Method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder
A technology of ready-mixed concrete and recycled concrete, which is applied in the field of building materials, can solve problems such as the inability to realize the disposal and utilization of waste commercial concrete, affect the working performance of recycled concrete, and affect the vibration and compactness of recycled concrete, so as to be beneficial to industrial production and application, The effect of slowing down excessive consumption and low cost of raw materials
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Embodiment 1
[0042] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 3 hours; (2) 0.06% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (4) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add 40% of recycled powder and 0.16% of polycarboxylate superplasticizer to the total mass of the mixture, and stir for 5 to 10 minutes.
Embodiment 2
[0044] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 3 hours; (2) 0.06% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (4) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add 10% of recycled powder and 0.16% of polycarboxylate superplasticizer, which account for the total mass of the mixture, and stir for 5 to 10 minutes.
Embodiment 3
[0046] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 4.5 hours; (2) 0.13% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (1) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add recycled powder accounting for 40% of the total mass of the mixture and 0.31% polycarboxylate superplasticizer, and stir for 5 to 10 minutes.
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