{0><}0{>Retarding and water reducing agent and preparation method thereof

Abstract

The invention discloses a retarded water reducer and a preparation method thereof, wherein the retarded water reducer comprises the following components in mass percentage: 6-14% of a water reducer, 1-4% of a slump retaining agent, 1-3.5% organic retarder, 1-2% inorganic retarder, 0.1-0.4% air-entraining agent, and the balance is water, wherein the organic retarder is sodium gluconate, One or more mixtures of sodium citrate, sodium tartrate or white sugar, and the inorganic retarder is one or more mixtures of borax, sodium tripolyphosphate, sodium pyrophosphate or sodium polyphosphate. Compared with the prior art, the present invention has the following beneficial effects: the water reduction rate is higher, all exceeding 25%, the air content of the concrete is lower, the workability is better, and there is no segregation, bleeding, and black pulp phenomenon, The pumping construction is good and fully meets the construction requirements.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a retarding water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third-generation superplasticizer with excellent comprehensive performance. It has been produced and applied in developed countries such as Japan, Germany and the United States since the end of the 1980s. It has many advantages such as high water reducing rate, small loss of concrete slump over time, low dosage, great contribution to concrete strength, and good environmental protection. From high-speed railways to urban commercial concrete mixing stations, many domestic application companies have begun to choose polymer Carboxylic acid superplasticizer is an essential fifth component of concrete. As a new type of material, concrete water reducer can not only improve the level of construction technology, improve the performance of concrete,...

AI Technical Summary

Problems solved by technology

[0003] However, since the raw materials required for the production of high-performance concrete have strict requirements, regardless of the mud content of sand and stone or the fineness of fly ash and the amount of fire, there are strict requirements for high-efficiency water reduction in the construction of high-performance concrete. The requirements for the water reducing agent are also strict, both the water reducing rate of the water reducing agent and the air-entraining component of the water reducing agent will affect the quality of high performance concrete

[0004] At present, the high-efficiency water reducer on the market has a single performance, only has the function of water reduction, and has different adaptability to the cement of different manufacturers, and it must be compounded with other materials to change its adaptability, and it is difficult to control