混凝土的常用知识（Common knowledge of concrete）.doc

混凝土的常用知识（Common knowledge of concrete） General knowledge of concrete 2009-05-31 16:42 The concrete water cement ratio and water cement ratio Water cement ratio refers to the water to cement ratio Water refers to water cement ratio and cement and other admixture (such as fly ash) and the ratio of Concrete water cement ratio in the range of what? It depends on the strength of concrete and cement label set, generally in 0.4 - 0.6 Know the concrete water cement ratio is 0.45, that the slump is 50~~70MM, it can know the Water? Why? As long as you know the maximum diameter of aggregate for stone, you can know the use of water. For example, if the gravel is the maximum diameter is 40mm, the slump is 50~~70MM, while coagulation The soil water consumption per cubic meter is 185 kg. This is without calculation, a special table, called for concrete content selection table, table draw. Performance density is 2400kg/m3, the dosage of cement 300kg/m3, water cement ratio is 0.6, sand rate 35%, mixed computing Concrete mixing ratio With the amount of cement can be multiplied by 0.6 the amount of water, According to the formula: cement + water + sand + stones =2400, (sand + sand / gravel) =35% The above equations can be used respectively. The concrete slump is 0mm when the water cement ratio is how much? Preparation of dry concrete, demand slump from 0 to 30mm, but we want to practice For collapsbillity is zero, I checked all the information, did not have the relevant reference value. We use 32.5R cement. Check some information, lock the water cement ratio range, and then to test many times, because of the material. The material is not different, do not test. Chinese online journal will have a few relevant papers. Effect of water cement ratio of concrete Add: the dosage of cement, aggregate amount unchanged, the increase of water cement ratio, cement slurry itself The mixing flow increased, the fluidity of the increase, conversely, decreases. However, the water cement ratio is too l