Sulfonated Naphthalene Formaldehyde Water Rudecer In Concrete Admixtures
Naphthalene series superplasticizer (naphthalenesulfonic acid formaldehyde condensate) and some other chemical admixtures play an important role in modern concrete materials and technologies. It can improve the various properties of concrete and promote the development of new concrete technologies. When used together with mineral admixtures (also known as mineral admixtures), it promotes the utilization of industrial by-products (such as ground slag and fly ash) in the cementitious material system, which helps to save resources and protect the environment.
Naphthalene is sulfonated, hydrolyzed, condensed, neutralized, filtered, and spray dried to become a powder product. The production process of naphthalene series superplasticizer is mature and the product performance is stable. On the one hand, the product can be directly used in concrete, and the performance of the water-reducing agent concrete has been mastered by the majority of engineers. The effect of excessive or insufficient mixing on the performance of concrete can also be predicted; on the other hand, the naphthalene-based high-efficiency reduction The water agent has good adaptability with other admixtures and can be widely used as the composition of composite admixtures, such as pumping agents, waterproofing agents, air-entraining water-reducing agents, antifreeze, etc., and its composition may contain naphthalene-based high-efficiency reducing agents. Water agent; Finally, its cost-effectiveness is relatively high and it can be accepted by the engineering community. Therefore, the naphthalene-based superplasticizer has become the mainstream product of my country's superplasticizer, and it has become a widely used variety. Although naphthalene-based superplasticizers have many advantages, they also have some shortcomings, mainly due to their poor effect on the plastic retention performance of concrete. The slump loss of concrete with naphthalene-based superplasticizers over time is even greater than Benchmark concrete; although the water reduction rate is relatively high, it is still difficult to meet the requirements of the concrete with higher water reduction rate requirements, and when used in high-strength and high-performance concrete with low water-binder ratio, the viscosity of the concrete is greater , Is not conducive to construction. In order to comprehensively improve the performance of naphthalene-based superplasticizers, the following methods need to be adopted: add auxiliary admixtures (compounds) to the naphthalene-based superplasticizers to alleviate its shortcomings. On the other hand, the naphthalene-based superplasticizer can be optimized by changing molecular parameters (molecular weight, molecular weight distribution, degree of sulfonation) or replacing part of naphthalene with other compatible monomers to form copolymers.
Zhengzhou, Henan, China