Experimental Study on Preparation of C40 Concrete with Industrial Solid Wastes from High-titanium Blast Furnace Slag
DU Huihui1,2, NI Wen1,2, GAO Guangjun1,2
1 School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
Abstract: In order to enhance the rate of comprehensive utilization of low activity water-quenched high-titanium blast furnace slag, the cementitious materials were prepared by the technical route of multi-solid waste synergistic excitation. The optimized ratio of water-quenched high-titanium blast furnace slag-steel slag-gypsum-based cementitious materials was determined by orthogonal test. All solid waste concretes were prepared by using undisturbed water-quenched high-titanium furnace slag as aggregate. The results show that the optimal ratio of cementing materials is: the mass ratio of high-titanium blast furnace slag and steel slag is 2∶1, desulfurization gypsum content is 16%, superplasticizer content is 0.28%, water cement ratio is 0.24. When the rubber sand ratio is 1∶1, the 28 d compressive strength of all solid waste concrete test blocks can reach more than 40 MPa under standard curing conditions, meeting the requirements of C40 concrete strength. The results of XRD, TG-DTA and SEM-EDS show that high-titanium blast furnace slag and steel slag promote each other and coordinate hydration under the stimulation of desulphurization gypsum. The hydration products are mainly needle-stick ettringite (AFt) and amorphous C-S-H gel. With the increase of hydration products, ettringite crystal tends to be stable, and the dense structure formed by the interpenetration of C-S-H gel and ettringite is conducive to the growth of concrete strength.
杜惠惠, 倪文, 高广军. 水淬高钛高炉渣制备C40全固废混凝土试验研究[J]. 材料导报, 2020, 34(24): 24055-24060.
DU Huihui, NI Wen, GAO Guangjun. Experimental Study on Preparation of C40 Concrete with Industrial Solid Wastes from High-titanium Blast Furnace Slag. Materials Reports, 2020, 34(24): 24055-24060.
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2020, Vol. 34 
