掺红砖微粉地聚物再生混凝土耐久性能研究

In view of the difference in durability of fly ash-slag based geopolymer concrete with different content of red brick powder, the red brick powder was mixed with fly ash and slag. Nine combinations of red brick powder, fly ash and slag were designed. The effects of combinations on the durability of geopolymer concrete were analyzed by carbonation test, chloride ion penetration test and freeze-thaw cycle test. The results show that for carbonation resistance, when the replacement rate of red brick powder-fly ash F is 15 %, the splitting tensile strength after carbonization is increased by 9.71 %, and the performance is increased by 6.23 % when the replacement rate of red brick powder-slag is 5 %. For the resistance to chloride ion permeability, the current value of the specimen is reduced by 32.82 % when F is 20 %, and the current value of the specimen is reduced by 30.07 % when S is 5 %. For frost resistance, when F is 15 %, the strength loss rate is reduced by 2.85 %. The greater the S, the worse the frost resistance. When S is 20 %, the maximum increase is 4.28 %.