Abstract
Steel slag is a major industrial waste. Because of poor volume stability, its utilization was limited. We adopted polyphosphate modified steel slag and tailings to produce the autoclaved brick. The effects of various factors influencing the performance of brick were investigated, and the results were obtained: forming water 9%, forming pressure 20MPa, curing regime 4(temperature rising, hr)-4(temperature holding at 180°C, hr)-natural cooling (temperature dropping). With the content of modified steel slag in brick increased from 11% to 25%, the content of cement reduced from 7% to 5%, the compressive strength value increased from 11.6MPa to 22.1MPa.
Highlights
Large-scale industrial mining operations generate thousands of tons of waste rock and tailings, which pollute the air, soil and ground water, and induce geological disaster
There is a certain amount of free calcium oxide and magnesium oxide in the steel slag, which will lead to volume expansion in construction and building material for a long time and cause bricks cracking [5]
Cement, and tailings at the mass ratio of 25:7:68, pressure forming at 20MPa
Summary
Large-scale industrial mining operations generate thousands of tons of waste rock and tailings, which pollute the air, soil and ground water, and induce geological disaster. There were more than five billion tons accumulated steel slag in China, most of them is still land filled [1,2]. It has caused extensive attention of state and local governments. Using steel slag totally or partly replace the cement, mixed with tailings and cement in a certain proportion, to produce the autoclaved bricks can protect the environment, and reduce production cost. Use the modified steel slag to replace cement partly in producing autoclaved brick with low silicon tailings. The content in brick of steel slag is increased, cement reduced and realizing the high-added value use of steel slag
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