摘要
膨胀混凝土设计中只给出混凝土的限制膨胀率,而实际生产中要依据限制膨胀率确定膨胀剂的掺量。本文通过测定不同膨胀剂掺量砂浆的限制膨胀率值,将多次试验数据进行回归处理,最终得到了膨胀剂限制膨胀率与掺量的线性关系y=0.0023x+0.0034。在膨胀剂使用时,可根据混凝土结构设计要求的限制膨胀率或者是不同结构限制膨胀率的要求值,计算出膨胀剂的掺量,通过实际混凝土试拌试验,对计算掺量进行修正,最终确定微膨胀混凝土膨胀剂的实际掺量。本文通过试验证明养护条件对膨胀剂限制膨胀率发展的重要性,最终强调了只有合理的掺量与规范的施工和养护,才能保证膨胀混凝土浇筑使用质量符合要求。
In the design of expansive concrete,only the limited expansion rate of concrete is given,and the amount of expansive agent should be determined according to the limited expansion rate in actual production.In this paper,the limited expansion rate of mortar mixed with different expansion agents is measured,the test data were regressed,and finally the linear relationship between the limited expansion rate of expansive agent and the content,y=0.0023x+0.0034 was obtained.When using the expansion agent,the calculated amount of expansion agent can be calculated according to the percentage of restrained expansion required by the concrete structure design or the required value of the limited expansion rate of different structures.The calculated amount can be corrected through the actual concrete trial mixing test,and finally the actual amount of expansion agent of micro expansion concrete can be determined.The importance of curing conditions for the expansion agent to limit the development of expansion rate through experiments were also explained.Finally it was emphasized that only reasonable dosage,standardized construction and maintenance can ensure the pouring quality of expansion concrete to meet the requirements.
出处
《混凝土世界》
2022年第5期26-28,共3页
China Concrete
关键词
膨胀剂
微膨胀混凝土
限制膨胀率
实际掺量
Expansion agent
micro expansive concrete
percentage of restrained expansion
actual adding content