建筑垃圾再生骨料在海绵城市建设中的应用研究

Study on the application of construction waste recycled aggregates on the sponge city construction

以废混凝土、废黏土砖、废砂浆为主的建筑垃圾再生骨料堆积密度小、空隙率大、吸水率高,可以应用于海绵城市建设中。对比了再生骨料和天然骨料的蓄水率及其对温度的影响。结果表明,再生骨料蓄水率明显大于天然骨料,且再生骨料能够更有效降低环境温度,可进一步缓解城市热岛效应。再生骨料和天然骨料进出水pH值对比试验表明,再生骨料出水pH值和天然骨料相差不大,而且随着时间的延长,越来越接近进水pH值;而浸水试验表明,随着时间延长,废混凝土再生骨料的pH值明显升高。

Recycled aggregates based on waste concrete,waste bricks and waste mortar are light in weight,high in void rate and high in water absorption.They can be used in the construction of sponge cities.By comparing the water storage rate and the temperature influence of the recycled aggregate and the natural aggregate,it is shown that the water storage rate of the recycled aggregate is significantly larger than that of the natural aggregate,and the recycled aggregate can reduce the ambient temperature more effectively,which can further alleviate the urban heat island effect.By comparing the pH value of the effluent of recycled aggregate and natural aggregate,it is shown that the effluent pH of the recycled aggregate is not much different from the natural aggregate,and it is getting closer to the pH value of the influent with the extension of time.However,as extension of time,the pH value of the immersion water of the waste concrete recycled aggregates increases significantly.