The Effect of Calcined Bentonite Clay on the Late-Age Electrical Conductivity of Cement Paste after Wetting and Drying Cycles
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Keywords:Cement Paste, Calcined Bentonite Clay, Electrical Conductivity, Compressive Strength
In recent years, there has been a growing interest in the development of sustainable construction materials and technologies. One promising approach is the use of natural minerals and additives to enhance the properties of cementitious composites. Calcined bentonite clay is a natural pozzolanic material that has been shown to improve the compressive strength and durability of concrete. However, its effect on the electrical conductivity of cement paste is less well understood. This study investigates the effect of calcined bentonite clay on the electrical conductivity of cement paste after wetting and drying cycles. Cement paste samples were prepared with different proportions of calcined bentonite clay substitute (5%, 10%, 15%, 20%, 20%, 25% and 30%). The specimens were then subjected to wetting and drying cycles of 5, 10, 15, and 20 cycles. Electrical conductivity measurements were performed on the specimens after each wetting and drying cycle. The results of the study showed that calcined bentonite clay had a negative effect on the electrical conductivity of cement paste. The electrical conductivity of the specimens decreased with increasing calcined bentonite clay substitution level and with increasing number of wetting and drying cycles. Despite its negative effect on electrical conductivity, calcined bentonite clay was found to improve the compressive strength of cement paste in the long term. This suggests that calcined bentonite clay is a viable mineral additive for improving the durability of concrete, even if it is not suitable for applications where high electrical conductivity is required.
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