化学强化剂对再生骨料及再生混凝土性能的影响研究

Effect of Chemical Enhancing Agents on the Properties of Recycled Aggregate and Recycled Concrete

采用聚合硫酸铝和水玻璃对混凝土再生骨料进行化学强化,研究了聚合硫酸铝溶液浓度、水玻璃模数对再生骨料的压碎指标、吸水率的影响,同时探究了其对再生混凝土力学性能和耐久性能的影响规律。实验结果表明:当水玻璃模数为2.8(溶液浓度为10.0%)时,再生骨料的压碎指标和吸水率明显降低,强化后配制的再生混凝土3d和28d抗压强度分别提高了57.14%和51.93%,并且耐久性能显著提升;当聚合硫酸铝浓度为20.0%时,聚合硫酸铝对骨料的压碎指标和吸水率的强化作用稍弱于水玻璃,配制的再生混凝土3d和28d抗压强度分别提高了32.47%和26.61%,同时耐久性能也有不同程度提高。与聚合硫酸铝相比,水玻璃对再生混凝土性能的强化作用更为显著。

Polyaluminium sulfate and water glass as the chemical enhancing agents were used to enhance the recycled aggregate, the effects of solution concentration of polyaluminium sulfate and modulus of water glass on the crushing index and water absorption of recycled aggregate were researched, at the same time the influence of the chemical enhancing agents on the mechanical strength and durability of recycled concrete were studied as well. The results show that the crushing index and water absorption of recycled aggregate are reduced effectively when the modulus of water glass is 2.8 (the solution concentration is kept 10.0%), the mechanical strength (the 3 d and 28 d compressive strength are enhanced by 57.14% and 51.93%, respectively) and durability of recycled concrete are also enhanced distinctly;the enhancing effect of polyaluminium sulfate is not as good as water glass, but the properties of recycled aggregate and recycled concrete (the 3 d and 28 d compressive strength are enhanced by 32.47%and 26.61%, respectively) are enhanced in varying degrees. Therefore, the enhancing effect of water glass on the recycled aggregate is more prominent than the use of polyaluminium sulfate.