不同材料改性混凝土的性能研究及现状分析

传统水泥混凝土由于存在抗拉强度低、脆性大、凝结硬化较缓慢、干缩量大等缺点,不能够满足当前实际工程对其力学性能的要求.当前,国内外研究者通过矿物添加剂、聚合物、纤维等材料,对普通混凝土进行改性研究,提高其综合性能,并取得了显著效果.论文从以上三个方面系统总结了国内外对混凝土改性研究的成果,全面分析改性混凝土的改性机理及其对混凝土性能的影响,认为改性材料的选择与材料的经济性、试验工艺、改性效果等有关,聚合物乳液和纤维材料是目前研究最为广泛的材料;对混凝土改性应当重视提高改性材料与骨料之间的粘结力及其在混凝土中的均匀分散度;现有聚合物改性机理模型虽然在不断完善,但还不能完全解释可溶性聚合物对混凝土的改性机理;目前具有巨大前景的石墨烯、石墨烯纤维以及纳米碳纤维材料对混凝土的改性性能有待进行进一步研究.

Research and Analysis on the Performance of Modified Concrete with Different Materials

The traditional cement concrete has the shortcomings such as low tensile strength, large brittleness, slow condensation hardening, large shrinkage, and so on.So it cannot meet the needs of the actual engineering.At present, domestic and foreign researchers have studied the modification of ordinary concrete by mineral additives, polymers, fibers and other materials to improve its comprehensive performance, and achieved remarkable results.The results of concrete modification are systematically summarized from the above three aspects.The modification mechanism of modified concrete and its effect on concrete performance are analyzed comprehensively.It is considered that the choice of modified materials is related to the economy of materials, the test technology, the modification effect, and so on. The polymer emulsion and the fiber material are the most widely studied materials.The concrete modification should pay attention to improve the cohesive force between the modified material and the uniform dispersion of the aggregate in the concrete. Although the existing polymer modification mechanism model is constantly improving, it cannot fully explain the modification mechanism of soluble polymer to concrete.The performance of modified concrete by graphene, graphene fiber and nano carbon fiber materials should to be further studied, which materials have a good prospect of application.