Ebailila Mansour, Kinuthia John, Oti Jonathan
Department of Civil Engineering, Faculty of Engineering, Bani Waleed University, Bani Waleed, Libya.
School of Engineering, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UK.
Materials (Basel). 2022 Jul 22;15(15):5099. doi: 10.3390/ma15155099.
The role of gypsum level on the long-term strength and expansion of soil stabilised with different lime contents is not well understood. This research, therefore, studied the effect of varying gypsum concentrations of 0, 3, 6, and 9 wt% (equivalent to the sulfate contents of 0, 1.4, 2.8, and 4.2%, respectively) on the performance of sulfate soil stabilised with two lime levels (4 and 6 wt%). This was carried out to establish the threshold level of gypsum/lime (G/L) at which the increase in G/L ratio does not affect the performance of lime-stabilised sulfate soil. Both unconfined compressive strength (UCS) and expansion, along with the derivative thermogravimetric (DTG) analysis, were adopted to accomplish the present objective. Accordingly, the result indicated that the strength and expansion were proportional to the lime and sulfate content, of which a G/L ratio of 1.5 was the optimum case scenario for UCS, and at the same time, the worst-case scenario for expansion. This discovery is vital, as it is anticipated to serve as a benchmark for future research related to the design of effective binders for suppressing the sulfate-induced expansion in lime-stabilised gypseous soil.
石膏含量对不同石灰含量稳定土的长期强度和膨胀的作用尚未得到充分理解。因此，本研究探讨了0、3、6和9 wt%（分别相当于0、1.4、2.8和4.2%的硫酸盐含量）的不同石膏浓度对两种石灰含量（4和6 wt%）稳定的硫酸盐土性能的影响。开展此项研究是为了确定石膏/石灰（G/L）的阈值水平，在该水平下G/L比的增加不会影响石灰稳定硫酸盐土的性能。采用无侧限抗压强度（UCS）、膨胀以及衍生热重（DTG）分析来实现当前目标。相应地，结果表明强度和膨胀与石灰和硫酸盐含量成正比，其中G/L比为1.5是UCS的最佳情况，同时也是膨胀的最坏情况。这一发现至关重要，因为预计它将为未来有关设计有效粘结剂以抑制石灰稳定石膏土中硫酸盐诱导膨胀的研究提供基准。
