Used to improve the performance of concrete, industrial waste or mineral fine powder with a certain degree of fineness added in the concrete mixing process, it is an auxiliary cementing material that replaces part of the cement consumption.
To give full play to the pozzolanic activity, morphological water reduction effect and micro-aggregate filling effect of active admixtures and inactive admixtures, and improve the quality and performance of concrete, admixtures must have a finer particle size and larger than cement Specific surface area.
According to a large amount of data and practice, the blockage of pump pipeline is the most common problem in super high-rise structure concrete pumping.
High-strength concrete has a low water-binder ratio and a large amount of cementitious materials, which leads to an increase in hydration temperature, so plastic shrinkage and self-shrinkage. Although high-strength concrete has a higher tensile strength, it has a high elastic modulus, which will cause higher tensile stress under the same shrinkage and deformation, so the risk of cracking in the early stage and during use cannot be ignored.
Mud content refers to the content of fine particles with a particle size of less than 75μm in sand, its mineral composition and chemical composition are different from those of the parent rock, and with relatively strong adsorption.