Compressive Strength of TBC at Elevated Temperatures with Different Cooling Regimes
01 Jan 2021-pp 227-239
TL;DR: In this paper, the authors used the sugar cane bagasse ash (SCBA) and silica fume (SF), a mineral admixture as partial replacements for cement, thereby resulting in the formulation of ternary blended concrete.
Abstract: It is a foregone conclusion that the manufacturing process of cement adds 5% of the annual anthropogenic global carbon footprint. Researchers have extensively used different types of mineral admixture include ground granulated blast slag, silica fume, metakaolin and fly ash in concrete to reduce the carbon footprints. This study used the sugar cane bagasse ash (SCBA) and silica fume (SF), a mineral admixture as partial replacements for cement, thereby resulting in the formulation of ternary blended concrete. The replacement of SF was maintained at a constant percentage of 10%, and the percentage of SCBA was varied between 0 and 30%, with an increment of 5%. The concrete cubes were prepared with different proportions of SCBA along with 10% of SF and exposed to elevated temperatures 200, 300, 500 and 700 °C and cooled using two cooling regimes, viz. water and air cooling. It was noticed that SCBA15SF10 TBC replacement of OPC had shown better performance at all temperatures when subjected to both air and water cooling.
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TL;DR: In this article, the effects of elevated temperatures on the physical and mechanical properties of various concrete mixtures prepared by ordinary Portland cement, crushed limestone, and river gravel were investigated and the results indicated that the relative strength of concrete decreased as the exposure temperature increased.
581 citations
TL;DR: In this paper, the effects of bagasse ash (BA) content as partial replacement of cement on physical and mechanical properties of hardened concrete are reported, including compressive strength, splitting tensile strength, water absorption, permeability characteristics, chloride diffusion and resistance to chloride ion penetration.
Abstract: The utilization of waste materials in concrete manufacture provides a satisfactory solution to some of the environmental concerns and problems associated with waste management. Agro wastes such as rice husk ash, wheat straw ash, hazel nutshell and sugarcane bagasse ash are used as pozzolanic materials for the development of blended cements. Few studies have been reported on the use of bagasse ash (BA) as partial cement replacement material in respect of cement mortars. In this study, the effects of BA content as partial replacement of cement on physical and mechanical properties of hardened concrete are reported. The properties of concrete investigated include compressive strength, splitting tensile strength, water absorption, permeability characteristics, chloride diffusion and resistance to chloride ion penetration. The test results indicate that BA is an effective mineral admixture, with 20% as optimal replacement ratio of cement.
563 citations
TL;DR: In this paper, the authors investigated the pozzolanic and filler effects of a residual sugar cane bagasse ash (SCBA) in mortars and found that SCBA may be classified as a pozzolaic material, but its activity depends significantly on its particle size and fineness.
Abstract: Sugar cane bagasse ash (SCBA) is generated as a combustion by-product from boilers of sugar and alcohol factories. Composed mainly of silica, this by-product can be used as a mineral admixture in mortar and concrete. Several studies have shown that the use of SCBA as partial Portland cement replacement can improve some properties of cementitious materials. However, it is not yet clear if these improvements are associated to physical or chemical effects. This work investigates the pozzolanic and filler effects of a residual SCBA in mortars. Initially, the influence of particle size of SCBA on the packing density, pozzolanic activity of SCBA and compressive strength of mortars was analyzed. In addition, the behavior of SCBA was compared to that of an insoluble material of the same packing density. The results indicate that SCBA may be classified as a pozzolanic material, but that its activity depends significantly on its particle size and fineness.
382 citations
TL;DR: In this paper, the isolated contribution of silica fume on the tensile strengths of high performance concrete (HPC) is investigated. But the results indicate that the optimum replacement percentage is not a constant one but depends on the water-cementitious material (w/cm) ratio of the mix.
286 citations
TL;DR: In this paper, the results of the processing of sugar cane bagasse ash (SCBA) under controlled calcination conditions in order to obtain materials with optimum pozzolanic activity were presented.
252 citations