滨海环境下清水防腐蚀混凝土配制技术

通过改变原材料种类、胶凝材料总量、水胶比、矿物掺合料用量和比例以及模板体系等因素,探索混凝土抗压强度、抗氯离子渗透性以及外观质量的变化规律。水胶比为0.34~0.38,胶凝材料用量不小于420 kg/m3,以1∶2比例掺入30%~60%的粉煤灰与矿粉,掺入20%以下的超细石灰石粉,同时运用消泡剂与引气剂对聚羧酸减水剂加以改进,严格控制原材料性能指标,并在钢模板中涂覆聚氨酯模板漆,可制备出强度等级大于C40,56 d氯离子迁移系数小于3.0×10-12m2/s,外观质量满足JGJ 169—2009《清水混凝土应用技术规程》的清水防腐蚀混凝土。

Preparation technology of anticorrosive fair-faced concrete in littoral environment

The species of raw material,gel material content,water-binder ratio,amount and ratio of mineral admixture,and selection of formwork system are changed to explore the change law of the concrete′s compressive strength,resistance to chloride ion permeability,and appearance quality.With a water-cement ratio ranging from 0.34 to 0.38,cementitious material greater than or equal to 420 kg/m3,mix with 30% to 60% of fly ash and slag in the ratio of 1∶2,mix with 20% of the super-fine limestone powder,as well as the use of defoamer and air-entraining agents,we may improve the polycarboxylate superplasticizer.Under the strict control of the quality of raw materials,and painting polyurethane template paint,we can make anticorrosive fair-faced concrete with a strength of greater than C40,56 d chloride ion diffusion coefficient of less than 3.0 × 10-12 m2/s,and the appearance meeting the JGJ 169—2009"Technical regulations for application of fair-faced concrete".