建筑垃圾碎末和石灰粉对上海黏土抗压强度的影响

上海地区黏土普遍具有强度低、易变形的特点,为了改良这种特性,将建筑垃圾碎末和石灰粉以不同的质量加筋率加入到上海黏土中,并在不同的养护龄期下对各试样进行无侧限抗压试验,对试验结果进行分析和讨论,研究建筑垃圾碎末和石灰粉对上海黏土抗压强度的影响。研究结果表明:建筑垃圾碎末对土的抗压强度影响不明显,但能有效地提高土体的延性;石灰粉能够有效地提高土体的抗压强度,但土体的脆性增加明显;在同时添加建筑垃圾碎末和石灰粉的情况下,土体的抗压强度和延性均有明显提高。其中,当加筋率为4%石灰粉和20%建筑垃圾碎末时,土体的抗压强度提高达到最适宜值。

Influence of construction waste fines and lime powder on compressive strength of clay in Shanghai

In order to overcome the low strength and high deformation characteristics of Shanghai clay, this paper studied that mixed construction waste fines and lime powder into Shanghai clay with different weight reinforcement ratios, and cured the clay with different amounts of time. Through unconfined compressive strength testing, we investigated the impact of construction waste fines and lime powder on the compressive strength of Shanghai clay. The results indicated that construction waste fines had no obvious impact on soil compressive strength, but improved the ductility of soil. The lime powder can effectively improve the compressive strength of Shanghai clay as well as soil residual strength. The compressive strength and ductility of the soil is enhanced and its brittleness is reduced when construction waste fines and lime powder are mixed into the clay. The most suitable reinforcement ratio for compressive strength of soil is 20% of construction waste fines and 4% of lime powder.