The Development Of The Curing Agent And Experimental Study On Stabilized Soft Soil

Adhere to the road of sustainable development is a long-term basic national policy. Recycling of industrial waste residue and the comprehensive management of the environment is always the core of sustainable development. FGD gypsum and slag is common types of industrial reject, with the continuous expansion of China’s industrial scale, these two waste production is also increasing year by year, which have brought a heavy burden on the urban environment. How to comprehensive utilization these two kinds of solid waste by the high level application has been a topic of common concern to the whole industry.In this paper, a series of mix design were conducted based on characteristics of these solid wastes, and several suitable activators were selected after a set of experiments. First, we performed test to determine several key factors impacting strength and stability, then, we conducted a set of orthogonal experiments to optimization the best mix about strength and stability, and process a second grinding. In order to further study on the hydration mechanism of several kinds of solid waste under the effect of activator, we choose the best optimal mix about the strength and stability progressed several microscopic test, such as scanning electron microscope and so on. We found that the hydration products of the curing agent (GSC) is similar to the cement.At the present stage, soft soil solidification is more common in the foundation reinforcement technology. Industrial residues is an efficient and inexpensive material, and it is often used for curing the soft soil.Through the comparison of the unconfined compressive strength test, the Early strength of GSC-stabilized-soil should to improve, the study also showed that GSC-stabilized-soil and cement-soil have similar intensity growth tendency. The laboratory experiment shows that the mixing ratios and water-GSC ratio have great effect on the strength of GSC-stabilized-soil, and the more the mixing ratios is, the better the stabilized effect of soft soil is. When the GSC-stabilized-soil have the same mixing ratio and water-GSC ratio to the cement-soil, the strength of GSC-stabilized-soil is less than the cement-soil, but from the stress-strain relationship of the stabilized soil, we can see that the ultimate strain of the GSC-stabilized-soil is bigger than cement soil,and the thoughness is batter than cement-soil. When mixing ratios of GSC is more than those of cement by3%, if the water-GSC ratio is same to those of cement, after28days, it has slightly lower strength than the cement-soil, and with the growth of the age, the gap between the both becomes small. When water-GSC ratio is lower than those of cement, after28days, if the mixing ratios of GSC is more than those of cement by3%, it has the higher strength than cement-soil, and with the growth of the age, the gap between the both becomes big. The results shows that GSC stabilized soil is feasible and it can meet the demand of cure strength. Through amending to the existing formula, we found the prediction formula of the strength of GSC-stabilized-soil, which can predicts the long-term strength relatively accurate...