高强页岩轻集料混凝土的力学性能

目的探索影响高强页岩轻集料混凝土力学性能的主要因素,为制备高强页岩轻集料混凝土提供依据.方法配制高强度页岩轻集料混凝土,并利用微观手段观察页岩轻集料混凝土微观结构特征.选择水胶质量比0.34～0.38、砂率38%和粉煤灰掺入量10%,提前预湿轻集料和选用高强度等级的页岩轻集料.结果配制出28 d抗压强度为55～60 MPa的页岩轻集料混凝土.水胶质量比、砂率、粉煤灰掺入量对轻集料混凝土的抗压强度有着不同程度地影响.页岩轻集料混凝土抗压强度随着水胶质量比减少而增大;合理砂率为38%和最佳的粉煤灰掺量10%.结论轻集料本身的强度对配制高强度等级轻集料混凝土起到非常重要的作用,同时通过预湿轻集料可以有效提高轻集料混凝土的后期强度.

Research on Mechanical Property of High Performance Shale Lightweight Aggregate Concrete

Main factors influencing mechanical properties of shale lightweight aggregate concrete （LWAC） are explored in this paper to provide gist for LWAC. Microscopic measurement technology SEM is used to observe the microstructure characteristics of specimens. The 0.34 -0.38 water-binder ratio, 38% sand ratio and 10% mineral admixtures are selected and the high strength lightweight aggregate is prewetted before used. The LWAC with 28d 55 - 60 MPa compressive strength is produced. The results show that water-binder ratio, mineral admixtures and sand ratio have important influence on the compressive strength of LWAC which increases gradually with the decrease of water-binder ratio. Approporiate sand ratio is 38% and mineral admixtures is 10%. The strength of lightweight aggregate plays an important role in the preparation of LWAC. Meanwhile, the prewetted lightweight aggregate can improve the later strength of LWAC effectively.