Study on the Durability of Hydraulic Lime Soil Mixed with Sodium Methyl Silicate

Abstract

Natural hydraulic lime soil has good mechanical properties; as an earthen ruin restoration material, its durability is insufficient. Despite natural hydraulic lime being a topic that has been studied for several years from different researchers, it has not yet been fully considered for the improvement of durability. This work aims to experimentally investigate the enhancement of the durability properties of hydraulic lime-based. The performance of natural hydraulic limestone by adding sodium methyl silicate and organic silicon is examined and the effect of adding sodium methyl silicate on its performance and microstructure is studied. The 6%, 10%, and 15% lime–soil comparison test blocks of sodium silicate were compared with different lime–soil comparison test blocks not mixed with sodium methyl silicate; in addition to compression resistance, shear resistance, water absorption, and erosion resistance, dry–wet cycles were carried out, as well as microstructure testing and analysis. The results show that the addition of sodium methyl silicate enhances the compressive strength of hydraulic lime-modified soil, reduces its saturated water absorption, reduces its shear strength, improves its resistance to dry and wet cycles, and forms on the surface of the modified soil particles. The hydrophobic layer further improves its erosion resistance and water resistance. When the sodium methyl silicate content is 0.3%, the natural hydraulic lime soil has good mechanical properties and good durability, which is the optimal ratio.

Study on Synergistic Effect of Xanthan Gum and Sodium Methylsiliconate on Mechanical Strength and Water Stability of Phosphogypsum Road-Based Materials

“…However, the addition of SM decreases the unconfined compressive strength of non-immersed specimen, the unconfined compressive strength increases with the increase in content of SM, but it has not exceeded the unconfined compressive strength of PG. Indeed, SM creates a hydrophobic film on the surface of PG particles [47,48]. This film serves to shield PG from water erosion and dissolution, as shown in Figure 5.…”

“…The highest unconfined compressive strength is achieved when the dosage of SM and XG are set at 1.0%. This enhancement is due to the combination of SM and XG creating a hydrophobic film on the surface of PG and the vitreous framework formed by XG [47,48]. This hydrophobic film the PG and vitreous framework from direct contact with water, enhancing the strength of the specimens after immersion in water.…”

“…Figure 8b,c show that SM goes into voids and then crystallize, causing slight expansion within the voids. Additional, SM creates a hydrophobic film on the surface of PG particles [47,48], as shown in Figure 5, but this contributes little to the strength, the increase in unconfined compressive strength after immersion is due to the reduction in porosity caused by crystallization and the hydrophobic effect of SM, the main reliance is on the intrinsic cohesive strength of the PG itself, this is demonstrated in Figure 3b, where the strength of the immersed sample is similar to that of PG after the addition of SM. Figure 8 displays the SEM images of PG with and without 1.0% SM.…”

Study on Composite Improvement of Silt Sites by Lignin and Sodium Methylsilicate and Its Micro Mechanism

“…Through compaction test, strength test and permeability test, it is believed that it can significantly improve the mechanical and impermeability properties of silty sand in the Yellow flood area [12][13][14]. In conclusion, sodium methylsilicate can significantly improve the cohesion and internal friction angle of soil, and play a hydrophobic role in the dry wet cycle test [15][16][17]; Lignin fiber can form an integral spatial network structure with soil particles, effectively improving the strength of soil [18].…”

Study on the corrosion resistance of composite modified anti-corrosion mortar under the action of bio-organic water

“…Adding a waterproofing agent can reduce the number of open pores in concrete, lower water absorption, and effectively improve the resistance to chloride ion diffusion (Xiang et al, 2021;Chen et al, 2022). Sodium methyl silicate in cementitious materials will form a water-repellent reticular film with low surface tension to block ion penetration, thus significantly improving the impermeability of the material (Li et al, 2022;Ma et al, 2022). Inorganic water repellents can generate insoluble colloids and swelling compound salt crystals inside the material to fill the pores and increase the material's density, improving the material's corrosion resistance.…”