Effect of Dry‐Wet Cycling on the Mechanical Properties of High‐Water Materials

Abstract

As a new grouting reinforcement material, high-water materials (HWMs) are being increasingly applied in different fields. This means that the environment in which these HWMs are employed are varied and increasingly complex. The dehydrating and saturation cycle of HWM caused by changes in the environment is referred to as the dry-wet cycle. To explore the influence of the dry-wet cycle on the mechanical properties of HWMs, uniaxial compression tests were performed on specimens with different water-to-cement ratios under different dry-wet cycles. The degradation rate of the peak stress and elastic modulus increased with an increase in the water-to-cement ratio. The failure mode of specimens changed from splitting failure to shear-splitting failure during the dry-wet cycle. The results of scanning electron microscope and X-ray diffraction showed that an HWM with a low water-to-cement ratio is relatively dense; therefore, the carbonization process is slow during dehydration. Raw materials were present after hydration and hardening reaction. Thus, the strength recovery ability is strong in materials with a low water-to-cement ratio during the saturation process. Finally, the experimental results can provide guidance for selecting materials with different water-to-cement ratios and control measures for dry-wet cycle can be determined according to different engineering environments.

Stratified damage characteristics of high‐water quick‐setting material exposed to sulfate under dry–wet cycles

“…The results show that the coupling effect has a more obvious effect on concrete damage than the sulfate attack 5–7 . The damage characteristics of the grouting materials under the sulfate attack and dry–wet cycles were also investigated 8,9 …”

“…[5][6][7] The damage characteristics of the grouting materials under the sulfate attack and dry-wet cycles were also investigated. 8,9 High-water quick-setting material (HWQSM) is a novel inorganic polymer grouting material reacted by the sulfoaluminate cement (SC), lime and gypsum mixture (LG), retarder (R), and early strength agent (ESA). 9 HWQSM was initially used in mine filling due to its ultra-high water content.…”

“…8,9 High-water quick-setting material (HWQSM) is a novel inorganic polymer grouting material reacted by the sulfoaluminate cement (SC), lime and gypsum mixture (LG), retarder (R), and early strength agent (ESA). 9 HWQSM was initially used in mine filling due to its ultra-high water content. 10 Currently, HWQSM is gradually used in waterrich infrastructures as the grouting material due to the advantages of early setting strength, fast setting speed, and high moisture content compared with traditional Portland cement grouting materials.…”

Development of Modified Grouting Material and Its Application in Roadway Repair Engineering

“…As the key and core factor, the comprehensive performance of grouting material will significantly affect the flow and diffusion range of slurry and ultimately determine the grouting reinforcement effect of the roadway. At present, many scholars have carried out effective research on grouting materials and developed grouting materials with different types and properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. It can be divided into inorganic cement slurry and organic chemical slurry: (1) Inorganic cement slurry has the advantages of wide source, high strength of stone body, good impermeability, low price, convenient preparation, simple operation, nontoxic, and harmless.…”

Stability Analysis and Control Technology of Gob-Side Entry Retaining with Double Roadways by Filling with High-Water Material in Gently inclined Coal Seam

“…However, due to the shortcomings of traditional roadside supports such as resistance and shrinkage cannot adapt to the large deformation of surrounding rock, supports cannot effectively isolate the goaf and difficult to achieve high mechanization, it has been gradually eliminated. The new high-water material has several characteristics (Li and Liu 2018;Wu et al 2020;Zhou et al 2020) such as obvious plastic characteristic, quick solidification, fast increase of the resistance, high strength, a certain compression rate after curing, low cost and well adapt to the large deformation of surrounding rock of GER. In recent years, it has been gradually applied in roadside filling of GER in China.…”