Influence of superfine ettringite on the properties of sulphoaluminate cement-based grouting materials

Li, Haiyan; Guan, Xiaohong; Zhang, Xuyang; Ge, P.; Hu, Xingxing; Zou, Dinghua

doi:10.1016/j.conbuildmat.2018.02.013

Cited by 63 publications

(19 citation statements)

References 29 publications

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“…Besides, many nano-particles like nano-CuO, nano-SiO 2 , nano-TiO 2 , nano-Al 2 O 3 and nano-carbon tubes were used to modify and accelerate the hydration process of CSA cement-based grouting materials [15,16,17,18,19]. Ettringite could act as a role in destroying the structure in the cementitious system [20,21], but a recent study has shown that, for sulphoaluminate cement-based grouting materials, the addition of 4% superfine ettringite can increase the 4-hour compressive strength by 380% and shorten initial setting time by 55.6% [22].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, adding slaked lime and aluminum sulfate can promote the formation of ettringite and C-S-H in masonry mortar [38]. Theoretically, as in Equation (7), the addition of aluminum sulfate to the slurry B can form ettringite, and the ettringite can affect the double liquid grouting material [22]. The influence of aluminum sulfate amount and the quicklime/fluorgypsum ratio in slurry B on the properties of CSA cement based double liquid grouting materials was investigated through a set of tests including setting time, hydration heat, compressive strength, thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), and scanning electron microscope (SEM) tests.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Wang

Wang³

et al. 2019

Materials

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Grouting materials are used frequently in grouting reinforcement projects, such as mining and coastal engineering. Double liquid grouting materials are mostly used because of the fast setting and high early strength properties when the two slurries are mixed together but high fluidity when the two slurries are separated. In our study, double liquid grouting materials were developed from CSA cement (slurry A), quicklime and fluorgypsum (slurry B). Aluminum sulfate was added in slurry B in order to counteract any adverse effects caused by the fluorgypsum, such as the decreased early compressive strength and the prolonged setting time. The effects of aluminum sulfate content and the quicklime/fluorgypsum ratio on the setting time, hydration heat, and compressive strength of the double liquid grouting materials were investigated, and the hydration products were characterized through thermogravimetry-differential thermal analysis (TG-DTA), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) tests. The results show that the addition of aluminum sulfate can shorten the setting time and increase compressive strength at both early and later ages. Considering the setting time and compressive strength of double liquid grouting material at the same time, the optimum content of aluminum sulfate was found to be 2%, and the optimum ratio of quicklime/fluorgypsum was found to be 2:8. The values of the optimum content of aluminum sulfate and ratio of quicklime/fluorgypsum were verified from theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Wang

Wang³

et al. 2019

Materials

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“…Blaine fineness of sulfoaluminate clinker and anhydrite was 350 and 365 m 2 kg À1 , respectively, as reported in our previous study. 2 The mineralogical, chemical composition of sulfoaluminate cement clinker and anhydrite determined X-ray fluorescence is provided in Tables 1 and 2, respectively. Naphthalene water reducer and sodium gluconate were purchased from Dinghao Technology Co. Ltd (Henan Province, China).…”

Section: Methodsmentioning

confidence: 99%

“…Cement-based grouting materials (CBGMs) are usually applied in repair and consolidation and the suspension consists of cement, admixture, water, and possibly, gypsum or anhydrite. 1,2 The properties of grouting material are very important in grouting engineering. The ideal grouting material should have good fluidity during the pumping process and high compressive strength at the place need to be reinforced.…”

Section: Introductionmentioning

confidence: 99%

Effect of water-to-binder ratio on the properties of CSA cement-based grouting materials with LiAl-LDH

Yang

Guan

2020

Advanced Composites Letters

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The compressive strength of sulfoaluminate cement-based grouting materials (CBGMs) cannot meet the requirement of repair and reinforcement engineering in the presence of high water-to-binder ratio (w/b) of 0.5-1.2. Using nanotechnology, the mechanical property of the CBGM paste at different ages can be improved and our previous experimental results showed that lithium aluminum layered double hydroxides (LiAl-LDHs) with nanostructure can significantly increase the compressive strength of CBGM paste. In addition to the characteristics of nanomaterials, the performance of nanomaterials is also related to w/b of paste. In this work, the effect of w/b ratio on the compressive strength, hydration process, and products of calcium sulphoaluminate cement (CSA) CBGMs with and without LiAl-LDH was studied. Results indicate that with the increase of w/b from 0.6 to 1.0, the growth rate of compressive strength of CBGM paste with LiAl-LDH enhanced. Moreover, LiAl-LDH enhanced total hydration heat more effectively at a higher w/b and as the w/b increased from 0.6 to 1.0, the growth rate of hydration product boosted, which is the reason why the enhancement ratio of compressive strength of the paste was larger at high w/b.

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“…The addition of 8% of PG in EP3 and ES3 mixtures shows two small endothermic peaks at 128 • C and 152 • C, which the latter corresponds to a loss of water molecules from ettringite crystal in the samples [56]. The endothermic peak at 470-545 • C can be attributed to the decomposition of calcium hydroxide to the lime with the following reaction:…”

Section: Dsc Analysismentioning

confidence: 97%

Phosphogypsum and Black Steel Slag as Additives for Ecological Bentonite-Based Materials: Microstructure and Characterization

et al. 2020

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The Black Steel slag (Ss) and phosphogypsum (PG) are industrial wastes produced in Morocco. In order to reduce these two wastes and to evaluate their pozzolanic reactivity in the presence of water, they were incorporated into bentonite (B) mixed with lime (L). The studied mixtures (BLW, BL–PG–W and BL–PG–Ss–W) were analyzed by X-ray diffraction, Infrared spectroscopy, Raman spectroscopy and SEM/EDX analysis. Compressive strength tests were performed on hardened specimens. The results obtained show that the hydration kinetics of the B–L–W and B–L–PG–W mixtures are slow. The addition of PG to a bentonite––lime mixture induces the formation of new microstructures such as hydrated calcium silicate (C–S–H) and ettringite, which increases the compressive strength of the cementitious specimens. The addition of the Ss to a mixture composed of 8%PG and 8%L–B accelerates the kinetics of hydration and activates the pozzolanic reaction. The presence of C2S in the slag helps to increase the mechanical strength of the mixture B–L–PG–Ss. The compressive strength of the mixtures BL–W, BL–PG–W and BL–PG–Ss–W increases from 15 to 28 days of setting. After 28 days of setting, 8% of Sc added to the mixture 8% PG–8%L–B is responsible for an increase of the compressive strength to 0.6 MPa.

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Influence of superfine ettringite on the properties of sulphoaluminate cement-based grouting materials

Cited by 63 publications

References 29 publications

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Effect of water-to-binder ratio on the properties of CSA cement-based grouting materials with LiAl-LDH

Phosphogypsum and Black Steel Slag as Additives for Ecological Bentonite-Based Materials: Microstructure and Characterization

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