- 目录
- 化学建材
- 首页
无碱液体速凝剂对低温下硅酸盐水泥水化及性能
作者：田琨，陈凯，庄连蕊，商先鹏，李成锴，高荣龙
（中建八局第一建设有限公司，山东 济南 250001）
摘要：研究了5、10、15 ℃养护温度下速凝剂聚合硫酸铝对硅酸盐水泥水化和性能的影响，结果表明，当养护温度和聚合硫酸铝掺量分别为5 ℃、7.5%，10 ℃、6.0%，15 ℃、4.5%时，水泥的初凝和终凝时间分别为5、10 min，3、7 min，3、7 min，符合JC 477—2005《喷射混凝土用速凝剂》对凝结时间的要求。速凝剂聚合硫酸铝可促进水泥中铝酸三钙和硅酸三钙矿物在5、10、15 ℃养护时的水化，从而提高了硅酸盐水泥在水化硬化1 d时的抗压强度。低温条件下养护时，速凝剂聚合硫酸铝使水泥砂浆28 d的孔隙率增大，导致水泥砂浆的28 d抗压强度小幅降低。
关键词：速凝剂；无碱；低温；性能
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2018）12-0072-04
Influence of alkali-free liquid quick-setting agent on the hydration and properties of Portland cement at low temperature
TIAN Kun，CHEN Kai，ZHUANG Lianrui，SHANG Xianpeng，LI Chengkai，GAO Ronglong
（China Construction Eighth Bureau First Construction Co. Ltd.，Jinan 250001，China）
Abstract：The effects of accelerator-polyaluminium sulfate on the hydration and properties of Portland cement at 3 different curing temperatures of 5 ℃，10 ℃ and 15 ℃ were studied. The results demonstrate that when the curing temperature and the amount of polyaluminum sulfate were 5 ℃，7.5%，10 ℃，6.0%，15 ℃，4.5%，the initial setting and final setting time of cement reached 5 min and 10 min，3 min and 7 min，3 min and 7 min，respectively，in line with the requirements on setting time as specified in JC 477—2005 "Quick setting agent for shotcrete". Polyaluminium sulfate could promote the hydration of C3A and C3S in the curing temperatures of 5 ℃，10 ℃ and 15 ℃，which improves the compressive strength of Portland cement in the hydration hardening of 1 d. When curing under low temperature conditions，polyaluminium sulfate increases the porosity of the cement mortar，which lowers down the 28 d compressive strength of the cement mortar slightly.
Key words：quick-setting agent，alkali-free，low temperature，properties