concrete anti-crack, dense and waterproof agent formula concrete shrinkage-resistant, crack-resistant, water-reducing, waterproof and dense agent formula
concrete, as a cheap material, is often used in coal mine tunnel construction projects. combined with the different geological conditions and construction techniques of tunnel construction, concrete should meet the following characteristics ：(1) the well wall constructed by the common method and the inner well wall constructed by the freezing method are the main structure…
