Expansion behavior and microstructure change of alkali-activated slag grouting material in carbonate environment

Liu, Leping; Xie, Maojia; He, Yan; Li, Yuanyuan; Wei, Anhua; Cui, Xuemin; Shi, Caijun

doi:10.1016/j.conbuildmat.2020.120593

Cited by 17 publications

(2 citation statements)

References 53 publications

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“…As an environmentally friendly material that has received increasing attention recently, alkali-activated slag (AAS) has received much attention from scholars due to its low energy consumption and low CO 2 emissions during the production process [12,[15][16][17]. AAS has the advantages of rapid development of mechanical strength [18,19], excellent corrosion resistance [20][21][22], and fire resistance [23]. Compared to alkali-activated, low calcium fly ash needs to be cured under heating conditions [24], and AAS can show better mechanical performance when just cured at room temperature [25,26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Borax, Sucrose, and Citric Acid on the Setting Time and Mechanical Properties of Alkali-Activated Slag

Chen²,

Jia

et al. 2023

Materials

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The setting time of alkali-activated slag (AAS) binders is extremely short, while traditional retarders of Portland cement may be invalid for AAS. To find an effective retarder with a less negative impact on strength, borax (B), sucrose (S), and citric acid (CA) were selected as potential retarders. The setting time of AAS with different admixtures dosages of 0%, 2%, 4%, 6%, and 8%, and the unconfined compressive strength and beam flexural strength of 3 d, 7 d, and 28 d AAS mortar specimens were tested. The microstructure of AAS with different additives was observed by scanning using an electron microscope (SEM), and the hydration products were analyzed by energy dispersive spectroscopy (EDS), X-ray diffraction analysis (XRD), and thermogravimetric analysis (DT-TGA) to explain the retarding mechanism of AAS with different additives. The results showed that the incorporation of borax and citric acid could effectively prolong the setting time of AAS more than that of sucrose, and the retarding effect is more and more obvious with the increase in borax and citric acid dosages. However, sucrose and citric acid negatively influence AAS’s unconfined compressive strength and flexural stress. The negative effect becomes more evident with the increase in sucrose and citric acid dosages. Borax is the most suitable retarder for AAS among the three selected additives. SEM-EDS analysis showed that the incorporation of borax does three things: produces gels, covers the surface of the slag, and slows down the hydration reaction rate.

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Section: Introductionmentioning

confidence: 99%

Effects of Borax, Sucrose, and Citric Acid on the Setting Time and Mechanical Properties of Alkali-Activated Slag

Chen²,

Jia

et al. 2023

Materials

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“…Although there is extensive research on grouting materials, it mainly focuses on cement as the main grouting material [ 13 ], which is improved by composite fiber and other mineral additives [ 14 , 15 ]. Under challenges of high ground pressure, high water pressure, high ground temperature, and the complex geological structure of ultra-deep well aquifer rock, cement-based grouting materials often cannot meet engineering needs in terms of setting time, mechanical properties, and consolidation properties [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Coagulation Mechanism and Compressive Strength Characteristics Analysis of High-Strength Alkali-Activated Slag Grouting Material

Huang

Cui

et al. 2022

Polymers

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In deep coal mining, grouting reinforcement and water blockage are the most effective means for reinforcing the rock mass of extremely broken coal. However, traditional cement grouting materials are not suitable for use in complex strata because of their insufficient early mechanical strength and slow setting time. This study innovatively proposes using alkali-activated grouting material to compensate for the shortcomings of traditional grouting materials and strengthen the reinforcement of extremely unstable broken coal and rock mass. The alkali-activated grouting material was prepared using slag as raw material combined with sodium hydroxide and liquid sodium silicate activation. The compressive strength of specimens cured for 1 d, 3 d, and 28 d was regularly measured and the condensation behavior was analyzed. Using X-ray diffraction and scanning electron microscopy, formation behavior of mineral crystals and microstructure characteristics were further analyzed. The results showed that alkali-activated slag grouting material features prompt and high strength and offers the advantages of rapid setting and adjustable setting time. With an increase in sodium hydroxide content, the compressive strength first increased (maximum increase was 21.1%) and then decreased, while the setting time continued to shorten. With an increase in liquid sodium silicate level, the compressive strength increased significantly (and remained unchanged, maximum increase was 35.9%), while the setting time decreased significantly (and remained unchanged). X-ray diffraction analysis identified the formation of aluminosilicate minerals as the main reason for the excellent mechanical properties and accelerated coagulation rate.

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Experimental investigation of expansion behavior and uniaxial compression mechanical properties of expansive grout under different constraint conditions

Yao

Deng

Wang

et al. 2021

Bull Eng Geol Environ

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Expansion behavior and microstructure change of alkali-activated slag grouting material in carbonate environment

Cited by 17 publications

References 53 publications

Effects of Borax, Sucrose, and Citric Acid on the Setting Time and Mechanical Properties of Alkali-Activated Slag

Effects of Borax, Sucrose, and Citric Acid on the Setting Time and Mechanical Properties of Alkali-Activated Slag

Coagulation Mechanism and Compressive Strength Characteristics Analysis of High-Strength Alkali-Activated Slag Grouting Material

Experimental investigation of expansion behavior and uniaxial compression mechanical properties of expansive grout under different constraint conditions

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