Na2SO4激发低水胶比粉煤灰-水泥砂浆力学性能研究
Bulletin of the Chinese Ceramic Society(2019)
Abstract
固定水胶比为0.24,通过I级粉煤灰替代砂浆中30% ~70%水泥的强度试验,研究了Na2 SO4对粉煤灰-水泥砂浆体系的激发效果.结果表明:不掺激发剂时,砂浆抗压和抗折强度随粉煤灰替代率的增加成比例下降,且粉煤灰替代率达50%以上时对强度增长速率有显著提升作用.粉煤灰替代率不低于50%时,1%的Na2 SO4掺量对砂浆抗压强度增进效果最佳,与此不同的是,Na2 SO4掺量越高,对砂浆抗折强度的增长越有利.随龄期增长,Na2 SO4激发粉煤灰-水泥砂浆的折压比显著下降,但抗折强度均在5.0 MPa以上.
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