Investigation On Electrical Characteristic And Hydration Capacity Of Different Mineral Admixture

The development of science and technology with rapid change plays a very big role to the progress of all trades and professions. Since the cement came out at the beginning of the 18th century, the cement concrete had already become the most extensive large construction material, as the cement and concrete produce the constant improvement and development which prepare technology, in addition its environmental friendship characteristic is prominent, a lot of known experts and scholars in the world, thought concrete would as one of main large building materials in 21st century cement unanimously, had wide development prospects.About the studying of the hydration mechanisms, hydration characteristics and courses of the cement, went on a large amount of work in the past, had different theories, led electrochemical theory and method into cement chemical field, one subject for research that door had a bright future, it would contribute to people from the microstructure of mineral, even disclosed the relations between mineral structures and performances on the levels of the ions, performances of the cement hydration for a lot of new meaning, instructed people to be correct to study cement minerals further. In addition, the study on water result system, linked the microstructure of the molecule to macroscopical performance directly, had offered a new way for design of the cement material too.This paper had analyzed the factors influencing the resistivity change, and utilized the non- contact resistivity device to study the resistivity change in 24h of cement pastes. The result showed: resistivity curve and heat of hydration curve variation tendencies were approximate and unanimous, can be regarded as a kind of new method to study hydration. Had tested and studied the resistivity in different temperature and different concentration of solution separately with this device at first, the resistivity increases with increase of the data. On this basis, blended fly ash, slag, silica fume into the cement, study the influence on resistivity of cement pastes. The result showed: Resistivity increased with content increasing at the beginning, the fly ash, this characteristics, was not very unanimous. And every curve was it dropped first, had again one balanced issue, raise trend finally. This paper proved with XRD and strength test at the same time; and had made analysis from the density of the ion. Then, having studied different admixtures resistivity in the mortar again, it had the same trend. Then, high-efficient water-reducing agent was studied with marsh. Joined FDN at the same time, also put into the cement pastes which mixed the admixture and carried on research its curves had laws as that. Finally, this paper had been spent and fitted to different data while admixing material 10min and 24h, fought that the curve that 10min fits was on good fitting than that of 24h. Indicated that to different admixing the material, ifestablished the relation with strength, the curve that 10min fits is good than 24h.Resistivity curves provide a lot of message of cement pastes hydration for us, for example setting time, hydration divisions at stage, and the information of physics and the chemistry of the admixtures etc., this a kind of new research method of cement hydration, and the deep performance which will discuss the cement hydration, setting, hardening, will play a role in casting a brick to attract jade afterwards further. Have offered information too in studying the activation of admixtures.