the ratio of 4:1 up to 80% as cement replacement.
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