What is the impact of the mud content on the performance of the water-reducing agent? The main reason is that the mud in the sand will absorb part of the water-reducing agent, reduce the performance of the water-reducing agent, affect the workability of concrete, and reduce the strength. . The specific requirements depend on the requirements of the project site. If you are producing high-strength concrete above C60, the sand and mud content should not exceed 1%. C60 can be appropriately relaxed to 2%. Any higher will be useless. Because although it can achieve the desired effect, the cost is not cost-effective.
With the continuous expansion of the application field of water-reducing admixtures and the continuous deepening of the research field, it is found that the raw materials of concrete have a very obvious impact on the application performance of water-reducing admixtures. At present, there are few systematic studies on the rules and mechanisms of the influence of concrete raw materials on the application performance of water-reducing agents. In order to better guide the promotion and application of water-reducing agents, there is an urgent need to comprehensively study the influence of concrete raw materials on the application performance of water-reducing agents. Influence rules and mechanisms
With the continuous deepening of the research field of water-reducing admixtures and the continuous expansion of application fields, it is found that the influence of concrete raw materials on the application performance of water-reducing admixtures is very obvious, especially in sand and gravel. The mud content has a significant impact on the performance of the superplasticizer. At present, there are few systematic studies on the rules and mechanisms for improving the anti-mud performance of water-reducing agents. In order to better guide the promotion and application of water-reducing agents, there is an urgent need to propose measures to improve the anti-mud performance of water-reducing agents, and to systematically and comprehensively Study the rules and influencing mechanisms of measures to improve the anti-mud performance of water-reducing agents.
Water-reducing admixture is an indispensable component for preparing high-performance concrete. It is also the main development direction and research hotspot of concrete admixtures. The mud content in sand will have a negative impact on the performance of concrete mixed with water-reducing admixtures. There have been many studies on the effect of mud content on the performance of concrete mixed with water-reducing admixtures, but most of them focus on the workability and mechanical properties of fresh concrete, and the effect of mud content on the properties of concrete with different strength levels prepared with water-reducing admixtures. Comparative studies of the effects are rare. This article studies the effects of different mud contents on the properties of low, medium and high strength concrete mixed with water-reducing admixtures, and explores its influence mechanism, aiming to improve and solve the adverse effects of mud content on concrete mixed with water-reducing agents. Provide theoretical basis and technical support. Using methylalkenyl polyoxyethylene ether (TPEG) as the large monomer, acrylic acid (AA) and sodium methacrylate sulfonate (SMAS) as the small monomers, in the initiator ammonium persulfate (APS) and side chain transfer agent Under the action of mercaptopropionic acid (MPA), a polyether water-reducing agent with good dispersion and slump retention is prepared.
As an important component in high-performance concrete, water-reducing agent has the characteristics of low dosage, high water-reducing rate, strong dispersion, good workability, and molecular structure. It has excellent properties such as strong denaturation and green environmental protection, and has developed rapidly in recent decades. However, experimental research and engineering practice have consistently shown that the mud in the aggregate has a certain negative impact on the water-reducing and dispersion performance of the water-reducing agent, and the various single clay minerals in the mud have a relatively large impact on it. Most of the existing research focuses on the impact of mud from different regions or mud with different particle sizes on the working performance or mechanical properties of concrete mixed with water-reducing admixtures. This article starts from the perspective of clay, focusing on the impact of different clays contained in mud on the dispersion performance of water-reducing agents. It explores the impact mechanism based on the different physical and chemical properties of various clays, and explores the impact of clay on its dispersion performance. The main components; and explained from the perspective of interlayer adsorption, which has a high reference value for the development of additives that can shield the negative effects of mud on water-reducing agents. Montmorillonite, illite, and kaolin were selected, among which montmorillonite and calcium-based montmorillonite and sodium-based montmorillonite were selected as research objects based on the different cations between layers. The fluidity of cement slurry mixed with water-reducing agent from different clays was determined. From the perspective of different clays, the impact of different clays on the dispersion of water-reducing agents was studied. </p
微信扫一扫打赏
