碱矿渣再生混凝土是以碱激发胶凝材料替代水泥、再生骨料取代天然石子制备而成的新型混凝土，能有效降低波特兰水泥用量，提高废弃混凝土利用率，但尚未见对其力学性能的相关研究。为研究碱矿渣再生混凝土的基本力学性能，以钢纤维取代率和再生骨料取代率为主要试验参数，进行抗压试验、劈裂抗拉试验和抗折试验。研究结果表明：随着再生粗骨料取代率的增加，碱矿渣再生混凝土的抗压强度f_cu、劈裂抗拉强度f_t和抗折强度f_w均降低，再生粗骨料取代率为100%时的降低幅度分别为30%、10%、15%；碱矿渣再生混凝土抗压强度和劈裂抗拉强度随钢纤维体积取代率增加先提高后降低，钢纤维体积取代率为0.6%时，抗压强度和抗折强度达到最大值；碱矿渣再生混凝土抗折强度随钢纤维体积取代率增加而增加。

Alkali slag recycled concrete is a new type of concrete prepared by replacing cement with alkali excited cementing material and natural stone with recycled aggregate, which can effectively reduce the amount of Portland cement and improve the utilization rate of waste concrete. However, there has been no relevant research on its mechanical properties. In order to study the basic mechanical properties of alkali slag recycled concrete, the compression test, splitting tensile test and flexure test were carried out with the steel fiber replacement rate and the recycled aggregate replacement rate as the main test parameters.The results show that: With the increase of recycled aggregate, the cube strength f_cu, splitting tensile strength f_t and flexural strength f_w of recycled alkali slag concrete all decrease, and the reduction range is 30%, 10% and 15% respectively when the substitution rate of recycled coarse aggregate is 100%. The cube strength and splitting tensile strength of alkali-slag recycled coarse aggregate concrete with increase first and then decrease with the increase of steel fiber volume substitution rate. When the steel fiber volume substitution rate is 0.6%, the compressive strength and flexural strength reach the maximum value. The flexural strength of alkali slag recycled concrete increases with the increase of steel fiber volume substitution rate.

TU528.572

国家自然科学基金（52108132）；河北省自然科学基金（E2021202067）；河北省高等学校科学技术研究项目（QN2021037）