Abstract
In this study, the influences of chemical composition and fineness on the development of concrete strength by curing conditions were investigated through performance evaluation of high SO3 Portland cement (HSPC) and ordinary Portland cement (OPC). At the same fineness (3800 cm2/g), the initial and final setting times of HSPC were 92 and 98 min less than OPC. Early mortar compressive strength was approximately 176% higher after 24 h. After curing for 15 h, 18 h, and 24 h, the maturity of HSPC concrete (107.4%, 109.6%, and 111.7%) and early compressive strength (146.4%, 170.7%, and 154.5%) were higher than measured for OPC concrete. HSPC fineness was 111.8% higher than OPC, leading to early activation of the hydration reaction. By X-ray fluorescence analysis, the SO3 content of HSPC was 107.9% that of OPC. The applicable time for HSPC concrete form removal was shorter than that for OPC concrete. The relationships y = −10.57 ln(x) + 47.30 and y = −9.84 ln(x) + 44.05 were estimated for predicting the early-age strength OPC and HSPC concrete. Therefore, applying HSPC concrete to an actual construction site is expected to shorten the construction period and reduce the heating curing cost in winter compared to OPC concrete.
Highlights
Concrete is the most commonly used construction material because of its excellent strength and durability [1,2]
Applying high SO3 Portland cement (HSPC) concrete to an actual construction site is expected to shorten the construction period and reduce the heating curing cost in winter compared to ordinary Portland cement (OPC) concrete
This study evaluated the performance of cement with a higher degree of fineness than ordinary Portland cement (OPC)
Summary
Concrete is the most commonly used construction material because of its excellent strength and durability [1,2]. Thesubstantially degree of hydration of water/binder cement minerals may beand significantly strength This takes place up ability to a point beyond which low to water/binder ratios can lead other reduced. Used to control the hardening time of cement [25], and the mechanical properties (strength, shrinkage, Gypsum may be present in small proportions as anhydrite (CaSO4) but, owing to instability, rarely andthe expansion) of cement change depending on the amount of gypsum in the matrix [26,27]. The new HSPC was evaluated against OPC by setting time early compressive strength according to cement fineness and type in a mortar test (Series I), and slump and air content according to cement fineness and type in a concrete test (Series II). The strength prediction of concrete and the possibility of removing the vertical formwork according to the heat of hydration were applied to the in-place curing of concrete samples in a field test structure
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