碱渣用作砂浆保水剂的试验研究

发布时间：2019-07-03 13:17

【摘要】：碱渣是氨碱法制纯碱排出的废渣,其堆存和排放造成严重的环境问题。通过对原状碱渣采取工艺处理得到较低氯离子含量的水洗碱渣和除氯碱渣,研究了原状碱渣、水洗碱渣、除氯碱渣应用于砂浆时对其性能的影响及除氯碱渣用作砂浆保水剂的可行性。结果表明,各类碱渣取代15%粉煤灰均有利于提高砂浆的保水性,但原状碱渣及水洗一次碱渣掺入砂浆后氯离子溶出含量偏高,可能造成耐久性问题;而除氯碱渣不会有耐久性问题,可以作为砂浆保水剂。除氯碱渣用作砂浆保水剂使用时,砂浆具有良好的保水性能、力学性能和较低的干缩值。其较佳的应用方式为:碱渣取代胶凝材料中的部分粉煤灰,在不改变水胶比的前提下,加入减水剂来调节砂浆稠度,无需复合有机保水剂。
[Abstract]:Alkali residue is the waste residue discharged from pure alkali by ammonia-alkali method, and its storage and discharge cause serious environmental problems. The water washing alkali slag and chlor alkali slag with low chlorine ion content were obtained by technological treatment of the original alkali slag. The effects of the original alkali slag, the washing alkali slag, the application of the chlor alkali slag on the properties of the mortar and the feasibility of removing the chlor alkali slag as the water retaining agent of the mortar were studied. The results show that the replacement of 15% fly ash with all kinds of alkali slag is beneficial to improve the water retention of mortar, but the chlorine ion dissolution content of original alkali slag and washing alkali slag is too high, which may lead to durability problem, but the removal of chlor-alkali slag will not have durability problem and can be used as mortar water retaining agent. When chlor-alkali slag is used as water retaining agent of mortar, mortar has good water retention performance, mechanical properties and low dry shrinkage value. The better application method is that alkali slag replaces some fly ash in cementitious material, and without changing the ratio of water to glue, adding water reducer to adjust the consistency of mortar does not need compound organic water retaining agent.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金(51208210)
【分类号】：TU578.1

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