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- 混凝土与制品
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预制构件用超早强免蒸养混凝土的研制
作者：崔嘉铭1，2，蒋元海1，黄发军1，蓝豪杰1，殷旭峰1，程洪烨1，骆可扬1
（1.嘉兴学院 建筑工程学院，浙江 嘉兴 314001；
2.宁波大学 土木工程与地理环境学院，浙江 宁波 315211）
2.宁波大学 土木工程与地理环境学院，浙江 宁波 315211）
摘要：进行了预制构件用超早强免蒸养混凝土的配合比试验，分析了SBT-510超早强剂、CSP-12早强型高效减水剂以及粉煤灰、矿粉等对混凝土早期强度和工作性能的影响。结果表明：采用0.31水胶比，复掺3.0％的SBT-510超早强剂和1.5％的CSP-12早强型高效减水剂时，能显著提高混凝土的早期强度，在自然养护条件下，混凝土12 h抗压强度最高可达到36 MPa，在11 ℃养护条件下，12 h抗压强度也可达到15 MPa；双掺10％粉煤灰和10％矿粉不但有利于混凝土早期强度的提高，还可改善混凝土工作性能、降低水泥用量。
关键词：预制构件；免蒸养；超早强混凝土；早强剂；高效减水剂
中图分类号：TU528.7 文献标识码：A 文章编号：1001-702X（2022）09-0027-04
Preparation of super-early strength precast concrete without steam curing
CUI Jiaming1，2，JIANG Yuanhai1，HUANG Fajun1，LAN Haojie1，YIN Xufeng1，CHENG Hongye1，LUO Keyang1
（Jiaxing university，College of architecture and engineering，Jiaxing 314001，China；
2.Ningbo university，College of Civil Engineering and Geographical Environment，Ningbo 315211，China）
Abstract：This paper studies the mix proportion of super-early strength precast concrete without steam curing. The effects of SBT-510 super early strength agent，CSP-12 polycarboxylate superplasticizer，fly ash and slag on the early strength and workability of concrete are analyzed. The experimental results show that when the water-binder ratio is 0.31，the early strength of concrete can be improved by adding 3.0% SBT-510 early strength agent and 1.5% CSP-12 polycarboxylate superplasticizer，under the condition of natural curing，the 12 h compressive strength of concrete can reach 36 MPa，and when curing under the condition of 11 ℃，the 12 h compressive strength of concrete can reach 15 MPa. The two-component compound admixtures with the content of fly ash and slag powder being 10% of the quality of cementitious materials can not only improve the early strength of concrete，but also improve the workability of concrete and reduce the quantity of cement.
Key words：precast member，no steaming，super early strength concrete，early strengthening agent，polycarboxylate superplasticizer