Experimental Study on the Properties of Autoclave Curing High-Strength Concrete According to CaO/SiO2 Ratio

In this experimental study, tests were conducted to obtain the CaO/SiO2 (C/S) molar ratio that minimizes micropores of hardened concrete. To end, compressive strength, thermogravimetric analysis (TGA), and microporous structure concrete investigated using specimens made with silica fume quartz powder under high-temperature/high-pressure conditions. The yielded following results: (1) highest strength (200 MP) was exhibited in C/S range 0.7–0.9, lower ranges ≤ 0.6 ≥ 0.95; (2) productivity calcium silicate hydrate (C-S-H) tended increase proportion all specimens; (3) microstructure measured mercury intrusion porosimetry (MIP), maximum total porosity calculated be 10%. As increased, decreased, as did pore diameter threshold diameter. Thus, found a major factor affecting autoclave-cured cement optimal mechanical properties 0.8–0.9. However, reactivity varies depending on material used curing conditions employed. Therefore, hydration products obtained need further.