19.2. Deteriorating effect of acid on alkali-activated concretes. Concrete is in imbalance with its environment due to its alkaline structure. In order for hydrated compounds to be stable, Ca 2+ and OH − ions must be in the appropriate concentration range. As the pH of the solution that alkali-activated concretes are exposed to …
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The utilization of gypsum reinforced composites as building materials has garnered considerable attention owing to their exceptional amalgamation of mechanical strength, fire resistance, and versatile applications. This review initiates by introducing gypsum as a pivotal mineral in construction, subsequently exploring the concept of …
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The urgent requirement to reduce greenhouse gas emissions during Portland cement production and to enhance the durability of concrete in destructive environments are essential reasons to seek other alternative materials like alkaline activated binders. In this study, the feasibility of producing durable alkali-activated slag …
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1. Introduction. Gypsum is a material widely employed in the construction industry due to its excellent properties such as low thermal conductivity, light weight, fire resistance, and relative ease of handling [1], [2].Phosphogypsum, a byproduct from the processing of phosphate rock, is chemically similar to natural gypsum and holds a …
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The gypsum specimens are prepared in compliance with the "Building Gypsum" standard (GB/T9776:2022). Succinic acid, malic acid, and L-aspartic acid are utilized as crystallization agents for α-HH. ... malic acid, and L-aspartic acid on the water resistance of α-HH converted from PG follows the order of malic acid > L-aspartic acid …
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The use of phosphogypsum waste in the production of building industry products, as well as for obtaining building gypsum is one of the most promising directions in the utilization of this mass ...
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The research produced a new eco-friendly, high-strength, water-resistant building material by using the simplest mechanical method of pressing phosphogypsum. The compressive strength of the blocks was higher than 80 MPa and the flexural strength was 5.5 MPa when the pressure was 300 MPa and the placing time …
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DOI: 10.1016/J.CONBUILDMAT.2020.122170 Corpus ID: 233634265; Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance @article{Zhang2021RecyclingFG, title={Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid …
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Peng Jiahui et al. [8], for instance, studied the influencing factors of citric acid on the retardation of building gypsum. The results showed that pH and temperature had a great influence on retardation. Huang Yuyan et al. [9] found that black tea alters the gypsum hydration process, decreases the hydration rate and prolongs the setting times ...
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Gypsum blending in a ye'elimite rich CSA cement used in this study led to poorer acid resistance. Poorer resistance of gypsum-blended CSA cement was due to reduced amount of aluminium hydroxide and monosulfate. ... municipal sludge and kaolin clay in building brick manufacture: Crystalline transformation, morphology observation …
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This inherent fire resistance has made gypsum-based materials a staple in building codes and regulations, highlighting their vital role in creating safer environments …
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Effect of gypsum addition on acid resistance of Ye'elimite rich calcium sulfoaluminate cement. Home / ... Room 205, Building Sciences Block (BSB) Department of Civil Engineering Indian Institute of Technology Madras Sardar Patel Road, Adyar Chennai, Tamil Nadu - 600036, India.
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On 17 November 2023, the Indian Department for Promotion of Industry and Internal Trade (DPIIT) notified the World Trade Organization (WTO) of the Gypsum Based Building Materials Quality Control Order, 2023. The final day for comments is 60 days from the date of notification. Gypsum-Based Building Materials . The most commonly used …
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Specifically, a method for calculating a fire-resistance rating for a gypsum board clad system has existed in model building codes for many years–most notably in the Uniform Building Code–and was integrated into the International Building Code (IBC) when it was first published in 2000. Unlike a fire rating established by a fire test, a fire ...
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The application of α-hemihydrate gypsum (α-HH) is limited by several factors, such as a rapid hydration rate, short setting time, poor water resistance, and high cost. Especially because of the high production cost, although α-HH has excellent mechanical strength, it is rarely used in the field of building materials. In this study, …
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With the rapid advancement of industrial production, the substantial accumulation of industrial by-product gypsum containing high salinity, acidity/alkalinity, …
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Effects of citric acid on setting times of building gypsum. Fig. 1 (a) and (b) show that all eight kinds of retarders play different degree on setting times for building gypsum, among which citric acid demonstrates the most significant retarding effect, followed by sodium tripolyphosphate. When the dosage of citric acid is only 0.1%, the ...
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Gypsum & Aluminium Ceiling Tiles/Boards & Fittings Kingdom of Middle East is the leading importers, distributors and retailers of building material supplies in the Sultanate of Oman. It specializes in Aluminum Extruded Profiles, Aluminum Accessories, Glass, Glass Accessories, Timber Products and hardware items.
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The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE ... cementitious materials; durability; ettringite; fly ash; gypsum; manufactured sand; microscopic. DOI: 10.14359/51718051. Date: 11/1/2019. ... Acid resistance was marginally reduced when 50% volume of sand was replaced by FNS. …
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The acid resistance of concrete specimens was influenced by the type of original aggregate used, regardless of whether it was natural or recycled aggregate. As depicted in Fig. 2, the G-NQ specimens, which utilized quartz aggregate, demonstrated superior acid resistance compared to those made with natural limestone (G-NL). …
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Section snippets Materials and mixtures. In this experimental work commercial gypsum plaster (β-hemihydrate – CaSO 4 ·0.5H 2 O), gypsum plaster waste (dihydrate – CaSO 4 ·2H 2 O) and citric acid as admixture was used. Commercial plaster is found in the market and the recycled gypsum plaster (RGP) was obtained from the …
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Salalah International Gypsum Co. L.L.C., or SIG in short, is the leading natural gypsum producer & exporter from Sultanate of Oman. We are located at Salalah in the Dhofar governorate, which is the southernmost part of Oman. Our gypsum mines are located at Thumrait, around 80 km from Salalah city. SIG's gate way to the world is the Port of ...
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Gypsum is a commonly used building material. It is characterized by its lower natural radioactivity in the group of mineral construction binding materials, as well as by its quick growth of strength …
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In addition to poor water resistance and high production cost, short setting time is also a problem faced by gypsum-based materials, so α-HH is not widely used in the field of building materials.
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Following a series of parametric tests, a new simplified design method for stone columns, in sabkha soils, for area replacement ratio, and stone column material …
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the concrete resistance to acids can also be provi ded by giving its surface an acid resistant coating. In Fig. 2, two ordinary concrete cylinders having the same mix design are shown. The cylinde ...
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In summary, through the synergistic hydration reaction and mutual excitation of the components, the performance of gypsum-based composite cementitious …
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1. Introduction. Gypsum, one of the most important cementitious materials, has been widely utilized for the construction of civil engineering, assistance in bone regeneration, retardation on cement, soil amendment, processing of building materials with multifunction, sculpting of art models and other application fields [[1], [2], [3]].There are …
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