摘要
以未经处理的原状磷石膏为主要原料制备磷石膏基胶凝材料,通过微观分析及测试其力学性能,考察石灰掺量,水泥、粉煤灰比例及养护制度对磷石膏基胶凝材料力学性能的影响。结果表明:(1)该体系最优配比为磷石膏60%,水泥与粉煤灰比例为1∶4,生石灰4%,水料比0.25,减水剂0.2%;(2)该胶凝体系中磷石膏掺量超过60%后,抗压、抗折强度急剧下降;(3)蒸养制度对磷石膏基胶凝材料性能影响较大,在75℃下蒸汽养护10 h,基体强度增长较快且耐水性较高,28 d抗压强度为30.1 MPa,吸水率为8.5%,软化系数达到0.82。
The phosphogypsum-based cementitious material is prepared by original untreated phosphogypsum. The mechanical property of the prepared material was tested and effects of quicklime, cement/fly ash ratio and curing regimes on the mechanical property were investigated. The results showed that the optimal ratio of the system is 60% for phosphogypsum, mass ratio of cement and fly ash is 1∶4, 4% quicklime,water feed ratio 0.25 and water-reducer 0.2%. Compressive strength and rupture strength declined sharply when the amount of phosphogypsum more than 60% in PFQC system. Steam curing 10 h under 75 ℃ has a greater influence on the compressive strength for the base that 28 d compressive strength is 30.1 MPa, water absorption is 8.5%, softening coefficient is 0.82.
出处
《非金属矿》
CAS
CSCD
北大核心
2015年第4期19-22,共4页
Non-Metallic Mines
基金
国家高技术研究发展计划(863计划)(2011AA06A106)
关键词
磷石膏
胶凝材料
力学性能
软化系数
phosphogypsum
cementitious material
mechanical properties
softening coefficient
作者简介
通讯作者，Tel：13890106639；E-mail：chendeyu@swust．edu．cn。
