内掺再生砖粉湿拌砂浆制备与力学强度研究

Preparation and Mechanical Strengths Studies of Wet-mixed Mortar Modified with Renewable Brick Powders

结合内掺法,研究了不同胶砂比(B/S)(1∶4、1∶5、1∶6)、不同稠度[(70±10) mm、(90±10) mm、(100～115)mm)情况下,粉煤灰(FA)与再生砖粉(RBP)(掺量20%、30%、40%)对改性再生砂浆(RBFM)28 d抗压强度的影响,探讨了RBP取代水泥的可行性。结果表明,相比FA体系,RBFM的28 d抗压强度均出现不同程度的下降,当B/S为1∶5,RBP掺量为30%,稠度为70 mm时,28 d抗压强度下降幅度最大,达到32.74%,但依然可达M5级砂浆要求,可满足大多数砌筑工程需要。

Combined with the mixed method, pre-mixed mortars(RBFM) were studied under the conditions of same Binder-sand ratio(B/S)(1 ∶4, 1 ∶5, 1 ∶6) and consistency [(70 ±10) mm,(90 ±10) mm,(100 ~115) mm], by replacing(20%,30%, 40%) with fly ash(FA) and renewable brick powder influence of 28 d compressive strength, and the feasibility of cement partially replacing with renewable brick powder on pre-mixed mortar was also discussed. Results show that the recycled brick powder compared with FA, the 28 d strength of RBFM has varying degrees of decline, when B/S is 1∶5, the dosage is 30%, and the consistency is 70 mm, its 28 d compressive strength decreases by 32.74%, but still is above M5 mortar level, which can meet the demands for the majority of masonry engineering.