Characterization on the recycling of waste seashells with Portland cement towards sustainable cementitious materials

Wang, Junjie; Liu, Engui; Li, Liang

doi:10.1016/j.jclepro.2019.02.122

Cited by 101 publications

(66 citation statements)

References 34 publications

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“…Given the formation of aluminum gel, when CaO and gypsum were added, they will react with the aluminum gel and form additional ettringite as shown in Equation (6). In order to reduce the use of nature resources [27,28,29,30,31,32,33,34] and increase the use of recycled materials [35,36,37], fluorgypsum was used in this study. Besides, adding slaked lime and aluminum sulfate can promote the formation of ettringite and C-S-H in masonry mortar [38].…”

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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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%

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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“…It was found that when the content of CaCO 3 whisker was in the range of 1.5-2.0%, its flexural strength and compressive strength increased by 27.59% and 12.60%, respectively. is is because CaCO 3 can not only improve the compactness of the cement matrix but also enhance the early hydration of cement [13][14][15]. However, when the amount of calcium carbonate whisker is more than 2%, its fluidity will decrease, and its initial consistency value is higher than 30B C , which is not conducive to cementing operation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid Activation-Hydrophilic-Modified Sepiolite on Comprehensive Properties of Oil-Well Cement

Zhang

et al. 2019

Journal of Chemistry

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In this paper, sepiolite was treated by acid activation, coupling agent treatment, and sulfonation modification. The purpose of this study was to explore the changes in the fluidity and mechanical properties of sepiolite cement slurry before and after modification. Therefore, the comprehensive properties of unmodified sepiolite fiber (HPS) and acid activation-coupling agent treatment-sulfonated sepiolite fiber (S-O-H-HPS) in oil-well cement slurry were evaluated. FT-IR and microscopic mechanism of cement paste fracture surface before and after sepiolite modification were analyzed. The results showed that HPS can effectively improve the toughness of cement paste, but when the content of HPS was more than 1%, the fluidity of cement paste deteriorated sharply and the compressive strength decreased gradually. The addition of S-O-H-HPS can significantly improve the fluidity and stability of HPS slurry. Without affecting the compressive strength, it can effectively improve the flexural strength and impact strength and reduce the elastic modulus of cement paste. The mechanism analysis showed that S-O-H-HPS can not only form network structure in cement paste but also improve the toughness of cement paste by forming a bridge. This also explains why the strength of S-O-H-HPS cement paste does not decrease significantly with the increase of S-O-H-HPS.

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“…[1][2][3] The potential availability of chitin is illustrated by the 6 to 20 million tons of crab, shrimp and lobster shells processed every year. 1,4 Such residual ocean biomass is usually landlled or directly dumped in coastal areas. Transforming such an abundant resource into valuable products has become a critical need.…”

Section: Introductionmentioning

confidence: 99%

Microfibers synthesized by wet-spinning of chitin nanomaterials: mechanical, structural and cell proliferation properties

et al. 2020

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Characterization on the recycling of waste seashells with Portland cement towards sustainable cementitious materials

Cited by 101 publications

References 34 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 Acid Activation-Hydrophilic-Modified Sepiolite on Comprehensive Properties of Oil-Well Cement

Microfibers synthesized by wet-spinning of chitin nanomaterials: mechanical, structural and cell proliferation properties

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