Admixtures and cement are indispensable in the construction industry, but sometimes they always have small contradictions and ranks one another. What is the reason for them to rank and how can they adapt to each other? 3-mercaptopropionic acid A new type of cement admixture - the development and use of polycarboxylate superplasticizers. 3-mercaptopropionic acid is mainly used in the production of polycarboxylate superplasticizers to control molecular weight, high performance mediator , greatly improving the water reduction rate and moisture retention performance of concrete.
The main problem of the two of them is that the admixture is incorporated into the concrete at the prescribed dosage, which does not produce the desired effect or effect, so that the concrete fluidity is reduced or the fluidity is increased over time: when the admixture is excessively mixed, although The fluidity of the concrete becomes better, but abnormal phenomena such as segregation, bleeding and squashing appear, which not only ensures the uniformity of the concrete, but also causes the engineering quality problems such as plastic shrinkage cracking of the hardened concrete.
In order to improve the adaptability of concrete admixtures and cement, the following measures can be taken to improve the adaptability of concrete admixtures and cement:
(1) Advocate for concrete raw material producers, concrete mix preparers and construction technicians. Only when the whole society recognizes the existence of adaptation between cement and admixtures can it correctly face its possible consequences and encourage people to work hard to solve this problem.
(2) Concrete preparers shall conduct quality inspection and concrete test-matching tests for each batch of cement and each batch of admixtures, seek technical characteristics of raw materials, and use admixtures with good adaptability as much as possible to avoid the use of cement. Quality accidents, material waste or cost increases caused by incompatible cement and admixtures.
(3) The cost of preparing concrete is important, but concrete preparers cannot focus on saving costs and ignoring certain cements (such as those with relatively high aluminate content) or cements with certain admixtures. The actual demand for the amount of concrete admixture. This is because the appropriate amount of admixture is related to factors such as cement properties, admixture properties and dosage, rather than a fixed value in the conventional concept.
(4) Cement plants, admixture plants and concrete preparation units should work together to solve such problems, and must not cover up and shirk their responsibility for the technical problems they have. For example, cement plants should try not to use anhydrite as a coagulant: when the admixture plant encounters cement used in combination with anhydrite cement, it should provide admixture without wood calcium or calcium calcium or take other technical measures: concrete The preparer should adopt the recommendations of the admixture plant to change the variety and dosage of the admixture in a timely manner.