Influence of new hydrophobic agent on the mechanical properties of modified cemented paste backfill

Yan, Bingqian; Ren, Fenhua; Cai, Meifeng; Qiao, Chen

doi:10.1016/j.jmrt.2019.09.039

Cited by 28 publications

(7 citation statements)

References 22 publications

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“…e hydrophobic admixture may be associated with minor airentraining effect, which increased the porosity in the hardened cement mortar [16].…”

Section: Effects Of Silane-based Admixture On Compressivementioning

confidence: 99%

“…Furthermore, enhancing the hydrophobic properties of LCC can be an added value since one of the main challenges encountered in façade wall application is surface staining due to weathering [14]. Hydrophobic properties can be achieved by using a hydrophobic agent during the mixing stage [15,16] or water repellent coating [17]. However, the surface coating method can become more vulnerable under UV radiation [18].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Lightweight Cementitious Composite Reinforced with Different Fibre Types and the Effect of Silane‐Based Admixture

Leong

Chua

et al. 2021

Advances in Civil Engineering

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This study aims to develop a type of fine-grained lightweight concrete, also known as lightweight cementitious composite (LCC), containing perlite microsphere (PM) and fibres with enhanced impermeability. The effect of polypropylene (PP), polyvinyl alcohol (PVA), and basalt fibres on the fresh and hardened properties of LCC was investigated. Besides, silane-based water repellent admixture was incorporated to reduce the water absorption and enhance the hydrophobicity of LCC. The dry densities of LCC developed were in the range of 912–985 kg/m3. PP fibres have lesser influence on the strengths of LCC. However, PVA fibres enhanced the strength of LCC by up to 35.2% and 28% in the compressive strength and flexural strength, respectively, while the basalt fibres increased both strengths up to 30.1% and 43.5%, respectively. By considering the overall performance, LCC with 0.5% PVA fibres has achieved a good balance in workability and strength. Additionally, silane-based water repellent admixture had an excellent effect in reducing the water absorption and improving the hydrophobicity of LCC. By incorporating 1% of silane-based water repellent admixture, the LCC with 0.5% PVA fibres obtained water-resistant properties with the softening coefficient of 0.85 and water contact angle of 128.2°. In conclusion, a combination of PVA-LCC with 1% waterproofing admixture showed the best performance in terms of mechanical strength as well as hydrophobic properties and had the potential to be used in the fabrication of concrete façade.

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“…e hydrophobic admixture may be associated with minor airentraining effect, which increased the porosity in the hardened cement mortar [16].…”

Section: Effects Of Silane-based Admixture On Compressivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Study of Lightweight Cementitious Composite Reinforced with Different Fibre Types and the Effect of Silane‐Based Admixture

Leong

Chua

et al. 2021

Advances in Civil Engineering

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“…The experimental results showed that the optimal ratio of the new CPB in the coal mine is a 6:2:1 quality ratio of gangue, laterite, and cement, and the slurry concentration is 80%, which not only meets the transportation requirements of the filling process, but also reduces the filling cost. Yan B et al [25] found that to improve the working performance of CPB and the efficiency of field engineering, mixed hydrophobic agents incorporated into CPB mud enhance the dewatering efficiency. Khaldoun et al [26] introduced the characterization and formulation validation of a waste-priced solution in operation using CPB techniques.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Microstructure of Alkali-Activated Rice Husk Ash-Granulated Blast Furnace Slag Tailing Composite Cemented Paste Backfill

Wang

Sun

et al. 2022

Materials

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At present, the research on rice hull ash and cement-based materials as cementitious materials continues to deepen. Low-cost rice hull ash replaces part of Portland cement, which plays a dual role in saving material costs and improving environmental benefits. In this study, alkali-activated rice husk ash (RHA) and ground granulated blast furnace slag (GGBS) were used to prepare cementitious material. The influence of RHA dosage on the strength, slump degree, and coagulation time of cementitious material was studied. On this basis, tailing was used as an aggregate based on the orthogonal design method and the bone–gel ratio, modulus, and alkali content were taken as variable factors, with strength and slump degree taken as the targets. A new cemented paste backfill (CPB) was prepared and mix ratio optimization was carried out. The strength formation mechanism of cementitious material and CPB was explored by combining scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results of this study show that with the increase in RHA mixing, the unconfined compressive strength (UCS) of the gelling material purification slurry showed a tendency first to increase and then decrease. When the amount of RHA was about 10%, the internal structure became denser, more C-S-H gel was generated, and greater strength could be obtained. The specific surface area of RHA is high, and a small amount of RHA can fill the internal pores, making the internal structure of concrete more dense. The active silica content in RHA is relatively high. The addition of RHA can appropriately improve the strength of the material, which is of certain significance to our material research. Finally, the micro-analysis of RHA-GGBS clean slurry, the analysis of influencing factors of fluidity and strength, and the optimal mix proportion of alkali-activated RHA-GGBS-based backfill are put forward.

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“…Others used numerical simulation to study the influence of loose layer thickness/base rock thickness, buried depth/coal thickness, and three mechanical parameters of tensile strength, cohesion, and internal friction on ground subsidence [18][19][20][21][22]. Some have analyzed the stability of the key water-proof layer of the filling working face through theoretical analysis, numerical simulation, and actual measurement, and they revealed the crack height and change law of the overburdened rock under the thin base rock and thick loose layer [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Strata Movement of the Thick Loose Layer under Strip-Filling Mining Method: A Case Study

et al. 2021

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Filling mining plays an important role in controlling surface subsidence. To study the movement of overburdened rock in filling mining under thick loose layers, a numerical simulation combing field measurement in CT30101 working face in the Mahuangliang coal mine was tested. The results show that different filling rates and filling body strength have different influences on roof and surface movement. The filling rate has a greater impact, which is the main control factor. The filling stress and roof tensile stress decrease gradually with roadway filling. The filling body stress and roof tensile stress in the first and second rounds are far greater than in the fourth round. After the completion of filling, the first and second round of filling bodies mainly bear the overburden, and the total deformation of the surrounding rock of the main transport roadway is very small, and therefore the displacement of the overburdened rock is controllable. The field monitoring results also show that the overburdened rock became stable after several fillings rounds. Combing the numerical modeling and field tests results, this study can be a guideline for similar geological conditions especially for coal mining under thick loose layers and thin bedrock.

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Influence of new hydrophobic agent on the mechanical properties of modified cemented paste backfill

Cited by 28 publications

References 22 publications

Comparative Study of Lightweight Cementitious Composite Reinforced with Different Fibre Types and the Effect of Silane‐Based Admixture

Comparative Study of Lightweight Cementitious Composite Reinforced with Different Fibre Types and the Effect of Silane‐Based Admixture

Preparation and Microstructure of Alkali-Activated Rice Husk Ash-Granulated Blast Furnace Slag Tailing Composite Cemented Paste Backfill

Strata Movement of the Thick Loose Layer under Strip-Filling Mining Method: A Case Study

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