摘要
针对低熟料矿渣硅酸盐水泥早期强度低、凝结时间长的问题,研究了外掺外加剂和复合方案对低熟料矿渣硅酸盐水泥凝结时间和抗压强度的影响,并通过Jade软件计算31.5°~32.5°水泥矿物C3S对应的XRD图谱积分面积,用以探讨其促凝早强机理。结果表明:外掺方案中,4%熟石灰外掺时可以提高早期强度和缩短凝结时间,0.03%三乙醇胺可以提高早期强度,0.6%A(早强剂)和0.4%C(促凝剂)复合时其早强促凝效果最为明显。复合方案中,3%半水石膏取代硬石膏时可以缩短凝结时间,但会引起强度降低,在此基础上外掺4%熟石灰可以弥补强度损失,但是早期强度增幅不大。细磨熟料和矿渣粉、3%半水石膏取代硬石膏、外掺4%熟石灰复合时可以较大幅度缩短凝结时间,3d抗压强度提高幅度在17%左右。
The effect of additive and separate grinding on the compressive strength and setting time of low clinker slag Portland cement were studied. The improvement mechanism of early strength and setting time of low clinker slag Portland cement were studied by Jade software. The integration area of C3 S in XRD graph could be calculated by Jade software when the diffraction angle was between 31.5° ~32.5°. The results showed the early strength would be improved and setting time would be shorten while adding 4% lime, and the early strength would be improved while adding 0.03% triethanolamine. The early strength and setting time both have a definite improvement while adding 0.6%A(early-strength admixture) and 0.4%C(coagulation accelerator). The setting time would be shorten, but the early strength would be decreased while adding 3%semi-hydrated gypsum replacing anhydrite. However, it could make up for strength losses with addition of 4% lime,it could significantly shorten setting time and improve early strength by 17%.
出处
《水泥》
CAS
2015年第11期1-5,共5页
Cement
关键词
矿渣水泥
早强
促凝
水化
slag cement
early strength admixture
coagulation accelerator
hydration
