欧美一级婬片人妻欧美大片人,91精品国久久久久久无码,国产99久久久国产精品成人免费,揄拍成人国产精品视频,亚洲一级电影,国产精品69毛片高清亚洲,国产精品毛片一区视频播,国产老熟女精品一区熟女Av,国产又爽又黄无码无遮挡在线观看

PCA ? -IV is a new generation superplasticizer with a base of modified Polycarboxylic ether. It offers maximal water reduction, increased early strength, and enhanced finishing characteristics. PCA ? -IV contains no formaldehyde, calcium chloride or other purposely added chlorides and will not initiate or encourage the corrosion of the steel present in the concrete. It is formulated to comply with the subsequent specifications for concrete admixture: ASTM494, Type F; BS EN934:2/3.2.3.