Influencing factors of concrete slump retention - Mineral Admixtures And Aggregate

Influencing factors of concrete slump loss - Mineral Admixtures

In order to improve the performance of concrete and reduce the cost of concrete, mineral admixtures are often added to concrete in the process of concrete preparation. Mineral admixtures improve the cement particle size distribution, thus reducing the water demand, which is conducive to improving the fluidity of concrete. At the same time, the reaction of mineral admixture is potential hydration reaction and pozzolanic effect, which reduces the water consumption of cement in the initial hydration stage, and is also conducive to improving the fluidity of concrete. However, when the carbon content of fly ash exceeds 5%, the slump of concrete decreases and the slump loss of concrete increases due to the adsorption of carbon to water and additives.

Influencing factors of concrete slump loss - aggregate

In ordinary concrete, aggregate volume accounts for more than 60%. Aggregate is an important component of concrete to withstand load, resist erosion and enhance the volume stability of concrete. Therefore, the performance of aggregate has a direct impact on the performance of concrete mixtures. If the aggregate used in concrete mixing is dry and the water absorption rate of aggregate is high, it will absorb a large amount of water in concrete, which will reduce the free water and cause the slump of concrete mixtures to become smaller, that is, the slump loss will increase. If aggregate gradation is not good, it will result in poor workability of mixtures, easy to produce bleeding segregation and other problems; if aggregate is too fine, it will increase the specific surface area, will increase the absorption of water, so under the same water consumption, the slump of concrete will become smaller.

Choose the right concrete admixtures can improve the concrete workability and durability.

Shijiazhuang City Horizon Chemical Industry Co., Ltd. can provide concrete polycarboxylate superplasticizer and other additives used together with the concrete water reducer, like concrete retarder, defoamer, and accelerator, etc.