concrete admixture

The soluble alkali in cement is usually expressed as Na2O equivalent, mainly from the clay and admixtures used to produce cement. The right amount of soluble alkali is beneficial to promote cement hydration and the early strength development of concrete. Experiments have shown that the fluidity of cement concrete increases…

Concrete has fluidity because the paste comprises glue, fine aggregate, and water wrapped on the stone’s surface. The paste can act as a “lubricant” to wrap the stone to form a flowable dynamic equilibrium whole. The good fluidity of concrete requires good fluidity of the paste itself on the one…

Our project, which involved the production of interlocking piles with a concrete initial setting time of 40-70 hours, initially seemed straightforward. However, we encountered some unexpected deviations during the test. While the initial setting time of concrete generally varies with temperature, the differences are usually manageable. Yet, when we extended…

1. Dispersion effect The particles attract each other to form a flocculation structure after the cement is stirred with water. This flocculation structure will wrap 10%-30% of water between cement particles, so these water molecules cannot flow freely and play a lubricating role. The flocculation phenomenon of cement will affect…

The slow-release polycarboxylic acid water-reducing agent controls the dispersion process of cement particles by chemical means so that the water-reducing agent molecules have the function of continuously dispersing cement particles and slowly adsorbing on the surface of cement particles within a certain period. According to the release principle, the slow-release…

As one of the primary materials for concrete, sea sand is characterized by low-quality requirements and low added value, but the total demand is enormous. River sand is the primary source of construction sand, but the supply of river sand is limited by factors such as resources and environmental impacts…

Reasons 1. High temperature and high amount of cementitious materials With global warming, summer temperatures are generally higher than in previous years. The ultra-high temperature accelerates water evaporation in the concrete, especially the high-strength concrete, which has a low water-cement ratio. The evaporation of water accelerates the coagulation of the…

Compared with naphthalene-based water reducers, polycarboxylate water reducers are relatively sensitive to cement and sand materials, but their workability can be improved by adding small materials. In the following sections, I will present some practical water retaining agents and methods to increase workability. Each material has an upper limit for…

“Sand” is a natural particle gradation with no mud, dirt, or debris restrictions. It is a general name. “Sand” means soil that can be used as a building material and has specific quality requirements. For example, highly weathered granite particles cannot be called “sand” even though they are very similar.…

There are many directions for changing the mother liquor process, such as temperature, redox agent, chain transfer agent, stirring and dropping time, acid-to-ether ratio, acid feeding method, and reactor bottom material concentration. In my personal experience, the acid-to-ether ratio and the acid-feeding method have the most significant impact or make…