Study on the Stabilization of a New Type of Waste Solidifying Agent for Soft Soil

Abstract

The use of desulfurization gypsum and steel/furnace slag composite cementitious material (DGSC) to solidify soft soil can fully utilize industrial wastes, reduce cement use and protect natural resources. By studying the unconfined compressive strengths of DGSC-solidified soil with different mix ratios, water-binder ratios and curing periods, the influence of those factors on the unconfined compressive strength of the soil can be analyzed. Furthermore, the quasi-water-cement ratio is introduced to predict the strength of the DGSC-solidified soil. The results show that the higher the DGSC content is, the better its effect on the soft soil. The variation in the unconfined compressive strength of DGSC-solidified soil overtime can be described by the same trend as that of cement-solidified soil but its early strength is lower than that of cement-solidified soil. When the water-binder ratio of the DGSC-solidified soil is the same as that of the cement-solidified soil, after a28-day curing period, the content of DGSC is higher than that of the 5% cement content, so the DGSC solidification effect is comparable to that of cement. Therefore, using DGSC instead of cement as a soft soil solidifying agent can meet the strength requirements of solidified soil.

Evaluation on the Mechanical Properties of Ground Granulated Blast Slag (GGBS) and Fly Ash Stabilized Soil via Geopolymer Process

“…In addition, different soil types behave differently for the purposes of building work [ 1 , 2 ]. In construction engineering, soil layers are often found to have a low bearing capacity, which significantly affects the various stages of construction involved, such as planning, implementation, operational, and maintenance stages [ 3 , 4 ]. In fact, there are multiple types of soil with different characteristics which depend on the location.…”

“…Furthermore, structures built on clay soils are subjected to extensive damages due to the adverse and unpredictable characteristics of the soil [ 4 , 5 , 6 , 7 , 8 ]. Usually, the soil will shrink with the reduction of moisture content and swell with the increase in moisture content [ 8 , 9 ].…”

“…Clay soil has high plasticity, low support, and high shrinkage when the soil contains water [ 9 , 10 ]. This condition encouraged civil engineers to seek solutions in order to strengthen the soil through soil stabilization [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Soil stabilization aims to increase the mechanical properties of the soil and also to control plasticity and shrinkage in soils containing excess water [ 4 , 8 , 9 , 10 ].…”

“…This condition encouraged civil engineers to seek solutions in order to strengthen the soil through soil stabilization [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Soil stabilization aims to increase the mechanical properties of the soil and also to control plasticity and shrinkage in soils containing excess water [ 4 , 8 , 9 , 10 ]. In order to successfully withstand superstructure loads, soil stabilization techniques are essential to ascertain the excellent stability of soil [ 6 , 9 , 10 ].…”

Stabilization of a Clayey Soil with Ladle Metallurgy Furnace Slag Fines

“…Similar to the performance of lime in stabilizing dispersive soils [ 29 , 30 , 31 ], the cation exchange, flocculation and agglomeration, and pozzolanic reaction can occur as a clayey soil reacts with certain free oxides in SFS. Various research studies have been conducted to employ SFS to enhance the properties of problematic soils, while primarily demonstrating that SFS can be an effective stabilization agent [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. From the early 1990s, Akinmusuru [ 43 ] pioneered the attempt to use SFS in soil stabilization for rural roads with low traffic volume, which suggests that SFS possesses the potential to improve the soil properties by increasing the strength, California bearing ratio (CBR), and dry density.…”