Abstract
This study examines effects of cement fineness and chemical admixtures of early strength agents on the early strength development of concrete. Three cement types were selected, namely ASTM type-I ordinary Portland cement (OPC), fineness ordinary Portland cement (FOPC), and ASTM type-III early Portland cement (EPC), and the mixing proportions of concrete were set by adding a triethanolamine-based chemical admixture to FOPC. The evaluation items considered in this study included raw material analysis, compressive strength, and maturity (D∙h). The time required for the development of concrete strength of 5 MPa in the three cement types was estimated and compared. The results revealed that using FOPC enhances the strength development of concrete owing to its higher fineness and SO3 content compared to OPC. In addition, it has been observed that using both FOPC and TCA yields a similar performance to that observed using EPC, in light of the improved early strength development at low temperatures.
Highlights
Concrete forms a structural matrix by combining cement, water, fine aggregate, coarse aggregate, and admixture
ordinary Portland cement (OPC) has a mean size of 19.46 μm and a fineness modulus of 1.09, while fine ordinary Portland cement (FOPC) has a mean size of 16.31 μm and a fineness modulus of 0.92
early Portland cement (EPC) has a mean size of 14.01 μm and a fineness modulus of 0.76
Summary
Concrete forms a structural matrix by combining cement, water, fine aggregate, coarse aggregate, and admixture. The strength of concrete is developed by the homogeneous bonding force of each material, and the primary influential factor of the strength development is cement. Cement is condensed and cured as it stabilizes while releasing heat energy through its hydration reaction with water [1,2,3]. Concrete features excellent compressive strength development, while facilitating easy attachment of reinforcement bars. The strong alkali performance of concrete ensures durability by limiting the corrosion of reinforcing bars. Concrete is available for purchase and use
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