A cleaner material production by the incorporation of the rockwool waste into portland cement matrices

Medeiros, Maiara Goulart; Nadaleti, Willian Cezár; Rocha, Janaíde Cavalcante; Cheriaf, Malik; Gleise, Philippe Jean Paul; Castilhos, Armando Borges de

doi:10.1016/j.jclepro.2021.126059

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…Cement paste microstructure and morphology can be tracked via SEM analysis of changes in the C-S-H phase of hydration [18][19][20]. Also, SEM analysis can be used to characterize the pore structures in porous materials by calculating the total porosity and pore size distributions.…”

Section: Sem Analysismentioning

confidence: 99%

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

2022

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The use of calcined kaolin (CK) as a cementitious material in construction has attracted the interest of various researchers due to its environmental, mechanical, and physical qualities, all of which contribute to the lowering of cement usage. Studies have reported numerous problems associated with its use in concrete, apart from the ecological benefit that CK can provide. For instance, there is an issue of increased water demand due to smaller particle size, which generates much more heat in concrete, which has a detrimental effect on the mechanical and physical properties of concrete. This paper presents the analysis of an investigation aimed at using gum Arabic (GA) as a biopolymer admixture and calcined kaolin as a partial replacement of cement to improve the mechanical properties and durability of concrete. GA proportions ranged from 0 to 1% by weight of cement. Calcined kaolin (CK) was used to replace 5, 10, 15, 20, 25, and 30% of the cement content, respectively. Compressive strength, splitting tensile strength, density, strength loss, and weight loss tests were all performed to validate the structural performance of the modified concrete. The compressive tests, performed after 28 days from the time the mixture was made, demonstrated that the maximum percentage of CK that could replace cement without affecting the mechanical properties of concrete was 20%. Beyond 20%, concrete does not exhibit good compressive strength properties. The results also revealed decreased compressive strength and splitting tensile strength tests as the percentage of CK increased. After 56 days, compressive strength at 5% CK and 10% CK increased slightly by 0.743% and 1.162 %, respectively, compared to the control sample. The inclusion of 0.8%GA increased the compressive strength by 8.94% compared to the control sample (0%CK + 0%GA + 100%OPC) after 56 days. The results of durability tests showed that 0.6% GA had a higher compressive strength than other percentages containing GA. Doi: 10.28991/CEJ-2022-08-05-010 Full Text: PDF

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Section: Sem Analysismentioning

confidence: 99%

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

2022

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“…7 In addition, CS belongs to Class II industrial solid waste according to the hazardous waste identification standards of China (GB 5085.7-2007). 8 Therefore, resource utilization and green treatment of CS will be imminent. At the same time, finding a new pathway for high-value utilization of CS is of great significance to promote the development of polyvinyl chloride and acetylene industries.…”

Section: Introductionmentioning

confidence: 99%

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

Ren

Chen

et al. 2023

React. Chem. Eng.

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“…The production process is conducted at a high temperature. Rockwool is sterile and non-toxic and is made of basalt, dolomite, and other raw materials via melting, high-speed centrifugation, blowing gas into flocculent fibers, and the addition of phenolic resin and other adhesives via pendulum, wrinkling, drying, and other technical processes [11]. Rockwool is light in texture, with a porosity of 90-96%.…”

Section: Introductionmentioning

confidence: 99%

Is Rockwool Potentially Harmful to the Soil Environment as a Nursery Substrate? Taking Eisenia fetida as an Example for Toxicological Analysis

Zheng,

Wang,

et al. 2023

Agriculture

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We studied the effect of rockwool matrix on the conventional physical and chemical properties of soil and analyzed its toxicological effect on Eisenia fetida. The physical and chemical properties of rockwool were studied with characterization tests. By measuring earthworm enzymes and earthworm intestinal microorganisms, the effects of different rockwool particle sizes and additive amount on Eisenia fetida were analyzed. The results indicate that a low concentration of rockwool (<30 g/kg) had little effect on the soil physicochemical properties and the activity of Eisenia fetida, and played a positive role in improving the soil porosity. A high concentration of rockwool (>100 g/kg) reduced the exchangeable Ca and Mg content in the soil, and had a significant impact on the enzyme activity of Eisenia fetida. Mechanism studies have shown that high concentrations of rockwool (>200 g/kg) can have a significant impact on the nervous system of earthworm tissue. In addition, small particle size and low concentration of rockwool is conducive to the increase in intestinal microbial species of Eisenia fetida. This study clarifies the effects of emerging rockwool substrates on soil and soil organisms and provides theoretical support for the safe and reliable application of rockwool substrates in agricultural production.

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A cleaner material production by the incorporation of the rockwool waste into portland cement matrices

Cited by 17 publications

References 14 publications

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

Is Rockwool Potentially Harmful to the Soil Environment as a Nursery Substrate? Taking Eisenia fetida as an Example for Toxicological Analysis

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