镁质水泥轻质海水混凝土力学性能研究

Study on Mechanical Properties of Magnesia Cement Lightweight Seawater Concrete

摘要: 本文提出了一种以四元体系镁质碱式盐水泥为胶凝材料、珊瑚为骨料、海水为拌和用水的新型混凝土及一套较为合理的配合比设计方法。通过测定抗压、抗折、劈拉强度等指标，对混凝土的力学性能进行探究。同时，为获得高性能的混凝土，从浆骨比、骨料、养护条件和改性方面展开研究。结果表明，混凝土性能优良，配合比计算方法可行。骨料对混凝土强度的影响占据主导地位，为获得高强混凝土必须从骨料方面入手。养护温度的提高对混凝土的韧性具有明显的提升作用。加入改性剂后，能够有效保证提高混凝土的软化系数，满足在海水浸泡条件下的应用要求。

Abstract: In this paper, a new type of concrete with magnesia salt cement of quaternion system as cementi-tious material, coral as aggregate and sea water as mixing water is proposed, as well as the opti-mized design method. The mechanical properties, such as the compressive strength, flexural and splitting tensile strength, are studied. In order to obtain high-performance concrete, the relation-ships between the mechanical properties and the paste to aggregate ratio, aggregate property, curing condition and the addition of modifier are investigated. The results show that the influence of aggregate on strength is dominant. A higher curing temperature has noticeable effect on the toughness of the concrete. The modifier can guarantee the properties of concrete in seawater re-markably.