Study On Synthesis And Applied Performances Of Aliphatic Sulphonated Superplasticizer

Aliphatic sulphonated superplasticizer, because of its high efficiency of reducing obstacle and good temperature-resistance, it was widely used in the oil drilling industry in Europe and America originally. Considering the resemble of the oil well cement and the ordinary structural cement and other advantages as small dosage in use; and compared with polycarboxylate and naphthalinic superplasticizer which are widely accepted and used in construction today, there are some advantages such as consuming energy sources low in production, has little effect on the price of crude oil, nonpolluting for environment, and some characteristics like good appearance at appliance capabilities. It accords to the contemporary demand of building a saving resources and neighborly environment society. So in this dissertation, the synthesis and appliance capabilities of aliphatic sulphonated superplasticizer was chosen as the object of investigation, aliphatic sulphonated superplasticizer was synthesized by the reaction of acetone, formaldehyde and sodium sulfite in the 2-step way. In this thesis, the effect of the different reactive conditions on dispersive property of the superplasticizer and the effect of appliance capabilities of mortar and concrete was investigated systemically. It was the first time to synthesize aliphatic sulphonated superplasticizer in the multiple step way. And with the infra-red spectrograms of the preformed polymers and sulphonated polymers, the reaction mechanism was investigated and explained the relationship between mixture ratio and dispersive property in microscopic view successfully. This dissertation including such contents as follows:1.By studying the final disperse property of the superplasticizer on preformed polymers-formaldehyde and acetone condensation conpound, the best material mixture ratio is n(F):n(A)=1:1,reaction time is 1h, and reaction temperature is 50℃.2. By studying the disperse property of the sulphonated polymers on preformed polymers, the best material mixture ratio is n(F):n(PAF):n(S)=1:1:0.4, reaction time is 2.5h, and reaction temperature is 85℃.3. The structure of the aliphatic sulphonated superplasticizer was attributed by infra-red spectrum, approved that there were some hydroxyl groups (-OH) had been generated in preformed polymers, but not double bond of carbon (C=C), it showed that the type of the polymerization of aliphatic sulphonated superplasticizer was not addition polymerization, but transition polymerization. And according to the infra-red spectrograms of aliphatic sulphonated superplasticizer, ascertained the groups it has; explained the disperse mechanism successfully; the reaction mechanism was investigated and explained the relationship between mixture ratio and dispersive property in microscopic view triumphantly.4. By measuring the water-reducing ratio, ratio of compressive strength and ratio of bleeding rate of the mortar and concrete, compared with naphthalinic superplasticizer, it concludes that aliphatic sulphonated superplasticizer is a kind of high rang water reducing agent. At the same proportion of W/C, the fluidity, ratio of compressive strength and ratio of bleeding rate of the mortar and concrete with this kind of high water-reducing agent has improved greater than the concrete with naphthalinic superplasticizer. The aliphatic sulphonated superplasticizer showed much more predominance than the naphthalinic one.5. By investigating the dosage, the aliphatic sulphonated superplasticizer can remarkably improve the disperse property and compatibility of the mortar and fresh concrete by the addition of cement at 0.5%～0.6%, and at this dosage, it would be more economical.6. By studying the setting time of concrete, it showed that the aliphatic sulphonated superplasticizer reacted well on retardation, the initial setting time and the final set lasted 90min and 110min than original respectively. It proved that the concrete which added aliphatic sulphonated superplasticizer could transport to farther distance than the concrete with naphthalinic superplasticizer.7. By investigating the slump loss of concrete, found that at this capability, the aliphatic sulphonated superplasticizer was not good as polycarboxylate and naphthalinic superplasticizer showed. Aiming at this deficiency, put forward three feasible resolvents in this dissertation.