矿用高水材料的组分对其性能与微结构的影响

通过实验综合研究高水速凝材料各组分对其工作性能和固结体抗压强度的影响,并利用XRD与SEM研究了材料的微结构.研究证明:硫铝酸盐熟料浆(A组分)的悬浮性不如石膏与石灰(B组分)混合浆,所需悬浮剂也更多;B组分中石膏掺量在80%～85%范围内,高水速凝材料各龄期强度稳定在较高的平台.缓凝剂的加量为1.8%时A组分的凝结时间可达24h;速凝剂加量为A组分的0.050%～0.300%时,试块各龄期的同龄期强度比较稳定;水灰比为3.0时,掺入0.100%的速凝剂,试块7d的强度最高,达3.19MPa.高水材料由柱状钙矾石网络状连接而成,且含水量越高,钙矾石晶体越细小.

Effect of composition on the performance and microstructures of mining high- water solidified materials

Experiments were applied to research the effects of the components of the high - water rapid solidified materials on the workability and the compressive strength. It is proved that the suspension property of sulphoaluminate cement clinker（ component A） is poorer than that of the mixture of Anhydrite and lime（ component B ） and the former consumes more content of suspending agent. The compressive strength of the high - water rapid solidified materials at different age keeps quite high when the content of Anhydrite in component B is between 80% and 85%, and the solidification time reaches to 24 h when the content of retarder is 1.8%. When the content of accelerators is between 0. 050% to 0.300% of sulphoaluminate cement clinker, there are few differences among the same age compressive strength at different age. 0. 100% content of accelerators leads to the highest 7 d compressive strength 3.19 MPa when water cement ratio is 3.0. The high - water quick solidified materials are made up of columnar ettringite which connect into net, and the higher water cement ratio leads to more slender ettringite.