| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for preventing perpetual acid deterioration of the surface of concrete of a concrete building structure, concrete construction structure or concrete product and deposition of dust on the surface of such concrete. SOLUTION: The preparation of a concrete composition used for this method comprises using cement or a powdery material containing admixtures, and also, similar fine aggregate and coarse aggregate to those used in general-purpose concrete, adding water to these materials and mixing them, to prepare the objective concrete composition, wherein: further optionally, in addition to the above materials, a surfactant, a chemical admixture, an expansive admixture, a shrinkage reducing agent, a polymer emulsion, a pigment, a thickener, etc., can be used, as the cement, high-belite portland cement having a 45-60 wt.% belite content in the cement clinker mineral composition is used; and the water/cement weight ratio is adjusted to 40-55 wt.%. The surface of placed concrete with such concrete composition is coated with colloidal silica so that the coating weight of colloidal silica is 5-30 g/m2 expressed in terms of SiO2.</p> |
