Study on the Properties of High-Performance Ground Iron and Steel Slag Based on the Uniform Design
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STUDY ON THE PROPERTIES OF HIGH-PERFORMANCE GROUND IRON AND STEEL SLAG BASED ON THE UNIFORM DESIGN T. S. He, Q. D. Chen, Z. B. Li, Y. Liu,1
UDC 539.4
X. G. Zhao, and S. Y. Zhao Ground iron and steel slag with excellent performance was prepared using the uniform test design. The influence of the fineness and content of steel slag powder on the fluidity and strength of the powder mortar was studied, the regression equations of fluidity and compression strength of different ages are derived, and the contour map is drawn. Based on the optimized composition, the bleeding and dry shrinkage properties and their application in slag concrete are evaluated; the results are compared with ground granulated blast furnace slag powder. The correlation coefficient between fluidity and compression strength of the mortar is more than 0.99, and the predicted value is in good agreement with the measured value, and the average relative error is less than 2%. Regression and isogram analyses show that an increase in the slag fineness and a reduction in its the content contribute to the improvement of the cementiting slag activity. The adequate composition is: steel slag (specific surface area: 520 m2/kg): 20%; blast furnace slag: 80%. Appropriate slag amount can significantly reduce the bleeding and dry shrinkage properties of mortar and optimize the microstructure of the interface transition zone of the concrete aggregate. Keywords: uniform design, steel slag powder, mechanical properties, bleeding, dry shrinkage. Introduction. To protect the environment, reduce the consumption of natural resources and improve the performance of cement concrete are the two most important problems in the development of cement and concrete in the world [1–3]. Steel slag (SS) is a large amount of industrial solid waste. It is likely to be an efficient way to develop and use it as an auxiliary cementitious material for cement and concrete [4–6]. The reasons are as follows: (1) Portland cement is a large amount of basic materials, which has a strong ability to absorb large amount of industrial solid waste; (2) SS is rich in C3S, C2S and other minerals [7, 8]. It is a kind of industrial waste slag similar to low-quality Portland cement clinker, which has certain cementitious performance and basic conditions for cement and concrete utilization [9, 10]; (3) Compared with ordinary Portland cement and concrete, SS as an important component of cement and concrete has significant advantages such as high strength growth, micro expansion, wear resistance, impact resistance and carbonation resistance [11, 12]. Ground granulated blast furnace slag (GGBFS) is a kind of waste slag containing silicate, aluminate and aluminosilicate. It has high content of glass body and high hydration activity. Under the excitation of Ca(OH)2 generated by cement hydration, it can produce pozzolanic reaction and improve the pore structure of hardened paste [13–16]. But the performance of concrete with a high GGBFS content is unsatisfactory in many respects, such as: Fresh concrete with h
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