Study On Synthesis And Properties Of A Kind Of Amphion Poly Carboxylic Acid Water Reducer

With the development of concrete technology,the green high performance concrete has become the main trend.Because the number of concrete engineering is increasing,the supply of raw materials has become a big problem,such as the sand resources become nervous,and the of sandpaper is declining,and manufactured sand has low quality with high powder content,and natural sand has a high clay content.All the problems mentioned earlier are obstacles in the promotion and application of poly carboxylic acid water reducer.The cationic monomer was introduced to the molecular structure of polycarboxylate superplasticizer to synthesis a kind of Amphion poly carboxylic acid water reducer which has a function of anti mud.poor quality raw materials such as manufactured sand and natural sand could be better used in modern concrete engineering,so that the concrete resources crisis of tension could be alleviated.The prenyl polyoxyethylene ether macromonomer(TPEG)were chosen as mian raw material in synthesis experiment of Amphion poly carboxylic acid water reducer,The method is radical polymerization,based on relative 1mol macromonomer and by using response surface experiment design method,the influence of acrylic acid(AA),acrylic-alpha hydroxy ethyl ester(HEA),two methyl ammonium chloride(DMDAAC)on performance of amphion poly carboxylic acid water reducer The results show that acrylic acid(AA),alpha hydroxy ethyl acrylate(HEA)have significant effect on the synthesis of amphoteric polycarboxylate superplasticizer,the optimal combination scheme under the same conditions is 3.93 mol acrylic acid(AA),2.00 mol alpha hydroxy ethyl acrylate(HEA),0.26 mol two dimethyl diallyl ammonium chloride(DMDAAC).The concrete experiment was mainly on manufactured sand with powder content of 10%and natural sand with mud content of 7.2%,the performance of two kinds of concrete were studied.The results show that concrete mixed with amphoteric polycarboxylate superplasticizer has better workability,slump of manufactured sand concrete can reach220 mm,the expansion is 510 mm,which is far better than mixed with ordinary polycarboxylate superplasticizer,the highest slump of natural sand concrete is 230 mm,highest expansion is 580 mm.the 7d compressive strength of concrete with amphoteric polycarboxylate superplasticizer is lower,and the lowest of C30 concrete is 27.6MPa.the 28 d compressive strength increases significantly,C30 concrete can reach 43.6MPa.As for chloride ion diffusion coefficient,the minimum of manufactured sand concrete with amphoteric polycarboxylate superplasticizer is 22.33×10-8cm2\s,and the natural sand concrete is 4.37×10-8cm2\s,both of which are lower than that of ordinary polycarboxylic water reducer.The methods of infrared absorption spectroscopy and gel permeation chromatography analysis were used to the characterization molecular structural.The results show that the the main functional groups of the molecular structure of Amphion poly carboxylic acid water reducer include amino,hydroxyl,carboxylic acid,ester and poly vinyl groups.the results of gel permeation chromatography show that the average molecular weight of amphion polycarboxylic acid water reducer has reached more than 50000,the dispersion coefficient is above 1.2.In manufactured analysis and research,it has been put out that the manufactured has the same part with traditional polycarboxylate plasticizer,besides,it can inhibit the clay water swelling,improve steric interactions and macromolecular hydrolysis.Through Zeta potential test,hydration heat experiment,cement paste fluidity experiment with different mud content,scanning electron microscope experiment,the manufactured was verified.