Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

Sun, Zhidong; Zhang, Junxiang; Sun, Yajun

doi:10.1155/2019/9084861

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…When the polymer grouting material is used to repair the uneven settlement and deformation of the frozen soil subgrade, the black and white components of the raw material create a curing reaction under the action of various catalysts and finally form a rigid polyurethane foam with a certain strength [22][23][24]. Throughout the phase change process, a significant amount of heat is generated owing to the release of chemical bond energy.…”

Section: Phase Change Processmentioning

confidence: 99%

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

Zhang

Wang

Zhong

et al. 2021

Advances in Polymer Technology

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Polyurethane polymer grouting material has been effectively applied and promoted in the repair of road damages in nonfrozen areas. However, this material undergoes an exothermic reaction in the curing stage, which can cause a thermal disturbance in the frozen soil subgrade. To minimize the influence of the thermal disturbance of the polyurethane polymer grouting material in the repair of the frozen soil subgrade, an experiment was conducted to reduce the heat of the curing reaction under the influence of different proportions of a foaming agent, high-boiling point solvent, catalyst, and prepolymer. According to these test results, a proportioning scheme for the low exothermic polymer grouting material was formulated. The results indicated that the curing reaction temperature threshold of the polyurethane polymer grouting material was negatively related to the proportion of physical foaming agent (HCFC-141b) and high-boiling point solvent and positively related to the proportion of water weight. In the three stages of rapid temperature rise, slow temperature rise, and constant temperature, the rate of the temperature rise of the low exothermic polymer grouting material was lower than that of the common polymer, and the curing temperature threshold was 30.34% lower at a value of 101°C. At a density of 80 kg/m3, the compressive strength and tensile strength of the low heat release polymer grouting material were lower than those of the common polymer grouting material, thereby ensuring the excellent performance of polyurethane foam and providing a theoretical reference for the rapid repair of frozen soil roadbed diseases.

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Section: Phase Change Processmentioning

confidence: 99%

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

Zhang

Wang

Zhong

et al. 2021

Advances in Polymer Technology

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“…Therefore, research on grouting materials for coal mines has become an important research direction for the safety of coal mining. For example, a new soluble polymer foaming grouting material was developed by using hydrophilic amino resin as the base material [ 7 ], polyurethane/water glass (PU/WG) grouting materials [ 2 ], ordinary portland cement (C), high-strength gypsum powder (G), and a small amount of water glass (S) as matrix components to make CGS grouting material [ 8 ]. In addition, a modified grouting material was developed by using the double liquid grouting mode [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fly Ash on the Foaming Behavior and Flame Retardancy of Polyurethane Grouting Materials

et al. 2022

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Polyurethane (PU) grouting material has been widely utilized to control water inrush in mining fields. However, the application has been limited by its high cost and poor flame retardancy. Here, we use the fly ash (FA), a waste from coal of the iron-making industry and power plants, as a partial replacement of conventional filler in PU grouting materials to reduce the production cost and the environmental pollution of FA. The surface-modified FA-filled PU (PU/FA) composites were prepared by room-temperature curing. The effects of FA contents (φ) on the structure, foaming behavior, thermal stability, mechanical properties, hydrophobic properties, and flammability of PU grouting materials were examined. Results showed that the higher the φ, the more porous the PU/FA composites are, resulting in a lower density and lower mechanical properties. The relationship between the compression modulus E and the density ρ of the PU/FA composites was E ∝ ρ1.3. In addition, the surface-modified FA improved the compatibility between the hard and soft segment of PU in the PU/FA composite, giving the composites enhanced thermal stability, high hydrophobicity, and flammability resistance.

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“…Miao et al [8] studied the influence of the content and fineness of limestone powder on the rheological properties of cement paste: the fluidity of cement slurry increases with the increase in the content of limestone powder, and decreased with the increase of limestone powder fineness. Zhang et al [9,10] have prepared coal/ polymer composite grouting material with improved mechanical properties by adding binders to coal chips. Du et al [11] have conducted an orthogonal liquidity test on viscosity-varying grouting materials with different pumping time; the influence of water-cement ratio and the additive agent on the properties of slurry flow are analyzed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Guo

Xue

Zheng

et al. 2021

Advances in Materials Science and Engineering

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To ensure the sealing effect of gas extraction borehole in underground coal mine and improve the concentration of gas extraction, a kind of high-flow sealing material which can be injected into the microcracks around borehole was developed. The ultrafine cement as the base material, with water-reducing agent, expansion agent, retarder, the material, and water combined stir, will form a kind of colloid with high fluidity and slightly expansibility. This paper analyzes the differences between the new high-fluidity sealing material and ordinary cement materials in expansion performance, compressive strength, and sealing performance. Scanning electron microscope and mercury intrusion method were used to analyze the differences in microscopic morphology and pore structure of these two materials. The experimental results show that the new high-fluidity sealing material has an excellent fluidity of 295.5 mm with an expansion rate of 60 d being 1.562%. The new high-fluidity sealing material is convenient for grouting with strong material permeability and superior sealing performance. Field test results show that the effect of the new high-fluidity sealing material is better than the ordinary cement materials. The average drainage concentration and flux during the drainage period were 59.07% and 0.243 m3/min, respectively, which showed that the drainage efficiency was significantly improved. This novel sealing material is of great significance for improving the efficiency of drilling and drainage.

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Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

Cited by 8 publications

References 22 publications

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

The Influence of Fly Ash on the Foaming Behavior and Flame Retardancy of Polyurethane Grouting Materials

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

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