The concrete that oozes out, the surface part moisture is more, the actual water ash is higher, therefore the strength is lower. If concrete is continuously poured on the columns, the top layer of the bleed gauge should be cut off to avoid a weak layer between the old and new concrete.
"Concrete 'thickening and thinning" is called "workability" or "concrete, workability", and "slump" is usually used to determine. The higher the slump, the thinner the concrete, the better the workability, the easier the vibration and compaction. However, decline does not indicate whether concrete is susceptible to bleeding. polycarboxylate superplasticizer water retention performance is poor, easy to bleed, which is mainly related to concrete water cement ratio, cement admixture, fineness and water retention ability, chemical admixture performance.
polycarboxylate superplasticizer is a new production mode of water reducer which has attracted wide attention in recent years. It has the advantages of short reaction time, high monomer conversion, low product-transportation cost and wide application range. With the continuous optimization of bulk polymerization process and the improvement of product pulverizing process, polycarboxylate superplasticizer will be widely used.
