固化废弃泥强度性状试验研究

Experimental Study on Strength Properties of Solidified Waste Sludge

我国各地城市建设中会产生大量的废弃淤泥,针对阜宁地区工程废弃淤泥,制备了一系列水泥土试样并开展无侧限抗压强度试验,明确了其强度的影响因素以及破坏规律,为废弃淤泥的处理方法和资源利用问题提供一系列的试验数据。试验表明:水泥掺量和龄期的变化对废弃淤泥所制试样有一定影响。在水泥掺量相同时,养护龄期变大,试样的无侧限抗压强度也变大,同时拟合出的曲线表明强度的增长呈现线性增长;同一养护龄期时,随着水泥掺量增加,水泥土试样的无侧限抗压强度也增长且呈现明显的线性规律。若水泥掺量较低,其破坏应变较小,破坏形态呈现塑性破坏;当水泥掺量较高时,其破坏应变变大,破坏形态呈现脆性破坏的趋势。

A large amount of waste sludges are generated in the urban construction in China. Considering the reuse of waste sludge resources, a series of cement-soil mixed samples were prepared, and the unconfined compressive strength tests were performed for the engineering waste sludge in Funing area. The influencing factors and the strength failure mechanism were evaluated, and a series of test data were provided for the treatment method and the resource utilization of waste sludge. The test results show that the change of cement mixing ratio and curing age have a certain influence on the preparation of the waste sludge samples. When the cement content remains constant, the curing age increases, and the unconfined compressive strength of the specimen also increases. At the same time, the fitted curve shows that the strength increases linearly. With the same curing age, with the increase of cement content, the unconfined compressive strength of cement soil samples also increases and shows obvious linear relationship. In addition, if the cement content is low, the failure strain is small, and the failure mode is plastic failure. When the cement content is high, the failure strain increases, and the mode shows a trend of brittle failure.