|
This thesis from of the portland cement four single minerals (C3S, β-C2S, C3A, C4AF) fired its Naphthalene UNF - 5 , amino sulfonate AS, aliphatic Department of FAS , acrylic graft copolymer Mixtures PC four superplasticizer adsorption tests , combining with four superplasticizer molecular weight , infrared, surface tension , and four single mineral surface potential in the case of the presence or absence of superplasticizer range of analytical testing explore the the four single mineral different superplasticizer adsorption mechanism . The results show that : the hydration of Portland cement four single mineral surface electrical properties of silicate single mineral ( C3S , beta - C2S ) negatively charged aluminate single mineral ( C3A , C4AF ) was positively charged . Mineral - water - super plasticizer system , silicate single minerals ( C3S , beta - C2S ) superplasticizer adsorption , adsorption from the main single mineral silicate ( C3S , beta - C2S ) ; aluminate single mineral ( C3A , C4AF ) superplasticizer adsorption from the adsorption system is the hydration products of the aluminate single mineral ( C3A , C4AF ) . Silicate single mineral ( C3S , beta - C2S ) on the four superplasticizer adsorption , the adsorption amount of the same particle fineness , and showed a tendency to increase the specific surface area increases as the particle , the amount of adsorption ; aluminum acid salt single mineral ( C3A , C4AF ) adsorption on four superplasticizer , the particle fineness little effect on the adsorption capacity . The same time, the amount of adsorption with single mineral itself, the nature and type of superplasticizer . Different single mineral with superplasticizer adsorption , the adsorption amount of size basic showed the following laws : C3A GT ; C4AF GT ; C3S gt ; beta - C2S . With single mineral adsorption on the type of superplasticizer , the amount of adsorption type , the performance of the super- plasticizing agent Fas UNF - 5 is the maximum amount of adsorption , the adsorption amount of superplasticizer PC Min superplasticizer AS adsorption agent center. Super plasticizer FAS , UNF - 5 rod lying adsorbed on particles or hydration products adsorbed on the surface of the particles , the particles dispersed mainly to electrostatic repulsion ; adsorption of the superplasticizers PC to non- uniform segment adsorbed on the surface of the particles , the dispersion sterically hindered mainly ; superplasticizer AS is adsorbed on the particle surface to the coil and the caudate adsorption particles are dispersed , the combined effect of the electrostatic repulsion and steric hindrance .
|