Commercial concrete, especially high-strength and high-performance concrete with large flowability and low water-to-cement ratio, has an excessive loss of slump due to poor adaptability of admixtures and cement during transportation and construction. It not only affects the construction of concrete, construction quality, and even the inability to pump construction, but also will affect the quality of hardened concrete, thus proposed a variety of methods to improve the admixture and cement adaptability to control the concrete slump loss.
1. Development and application of new high performance concrete water reducer
The new type of superplasticizer should have the following characteristics: low alkali content, low dosage, high water reduction rate, large reinforcement effect, good adaptability to cement, no segregation, no bleeding, and can well control the slump of concrete loss.
According to the characteristics of the new type of superplasticizer, and through the molecular design theory, there are two methods for synthesizing the new type of superplasticizer at home and abroad.
One is the synthesis of sulfamate-based superplasticizer. Another is the synthetic process of polycarboxylate superplasticizers.
2. Composite use of admixtures
The method mainly includes: 1 combination use of superplasticizer and retarder or retarder superplasticizer; 2 superplasticizer and air entrainer compound use; 3 superplasticizer and superplasticizer composite use.
3, The method of incorporation of water reducing agent
4, Appropriate sulfur method
5, Properly adjust the concrete mix ratio
Horizon Chemical is professional manufacturer of concrete polycarboxylate superplasticizer and cement grinding aid additives.
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