使用防水外加剂改善混凝土性能

M. Shoya, S. Sugita, Y. Tsukinaga, M. Aba, M. Ohba
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引用次数: 2

摘要

近年来,特别是在日本,开发了各种类型的化学外加剂,重点是制造高耐久性混凝土和开发高流动性的混凝土,以节省劳动力。本文对一种含有高活性硅粉的拒水外加剂(WRP)进行了试验,以确定其对混凝土各项性能的影响。这个概念不仅是为了防止水渗透,由于硅氧烷化合物提供的拒水性,而且还补偿阻碍水化,由于其吸附到水泥颗粒使用高活性火山灰材料。结果表明,该掺合料在降低透水性的同时,其力学性能几乎不受WRP掺量的影响。从碳化、干燥收缩率、抗冻融性能和气孔系统试验中,证实了WRP的效果是令人满意的。
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Use of a Water-Repellent Admixture to Improve Concrete Performance
In recent years, especially in Japan, various types of chemical admixtures have been developed, with emphasis on making highly durable concrete and on developing the highly flowable concrete for labor-saving. In this paper, one kind of water-repellent admixture incorporating highly reactive silica powder, denoted as WRP, was examined to confirm its effect on various concrete properties. The concept is not only to prevent water penetration due to water repellency provided by the siloxane compound but also to compensate for the hindered hydration due to its adsorption to cement particles by the use of the highly reactive pozzolanic material. The efficacy of the admixture was confirmed as to its ability reducing the water permeability with little lowering of mechanical properties dependent on the dosage of WRP. From the tests for carbonation, drying shrinkage, resistance to freezing and thawing and the air-void systems, the effect of WRP was confirmed as satisfactory for those properties.
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