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夏季高温时硫铝酸盐水泥-硅酸盐水泥二元体系的早期性能
作者：李超，范树景，杭法付，叶勇
（浙江忠信新型建材股份有限公司 杭州研发分公司，浙江 杭州 310052）
摘要：研究了环境温度为40 ℃时硫铝酸盐水泥-硅酸盐水泥二元体系砂浆早期性能（凝结时间、抗压和抗折强度）的变化规律，指出了早强剂及缓凝剂对砂浆早期宏观性能的调节作用。结果表明，当环境温度为40 ℃时，未掺调凝剂情况下，随着硫铝酸盐水泥掺量的增加，二元体系凝结时间大幅度缩短，小时强度快速增长，抗压强度有所提高，28 d抗折强度呈先提高后降低趋势，在掺量为15%时出现峰值。掺入0.1%~0.3%的缓凝剂时，有效延长了二元体系的凝结时间，延长施工开放时间，但抗折及抗压强度略有损失。复掺缓凝剂和早强剂时，凝结时间控制在合理范围内，二元体系的小时强度和28 d抗折抗压强度都有所提高。
关键词：高温环境；二元体系；早期性能
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2020）12-0060-04
Early performance of sulphoaluminate cement-Portland cement binary system at high temperature in summer
LI Chao，FAN Shujing，HANG Fafu，YE Yong
（Zhejiang Zhongxin New Building Materials Co. Ltd.，Hangzhou R&D Branch，Hangzhou 310052，China）
Abstract：This paper studies the change law of the early performance（setting time，compressive strength and flexural strength）of sulphur aluminate cement-Portland cement mortar early binary system under the environment temperature of 40 ℃，and points out the macro regulation effect of early strength agent and retarder on the properties of mortar at early stage. Results show that when the environment temperature was 40 ℃，under the condition without mixing coagulation agent，with the increase of the sulfate aluminate cement content，the setting time of the binary system was greatly shortened，the hourly strength increased rapidly，and the compressive strength increased. The 28 d flexural strength first increased and then decreased and reached peak at 15%. When 0.1%~0.3% retarders were added，the setting time of the binary system was effectively extended and the opening time of construction was increased. However，the flexural and compressive strength were slightly lost. When the retarders and early strength agents were added at the same time，the setting time was controlled within a reasonable range，and both the hourly strength and 28 d flexural and compressive strength of the binary system were increased.
Key words：high temperature environment，binary system，early performance