Abstract:
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.