Experimental analysis of Nano-SiO2 modified waterborne epoxy resin on the properties and microstructure of cement-based grouting materials

Liu, Weitao; Sun, Yida; Meng, Xiangxi; Qin, Yueyun

doi:10.1016/j.energy.2023.126669

Cited by 34 publications

(7 citation statements)

References 39 publications

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“…RSM is a statistical experimental design used to establish a continuous variable surface model, evaluate the influencing factors and their interactions of an indicator, determine the optimal level range, and require a relatively small number of experimental groups, which can save manpower and resources [36,37]. Therefore, this method has been successfully and widely applied.…”

Section: Analysis Of Response Surfacementioning

confidence: 99%

Study on Performance Optimization of Water-Rich Grouting Materials Based on Response Surface Methodology

Li,

Han,

Wang

et al. 2023

Processes

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The quality of borehole sealing is a key factor affecting the efficiency of gas production. A new water-rich grouting material (RW) with composite coagulant and other additives was prepared in this study to overcome the disadvantages of long setting time and low stone rate of traditional cement materials. When the coagulants A is 4 g and coagulants B is 2 g, the setting time of RW material was reduced by 60.85% and 50.62%, which significantly shortened the setting time of the RW material, respectively. Based on the orthogonal method, 29 groups of comparative experiments were designed to investigate the interaction mechanism between different additives on the performance index of RW, including setting time, water secretion rate, and compressive strength. Quadratic regression equations were fitted using the response surface method. All the correlation coefficients R2 of each response model were greater than 0.97, R2 and R2adj were less than 0.2 through variance analysis, indicating a high correlation between the actual and prediction results. The water–cement ratio had the most significant effect among all factors on setting time, water secretion rate, and compressive strength of the RW material. The scanning electron microscope (SEM) was used to compared the micromorphological characteristics of RW and conventional Portland cement material (PC). The results showed that the hydration products of RW were mostly smack ettringite, calcium silicate hydrate gel, and calcium hydroxide, which interweaved with each other to form a network structure that was denser than the PC material. Furthermore, the interface bonding degree between RW and injected coal was tighter than that of PC, without obvious cracks at the slurry–coal interface. The results indicate that the addition of composite coagulant can significantly accelerate the hydration process of RW material and also enhance the interface strength of injected coal, which is conducive to improving the grouting quality and sealing effect of the extraction borehole.

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Section: Analysis Of Response Surfacementioning

confidence: 99%

Study on Performance Optimization of Water-Rich Grouting Materials Based on Response Surface Methodology

Li,

Han,

Wang

et al. 2023

Processes

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“…Similarly, a small number of crystal clusters of CaCO 3 can be observed in Figure 5f, mainly due to higher CO 2 concentrations or shortterm carbonation. With further hydration of the cement, the polymer particles within the capillaries gradually agglomerated and flocculated together, forming a close layer on the surface of the cement gel [23,24]. In particular, the water between the polymer particles was absorbed to participate in the cement hydration, leading to the complete condensation and closure of the polymer particles on the mixture surface to form a continuous polymer reticular film.…”

Section: (4) Resistance To Chloride Ion Permeabilitymentioning

confidence: 99%

Mechanical Performance and Strengthening Mechanism of Polymer Concretes Reinforced with Carbon Nanofiber and Epoxy Resin

Li,

Liu,

Gao

et al. 2023

Coatings

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To address the issues of the brittleness, low tensile strength, insufficient bond strength, and reduced service life associated with ordinary cement concrete being used as a repair material, a water-based epoxy (WBE) and carbon-nanofiber-reinforced concrete composite repair material was designed, and the mechanical properties, bonding performance, and durability of the concrete modified using WBE and carbon fiber under various WBE contents were investigated and evaluated. In this paper, a self-emulsifying water-based epoxy curing agent with reactive, rigid, flexible, and water-soluble chains was obtained via chemical grafting, involving the incorporation of polyethylene glycol chain segments into epoxy resin molecules. The results demonstrated that a WBE has a contributing effect on improving the weak interfacial bond between the carbon fiber and concrete; moreover, the composite admixture of carbon fiber and WBE improves the mechanical properties and durability of concrete, in which the composite admixture of 1% carbon fiber and 10% WBE has the best performance. The flexural strength and chlorine ion permeability resistance of concrete were slightly reduced after more than 10% admixture, but bond strength, tensile strength, compressive strength, dry shrinkage resistance, and frost resistance were promoted. The addition of WBE significantly retards the cement hydration process while greatly improving the compactness and impermeability of the concrete. Furthermore, the combined effects of WBE and carbon fiber effectively prevented the generation and expansion of cracks. The interaction mechanism and microstructure evolution between the WBE, carbon fiber, and cement hydration were described by clarifying the mineral composition, organic–inorganic interactions, the evolution of the hydration products, and composite morphology at different scales. Carbon fiber and WBE exhibited synergistic effects on the tensile strength, ductility, and crack resistance of concrete. In the formed three-dimensional network structural system of concrete, the WBE formed an organic coating layer on the fiber surface and provided fiber protection as well as interfacial bonding reinforcement for the embedded cement particles.

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“…Li et al [12] and Yan et al [13] analyzed the reaction mechanism of acrylic grouting materials and added different types of accelerators to prepare various acrylic slurries with a strong stability and impermeability. Wang et al [14], Wang et al [15], and Liu et al [16] investigated the film-forming status of a high-permeability epoxy slurry and its penetration depth into concrete. Nautts [17], Saleh et al [18], and Hao et al [19] reported that polyurethane materials have a high degree of curing and strong erosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Properties and Microstructure of a Cement-Based Capillary Crystalline Waterproofing Grouting Material

Wang,

Yang,

Zheng

et al. 2024

Buildings

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Cement grout is traditionally used for treating water leakage distress in tunnels. However, traditional cement grout has the disadvantages of a poor anti-seepage performance, long setting time, and slow strength gain. To this end, a high-performance cement-based capillary crystalline waterproofing (CCCW) grouting material was synthesized using cement, capillary crystalline material, and several admixtures. The influences of the material proportions on the viscosity, bleeding rate, and setting time of the fresh grout, as well as the permeability coefficient of the grouted aggregate and the unconfined compression strength of the hardened grout material, were systematically studied. The mineralogy and microstructure of the CCCW grouting material were examined using X-ray diffraction, industrial computed tomography, and scanning electron microscopy. The results indicated that the capillary crystalline material PNC803 was not suitable for mixing with bentonite, sodium chloride, and triethanolamine in cementitious slurries, but it can produce excellent synergistic effects with sulfate, calcium chloride, and triisopropanolamine. An analysis of the microstructure of the CCCW grouting material showed that the PNC803 and additives can promote the hydration of cement, which yields more hydration products, sealing water passage and filling micro voids and therefore leading to enhanced waterproofing and strengthening effects. These research results could improve the applicability of CCCW material in tunnel engineering.

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Experimental analysis of Nano-SiO2 modified waterborne epoxy resin on the properties and microstructure of cement-based grouting materials

Cited by 34 publications

References 39 publications

Study on Performance Optimization of Water-Rich Grouting Materials Based on Response Surface Methodology

Study on Performance Optimization of Water-Rich Grouting Materials Based on Response Surface Methodology

Mechanical Performance and Strengthening Mechanism of Polymer Concretes Reinforced with Carbon Nanofiber and Epoxy Resin

Properties and Microstructure of a Cement-Based Capillary Crystalline Waterproofing Grouting Material

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