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抗裂剂在海工大体积混凝土中的应用研究
作者：谢彪1，2，徐文1，2，王育江1，2，张坚2，吴玲正3
（1.东南大学，江苏 南京 211103；2.高性能土木工程材料国家重点实验室，江苏 南京 211103；3.深中通道管理中心，广东 中山 528400）
摘要：为防止海工大体积混凝土开裂，导致结构渗水劣化，采用掺抗裂剂的温度场和膨胀历程调控双重调控技术，替代布置冷却水管的控裂方案，进行大体积混凝土裂缝控制。采用低水泥用量、大掺量矿物掺和料的配合比及8%的抗裂剂，抗裂剂具有降低早期水化放热速率、温升阶段膨胀存储预压应力及温降阶段补偿收缩变形的作用，同时混凝土的工作性能、力学性能及耐久性优良。经有限元仿真抗裂风险计算分析，掺抗裂剂混凝土分段浇筑长度20 m内时，开裂风险系数小于0.7，混凝土基本不会开裂，符合设计施工要求。
关键词：海工大体积混凝土；抗裂剂；裂缝控制
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2021）01-0068-04
Research on the application of marine engineering mass concrete with anti-cracking agent
XIE Biao1，2，XU Wen1，2， WANG Yujiang1，2，ZHANG Jian2，WU Lingzheng3
（1.Southeast University，Nanjing 211103，China；2.State Key Laboratory of High Performance Civil Engineering Material，Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China；3.Shen-Zhong Link Administration Center，Zhongshan 528400，China）
Abstract：In order to prevent the cracking of large volume marine concrete，which result in water seepage deterioration of the structure，the double-control technology（temperature field and expansion history control） with anti-cracking agent is used instead of the cooling water pipe to control large volume concrete crack. The mixing ratio is low cement dosage，high content mineral admixture and 8% anti-cracking agent. The anti-cracking agent has the effect of reducing the early hydration heat release rate，the expansion storage pre-compression stress during the temperature rise phase and the compensation for shrinkage deformation during the temperature reduction. At the same time，the work performance，mechanical properties and durability of the concrete are excellent. After the calculation and analysis of cracking risk through finite element simulation，when the length of the anti-cracking concrete is poured within 20 m，the cracking risk value is less than 0.7，and the concrete will not crack，meet design and construction requirements.
Key words：large volume marine concrete，anti-cracking agent，crack control