庞安宇,刘向坤*,张 伟
庞安宇,刘向坤,张伟.西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究[J].混凝土与水泥制品,2024(10):40-43,48.
PANG A Y,LIU X K,ZHANG W.Study on high durability fiber reinforced concrete technology in strong corrosion environment in Northwest China[J].China Concrete and Cement Products,2024(10):40-43,48.
西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究
庞安宇,刘向坤*,张 伟
庞安宇,刘向坤,张伟.西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究[J].混凝土与水泥制品,2024(10):40-43,48.
PANG A Y,LIU X K,ZHANG W.Study on high durability fiber reinforced concrete technology in strong corrosion environment in Northwest China[J].China Concrete and Cement Products,2024(10):40-43,48.
摘 要:针对西北地区核电工程恶劣环境,采用镁质抗蚀增强剂、水化热抑制剂、高性能复合矿物掺合料等制备了聚丙烯纤维增强C40高性能混凝土,研究了镁质抗蚀增强剂和水化热抑制剂对混凝土的工作性、力学性能和耐久性能的影响,并基于试验结果对纤维的最佳掺量进行了优选。结果表明:掺加水化热抑制剂和镁质抗蚀增强剂的混凝土具有良好的工作性,掺入不同掺量的纤维,混凝土的出机坍落度仍保持在160 mm以上,含气量在2.7%~4.2%之间;掺加水化热抑制剂和镁质抗蚀增强剂,混凝土的3 d抗压强度降低,7 d、28 d抗压强度提高,而随着纤维掺量的增加,混凝土的抗压强度提高;水化热抑制剂和镁质抗蚀增强剂的掺入可有效提高混凝土的抗氯离子渗透性能,掺入适量纤维可显著提高混凝土的抗氯离子渗透性能;水化热抑制剂和镁质抗蚀增强剂的掺入可提高混凝土的抗硫酸盐侵蚀性能,适量纤维的掺入也可提高混凝土的抗硫酸盐侵蚀性能;综合考虑工作性、力学性能和耐久性能,纤维推荐掺量为1.0 kg/m3。
Abstract: In response to the harsh environment of nuclear power projects in the northwest region, polypropylene fiber reinforced C40 high performance concrete was prepared using magnesium based corrosion inhibitors, hydration heat inhibitors, high-performance composite mineral admixtures, etc. The effects of magnesium based corrosion inhibitors and hydration heat inhibitors on the workability, mechanical properties, and durability of concrete were studied, and the optimal fiber content was selected based on experimental results. The results show that the concrete with hydration heat inhibitor and magnesium corrosion inhibitor has good workability. When different contents of fibers are added, the slump of the concrete remains above 160 mm and the air content is between 2.7% and 4.2%. The addition of hydration heat inhibitor and magnesium based corrosion inhibitor reduces the compressive strength of concrete at 3 d, increases the compressive strength at 7 d and 28 d. With the increase of fiber content, the compressive strength of concrete increases. The addition of hydration heat inhibitors and magnesium based corrosion inhibitors can effectively improve the chloride ion penetration resistance of concrete, and the addition of appropriate contents of fibers can significantly enhance the chloride ion penetration resistance of concrete. The addition of hydration heat inhibitors and magnesium based corrosion inhibitors can improve the sulfate resistance of concrete, and the addition of appropriate contents of fibers can also enhance the sulfate resistance of concrete. Taking into account workability, mechanical properties, and durability, the recommended fiber content is 1.0 kg/m3.
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