Polycarboxylic acid water reducing agent is a commonly used cement and concrete water reducing agent, which has the effect of reducing water and slumping. The rational use of polycarboxylic acid water reducer is more effective.1. The water reduction rate fluctuates, which is not easy to control in t
Concrete is an important material used in engineering construction, and has many advantages such as low price and energy saving. But concrete is not a material with perfect technical performance, and the problem of shrinkage cracks is a problem that has not been solved for a long time. There are man
Polycarboxylic acid is a new type of admixture, which has high water reduction rate and high adaptability, can improve the workability of concrete, and improve the workability and quality of concrete construction. Precautions for the use of polycarboxylic acid admixtures for concrete are embodied in
The precautions of polycarboxylic acid water reducing agent mainly include the following six points:1. There is a problem with the adaptability of cement. For some cements, the water reduction rate is low and the slump is large. Therefore, when the cement adaptability is not good, the concrete trial
As a new generation of water reducing agent, polycarboxylic acid water reducing agent is widely used in concrete engineering, but there are still some problems in the process of use that are difficult and difficult to solve. Therefore, some matters should be brought to our attention during use.
In the early 19th century, dispersive admixtures were used. However, in the 1960s, sulphonated melamine formaldehydes and analogous naphthalene derivatives were introduced. Nowadays, new admixtures based on polycarboxylate ethers are being developed. Polycarboxylate ethers possess structural characteristics that provide more fluid concrete, which is more resistant to segregation and exudation as compared to that prepared with the previously known superplasticizers. Polycarboxylate ethers have been commonly utilized to enhance the flow ability of cementitious materials. Moreover, polycarboxylate ether is one of the most effective types of plasticizers, water reducer, and disperser which promotes excellent flow ability, high strength, workability, and pump ability, and efficient dispersion for gypsum, cement, and ceramic materials.
Structure and use of methyl allyl alcohol polyoxyethylene ether (HPEG)
Alkylpropanol is an important organic intermediate used in the synthesis of perfumes, resins and the like. The synthesis of methyl allyl alcohol polyoxyethylene ether (HPEG) from methyl allyl alcohol and ethylene oxide is used for a new generation of high performance concrete water reducer.
A new type of cement grinding aid was synthesized from triisopropanolamine, diethanolamine, acrylic acid, HPEG400 and other raw materials. The effect of grinding aid, physical and mechanical properties and hydration products on titanium slag cement was tested.
Concrete segregation refers to that the amount of the pumping agent exceeds the saturation point of the cementing material, and the resistance between the particles of the cementing material decreases and the displacement accelerates.