Experimental Study on the Performance of Compound Improved HLLS (High Liquid Limit Soil) with Various Curing Agents

Abstract

The HLLS (high liquid limit soil) has the characteristics of high moisture content, low bearing capacity and poor water stability. Most of the existing treatment methods focus on the improvement with a single curing agent, and the research on the improvement of HLLS with various curing agents is still insufficient. This paper presents the characteristics of two kinds of compound improved HLLS based on unconfined compressive strength test. The results show that the unconfined compressive strength of CSIS (Cement / SAP Improved Soil) and CLIS (Cement / Renolith Improved Soil) are greatly improved than those of CIS (Cement Improved Soil) when the curing age is 28d, respectively. The maximum increments of unconfined compressive strength are 0.31MPa and 0.22MPa, respectively. When the cement content is less (more) than 3%, the unconfined compressive strength of CSIS decreases (increases) with the increase of SAP content. When the cement content is constant, the unconfined compressive strength of CLIS increases first and then decreases with the increase of the Renolith content. The optimum mix amount of SAP (Renolith) and cement in CSIS (CLIS) are 0.06% (0.2%) and 5% (3%), respectively. The strength and crack resistance of the two kinds of compound improved soil are better than the one with single curing agent. SAP and Renolith exert the properties of self-curing after water absorption and hydrophobicity, respectively.

Experimental Study on Mechanics and Water Stability of High Liquid Limit Soil Stabilized by Compound Stabilizer: A Sustainable Construction Perspective

“…As the curing age increased, the q u and E gradually increased; in the actual construction process, the strength growth ratio from 7 to 28 days is an important guarantee for the project's continuously stable and efficient progress. Assuming the G represents the growth ratio of the q u and E from the 7th curing day to the 28th curing day, the growth ratio of q u and E can be calculated using Equations ( 1) and (2). When the proportion of the inorganic material was 15%, G qumax = 32.98% and G Emax = 20.94%.…”

“…High-liquid-limit soil refers to fine-grained soil with a liquid limit greater than 50% and a plasticity index greater than 26 [1], which is widely distributed in the Chinese southern where the rainfall and lake are abundant. Due to the high water content, low strength, and poor water stability, it cannot be directly applied to subgrade filling [2] and may cause severe diseases such as roadbed cracking, uneven settlement and slope instability [3]. Aiming to dispose the high liquid limit soil, there are mainly two types of the method proposed by researchers [4][5][6][7].…”

Influence of Chemical Polymer Additive on the Physical and Mechanical Properties of Expanded Polystyrene Concrete

“…Few authors who have investigated the liquid polymer-based product (Renolith) concluded that it has significantly improved the workability of the cement stabilization process in a variety of road subgrade, rail, embankment, and other construction projects [12]. It also improves the properties of poor soils [13]. Therefore, an experimental investigation was also carried out to ascertain its effect on a concrete mix.…”

Curing Mechanisms of Polymeric Nano-Copolymer Subgrade

“…The test showed that the micropores of the active MgO carbonation solidified soil significantly reduced, leading to slightly lower strength. Que [ 24 ] compared the effects of cement, lime, EN-1, and other curing agents on soil reinforcement of Fujian high-liquid-limit clay through mechanical property analysis, durability tests, microscopic tests, and numerical calculation. The results showed that the improvement effect of the ionic curing agent and polymer curing agent was obvious.…”