为了解决碱矿渣胶凝材料收缩过大限制其应用的问题,将陶粒和陶砂掺入碱矿渣胶凝材料中形成碱矿渣陶粒混凝土.完成了252个碱矿渣陶粒混凝土试件的试验,考虑了水灰比、砂率、粉煤灰质量分数、水玻璃模数、氧化钠质量分数等关键参数对碱矿渣陶粒混凝土抗压强度和干缩率的影响.试验结果表明,碱矿渣陶粒混凝土的28 d边长为100 mm立方体的抗压强度为45~55 MPa,碱矿渣陶粒混凝土的28 d干燥收缩率为1.8×10-4~4.4×10-4.当水灰比、粉煤灰质量分数、水玻璃模数、氧化钠质量分数增大时,抗压强度减小,干缩率增大;砂率增大时,抗压强度增大,干缩率减小.
In order to solve the problem of big shrinkage which restricted the application of alkali-activated slag binding material, the ceramsite and ceramic sand can be mixed with the alkali-activated slag binding material and formed the alkali-activated slag ceramsite concrete, the shrinkage can be effectively reduced. The experiments of 252 alkali-activated slag ceramsite concrete specimens were completed, and five parameters were changed including the water cement ratio, sand ratio, the fraction of fly ash, the modulus of sodium silicate, the fraction of sodium oxide, the change rules of cube compressive strength and prism dry shrinkage with these parameters of alkali-activated slag ceramsite concrete were obtained. The cube compressive strength of alkali-activated slag ceramsite concrete was 45-55 MPa, which the side length was 100 mm, the drying shrinkage rate of alkali-activated slag ceramsite concrete was 1. 8 × 10 -4 -4. 4 × 10 -4 . The research results show that the cube compressive strength decreases, drying shrinkage rate increases with the water cement ratio, the fraction of fly ash, the modulus of sodium silicate, the fraction of sodium oxide increasing; the cube compressive strength increases, drying shrinkage rate decreases with sand ratio increasing.