耐碱混凝土（Alkali resistant concrete）.docVIP

耐碱混凝土（Alkali resistant concrete） Alkali resistant concrete Concrete with corrosion resistance under alkaline medium. Alkali resistant concrete is used in the metallurgical, chemical and other industrial anti-corrosion structures. It is used for floor, surface and storage tank. 1. raw materials (1) the cement concrete alkali cement should be 325 more than ordinary cement, and three calcium aluminate cement clinker content should not be greater than 9%; or (which is composed by carbonate cement clinker and crushed limestone powder according to 1: 1 mixture), per cubic meter of acid resistant concrete the amount of cement, shall not be less than 300kg, water cement ratio not greater than 0.60. (2) aggregate, coarse aggregate and powder shall be made of alkali and dense limestone (such as limestone, dolomite, marble, etc.), igneous rocks (such as diabase, flowers, rocks, etc.) made of rock. Sand and powder can also be made of ordinary sand of quartz as fine aggregate, and the alkali dissolution rate of coarse aggregate and powder is not more than 1g/L. 2. corrosion resistance and mix ratio The incorporation in the ordinary concrete ferrous or ferric hydroxide has a good effect on improving the alkali resistance. Alkali resistant concrete at 50 DEG C, corrosion resistant concentration of sodium hydroxide and aluminate solution 25%, also resistant to corrosion at any concentration of ammonia, sodium carbonate solution, corrosion resistance and any concentration of ammonia, sodium carbonate and alkaline gas and dust etc.. The mix ratio of alkali resistant concrete is shown in the following table: Mix items (kg/m3) slump (CM) natural curing (day) alkali leaching maintenance (day) compressive strength of N/ (mm) 2 Cement, limestone powder, sand, crushed stone water Dosage; particle size (mm); dosage No. 1425 regular 360-780 5~40 11701785281421 No. 2425 regular 340-740 5~40 11201825242823.8 No. 3200 carbonate 340110600 10~40 1405150228 - 13.7 No. 4525 regular 330-637 5~15 5~4