About concrete admixture polycarboxylate superplasticizer
The polycarboxylate superplasticizer is a high -performance water reduction agent, a cement distributed agent in the use of cement concrete. It is widely used in projects such as highways, bridges, dams, tunnels, and skyscrapers.
This product is green, environmentally friendly, flammable, not explosive, and can safely use trains and car transportation.
According to the difference in the main chain structure, the efficient water -cutting product of the polycalbonate system is one category that contains acrylic or methyl acrylic acid as the main chain, and the length of a different side chain polyethel 2. It can be classified into one category. The other type is a polyethel with a different side chain length based on anhydrous malayic acid. Based on this, a series of high -quality water reduction products with different characteristics are derived.
Before polycarboxylic acid outer agent occurs, there are outer amucin sulfonate, sulfonate formaldehyde compounds, melamine formaldehyde shrimp, alnatal sulfonin formaldehyde contraction, amino sulfonin formaldehyde compounds, etc. In the early 1980s, Japan took the lead in successfully developing a polycarboxylic acid water reduction agent. The high -efficiency water reducing agent of a new generation of polycarboxylic acid has overcome some disadvantages of traditional water reducing agents. It has the potential to be low -volume, good collapse performance, low concrete contraction rate, strong molecular structure, high performance, large performance, production of production, production In the process, there are no outstanding advantages such as formaldehyde.
In many concrete engineering, traditional high -efficiency concrete such as the 土 system has become increasingly unable to meet engineering needs due to the limitations of technical performance. The new generation of water reduction agent that has attracted much attention at home and abroad, a high -performance water reduction agent at polycarboxylic acid system, has really designed an effective molecular structure based on the mechanism of decentralized cement. It does not cause significant slowing, and play a higher plasticization effect under low doping. The liquidity remains good, the cement adapts to the large -scale freedom of the wide molecular structure, the altitude is large, and the high performance is large. The effect is significant, can reduce the technical characteristics of concrete contraction, extremely low harmful material content, etc., which gives the concrete excellent construction and easy development, good strength development, excellent durability, and high -performance water reduction agent of polycarboxylic acid system. Comprehensive technical performance advantages and environmental protection characteristics meet the needs of modern concrete engineering. Therefore, the high -performance water reducing agent of polycarboxylic acid system is gradually becoming the preferred external agent for preparation of high -performance concrete. According to reports, the amount of exterior doses of polycarboxylic acid in Japan has accounted for more than 80%of all high -performance exterior products, and North America and Europe also account for more than 50%. In our country, the water carboxylic acid water reduction agent has been successfully applied to large water conservancy, bridges, nuclear power, and railway projects such as the Three Gorges Dam, Sutong Bridge, Tianwan Nuclear Power Station, and Beijing -Shanghai high -speed rail, and achieved remarkable results.
At the same time, there are also some problems with polycarboxylic acid water reducing agents: 1. Insufficient collapse in high temperature environment; 2. Strong temperature sensitivity, the same type of polycar carboxylic acid reduction agent in different seasons, concrete collapse is far from the difference; 3. There are fewer functional products, and it is difficult to meet the requirements of ultra -high, long -distance concrete pumping, negative temperature construction, preparation of ultra -early strong concrete, and high durability of concrete; In the formulation of concrete, water glue has high viscosity and is not conducive to construction. 6. Poor adaptation to mechanism sand, and the sensitivity to the construction.
- Good compatibility with various cement, the slump of concrete maintains good performance, and extend the construction time of concrete.
- Low doping, high water reduction rate, and shrinking.
- greatly improve the early and late intensity of concrete.
- The low chloride content and low alkali content of this product are conducive to the durability of concrete.
- The production process of this product is not polluted and does not contain formaldehyde. It meets the international standards of ISO14000 environmental protection management and is a green environmental protection product.
- Use polycarboxylic acid water reducing agent, more slag or flour ash can be used to replace cement to reduce costs.
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