礦渣—水泥復合膠凝體系低溫水化特性研究
[Abstract]:China's cold region has a vast territory, including 13 provinces in the "Three North" areas, cities and autonomous regions, which account for more than 50% of the country's area and winter time for up to 3-6 months. Therefore, the study of concrete construction technology in cold regions is particularly important in winter. The durability of soil has a great influence. Under the alkaline condition, the slag will be hydrated and produce the hydrated product of calcium silicate gel and zeolite. The formation of the solid structure is very dense. At low temperature, the cement hydration model is put forward to provide theoretical support for the construction of concrete in cold area in winter. Therefore, the slag cement compound adhesive is studied. The hydration law of the condensate system at low temperature is of great significance. This paper focuses on the hydration law of the slag cement composite cementitious material system at low temperature, and studies the effects of the amount of slag and the hydration temperature on the hydration heat rate, the hydration heat, the non evaporative water content, the mechanical properties and the microstructure of the composite cementitious material system. The dynamic parameters of the low temperature hydration of the slag cement composite cementitious material system are calculated, and the mathematical model of the hydration reaction of the composite cementitious material system at low temperature is verified and established. The results show that the slag cement composite is combined with the increase of the amount of slag and the amount of slag admixture, and the decrease of the hydration temperature. The hydration heat rate and the hydration heat, the compressive strength and the flexural strength, the non evaporative water content of the cementitious material system decreased. When the hydration temperature was -10 C, the slag content was 0,10%, 30%, 50% respectively. The hydration time of the compound cementitious material system entered the accelerating period compared to the pure Portland cement system, which lagged behind 0.17h, 0.43h, 0.62 respectively. H, in addition to the acceleration period, the hydration time is 20h, the hydration temperature is 5 C, 0 C and -10 C. At this time, the hydration heat rate of the composite cementitious material system with the slag content of 50% is 50% lower than that of the pure Portland cement system by 25.77%, 40.75%, 43.25%; the non evaporative water content of the composite cementitious material system decreases with the increase of the slag content, with the age of age. The non evaporation water content of the composite cementitious material mixed with slag is lower than that of pure cement paste system. The non evaporative water content of the composite cementitious material system with hydration age of 28d is -10 C and the amount of slag is increased by 11.79%, 16.64%, and 45.38%. hydration temperature is -10 C, and the slag content is 30%. The non evaporative water content in the cementitious material system increased by 83.87%, 145.16%, respectively, with the increase of the slag content and the decrease of the hydration temperature. The compressive strength of the mortar specimens of the composite cementitious material system was reduced. The hydration temperature was -10 C, the age of hydration was 28d, and the content of different slag was mixed. The compressive strength of the cementitious material system was reduced by 12.96%, 26.80%, 34.58% and 8.52%, 24.03%, and 36.43%., according to the Krstulovic-Dabic dynamic model of cement hydration, was used to characterize the 3 processes of hydration reaction, and the dynamic parameters of the composite cementitious material system under low temperature, K, N and each other, were obtained. The relationship between the rate of reaction and the degree of reactivity. By calculating the reaction rate curves of each stage, the actual hydration rate da/dt curve of the composite cementitious material system, drawn by the calorimetric data, can be simulated in a piecewise way. By calculating the obtained kinetic parameters, the composite cementitious material under low temperature conditions can be obtained. The degree of hydration reaction in different reaction stages is predicted and the mathematical model of compressive strength is established. Through the established linear regression equation, it is found that not only the regression equation is very significant, the R2 value is more than 99%, but the slag content has a very significant effect on the compressive strength of the composite cementitious material system. The use of SEM Atlas It can be seen that a large number of fine ettringite crystals are produced in the pure cement paste, and the shape is complete. In the cement slurry with the age of the slag, the crystal of ettringite is short and fine, the shape is incomplete and the microstructure is loose, which leads to the reduction of the compressive strength. The age of hydration is 3D and compound glue can be seen through the XRD study. The proportion of CH in the condensate system decreases with the increase of slag content, which is the same as that of the non evaporative water content and the compressive strength.
【學位授予單位】:沈陽建筑大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TU528
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