Improving measures on the compatibility of cement and plasticizer
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In view of the importance of the compatibility of cement and plasticizer,it discusses the factors influencing compatibility from the aspects of cement and plasticizer.And it puts forward operable measures to enhance the compatibility of cement and plasticizer.Keywords:
Plasticizer
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From viewpoint of material science, and based on the applying experience, three main factors such as the lower-flow-back of cement slurry, the bulk shrinkage and the high fragility of cement stone, which affect zonal bonding quality of cement sheath, are expatiated through analyzing congenital defect of oil well cement and the properties of additive. On the basis of discussing novel material function mechanism, settled project is put forward primarily and novel material field applications are introduced. The technique requirement of cementing material for domestic oilfield and the future ways of research are proposed.
Shrinkage
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High performance concrete is a concrete mixture, which possess high durability and high strength when compared to conventional concrete. This concrete contains one or more of cementious materials such as fly ash, Silica fume or ground granulated blast furnace slag and usually a super plasticizer. The use of some mineral and chemical admixtures like super plasticizer enhance the strength, durability and workability qualities to a very high extent. Use of High Performance concrete in construction enhances the service life of the structure and the structure suffers less damage which would reduce overall costs. In this paper will focused about the mixing of super plasticizer for improve the performance of concrete compressive strength.
Plasticizer
Silica fume
Superplasticizer
Service life
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Plasticizer
Shrinkage
Superplasticizer
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The factors leading to the incompatibility between concrete superplasticizers and cement were discussed, and some useful methods to solve these problems were put forward. In addition, The reasons and the mechanisms of the greater slump loss of concretes added with superplasticizers were summarized, and some valid measures which can be used to control the slump loss of the concretes were proposed.
Superplasticizer
Concrete slump test
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The effects of physical and chemical speciality,superplasticizer characteristic,species and dosage of admixture,carpolite and sand on compatibility were studied.Also,the effect of superplasticizer on paste rheology(fluidity and stability)from mechanism,and the relation between compatibility and concrete durability were analyzed.It indicated that excellent compatibility was the base of making high performance concrete,and discussed how to build quantitative evaluatation way of compatiblity initially.
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Abstract. The article dwells on existing methods of plasticizing additive introduction into Portland cement-based concrete mortars. A review was performed of available works studying the reasons of different effect of pasticizers depending on the method of their introduction into concrete. It was supposed that different results in effectiveness of such additives may be connected to not only adsorption processes taking place on the surface of Portland cement aluminate and sulfate phases, but also to their concentration capillary redistribution mechanism within concrete structure. This assumption was experimentally tested using dispersed building materials deprived of calcium sulfates and aluminates. Dry process clinker-based cement consumption may be positively reduced at presence of a plasticizing additive provided it was wetted before that with mixing water. Such a result confirmed authors’ assumption that not only plasticizing agent, but cement as well may be spared in case of combined additive introduction method while maintaining the values of rheological and strength parameters of obtained products. An additional reduction in cement consumption per unit mass of products leads to a decrease in the "clinker-concrete intensity" parameter. This opportunity will contribute to the reduction of the greenhouse effect by reducing CO2 emissions into the atmosphere when firing Portland cement clincer. We concluded that our proposed decisive role of plasticizing additive redistribution capillary mechanism in cement paste intergrain air space enables, on a par with its adsorption counterpart, a more substantiated prediction of applied plasticizer efficiency depending on their properties, as well as on condition and pjase composition of applied binders and aggregates. Efficiency of cone penetration methods was demonstrated in analysis and control of Portland cement condition and behavior.
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Superplasticizer
Aluminate
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The physical structure of cement is of pivotal importance in the study of volumetric stability and cracking of concrete. While most of efforts in the category of crack mitigation of concrete have been devoted to the incorporation of sophisticated chemical admixtures into concrete mixtures, less attention has been paid to the fact that the modification of cement structure can be considered as a sustainable solution to this problem. This study aims to investigate the effect of the modification of the physical structure of cement on workability, early-age strength and autogenous shrinkage of cement pastes. The results show that the modification of cement physical structure can be used as a sustainable route to reduce shrinkage of cementitious materials.
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Cementitious
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According to the liquid concrete testing and application results,its performance and quality!was studied from the mixture ratio design and construction. It was found that the key factors influencing the liquid concrete performance are the liquid concrete additive and the cement adaptability. The paper analyzed the relation of the gypsum configuration and the cement coagulation and slump testing losing, it was pointed out that the alkali content can influence the cement hydrating and the high dicalcium silicate and the slump losing, the cement adaptability has relation with additive variety,action mechanism, raw material selection and produce technique, and it can be effected by environment temperature, putting materials fashion and additive quantity.
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The common concrete and cement mortar have many advantages,but their poor permeability resistances,under the action of corrosive medium,the service life was shorten. Joining the polymer is an effective way to solve this problem. Furthermore,polymer can significantly improve the performance of the cement-based materials. The kinds of polymer are introduced in modified cement mortar and concrete. The modified mechanism and application of polymer cement based materials are discussed. The problems and future applications of polymer cement based materials are pointed out.
Polymer Concrete
Service life
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According to the usable functions and chemical properties of additives the types of cement concrete additives are classified. In view of various use of them practice application methods are introduced. Author points out that proper use of additive can save consumption and enhance strength of cement to acquire good economic benefits.
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Consumption
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