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Research on Polycarboxylic Acid Type High Performance Concrete Water-reducer

Author: TanHongBo
Tutor: MaBaoGuo
School: Wuhan University of Technology
Course: Materials Science
Keywords: Superplasticizer Esterification Copolymer
CLC: TU528.042.2
Type: Master's thesis
Year: 2006
Downloads: 783
Quote: 10
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Abstract


This research work to the national \performance concrete water reducer synthesis process : ( 1 ) polyethylene glycol monomethyl ether esters of methacrylic acid with different molecular weight azeotropic distillation synthesis of a series of macromonomer methyl acrylate, polyethylene glycol monomethyl ether ester ( MAAMPEA ) , discuss the inhibiting polymerization mechanism of the catalytic mechanism of methacrylic acid , the various factors that affect the conversion rate , and infrared analysis to determine the optimum synthesis conditions : Polyethylene glycol monomethyl ether ( MPEG) and methacrylic acid (MAA) molar ratio : ( 1.15 ~ 1.2 ) : 1 ; selection of a polymerization inhibitor hydroquinone , methoquinone composite or separate use of phenothiazine , homemade PN ; catalyst used the p-toluenesulfonic acid , the amount of the esterification rate can be achieved under these conditions , the synthesis of methyl acrylate, polyethylene glycol monomethyl ether acetate ( MAAMPEA ) for 5 to 6% of the total mass of reactants with agent selection toluene ; , an amount of twice the total mass of reactants ; 98.9% . 2 the the homemade macromer methyl acrylate, polyethylene glycol monomethyl ether acetate ( MAAMPEA ) , methacrylic acid (MAA) and 2 - acrylamido-2- methyl- propyl sulfonate (AMPS) radical polymerization, synthesized a series of binary, ternary copolymer , copolymer superplasticizer composition of the dispersion properties and infrared analysis . The experiments show that the structure : when monomer MAAMPEA : MAA molar ratio of 1:3 , AMPS mole fraction is 10% , the copolymer has good dispersibility and dispersion retainability . Determined the optimal reaction conditions : initiator used ammonium persulfate , the amount of 5 to 7% of the weight of the reactants ; temperature of 80 ° C for 7 to 8h ; reaction time ; copolymer molecular structure similar with similar foreign products . Synthetic superplasticizer carried out a series of concrete, cement experimental results show that the homemade Polycarboxylate cement paste , better dispersion and dispersion retention , prepared concrete to maintain good fluidity and mobility ; concrete content of 1% water reduction rate can reach 25% , the performance is much better than naphthalene superplasticizer , quite with the performance of similar foreign products .

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products > General issues > Raw materials and auxiliary materials > Admixtures > Superplasticizer
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