Effect of CaSO4 on hydration and phase conversion of calcium aluminate cement

Son, Han Seong; Park, Solmoi; Kim, H.Y.; Seo, Joonho; Seo, Joonho

doi:10.1016/j.conbuildmat.2019.07.004

Cited by 33 publications

(20 citation statements)

References 36 publications

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“…Although this class of cementitious materials exhibits mechanical performance comparable to ultra-high-strength concrete (compressive strength over 150 MPa), the employment in structural applications is severely limited by its high sensitivity to environmental conditions, resulting from phase conversion described above [ 21 ]. Moreover, CACs are 4–5 times more expensive than Portland cements and, therefore, do not compete in any application where conventional concrete performs satisfactorily [ 20 ].…”

Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

“…The sustainability and economic impact of SSC technology is dependent on the sourcing of raw materials. In recent years, the supply of blast furnace slag has proved problematic due to the closure/inactivity of blast furnaces and depletion of old piles of waste, resulting in high slag demand and the growing cost of aluminosilicate materials [ 21 ]. In this regard, alternative raw material sources (such as pozzolanic volcanic glassy rocks, fly ash, flue gas desulfurization gypsum) are being explored [ 23 , 26 ].…”

Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

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Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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In the direction of reducing greenhouse emissions and energy consumption related to the activities of the cement and concrete industry, the increasingly popular concept of eco-sustainability is leading to the development and optimization of new technologies and low impact construction materials. In this respect, geopolymers are spreading more and more in the cementitious materials field, exhibiting technological properties that are highly competitive to conventional Portland concrete mixes. In this paper, the mix design, mechanical properties, microstructural features, and mineralogical properties of geopolymer mixes are discussed, investigating the influence of the main synthesis parameters (curing regime, type of precursors, activator molarity, mix design) on the performance of the final product. Moreover, recent developments of geopolymer technology based on the integration of functional nanofillers are reported. The novelty of the manuscript is to provide a detailed collection of past and recent comparative studies between geopolymers and ordinary Portland concrete mixes in terms of strength properties, durability, fire resistance, and environmental impact by LCA analysis, intending to evaluate the advantages and limitations of this technology and direct research towards a targeted optimization of the material.

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Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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“…Generally, three stable hydrate phases of calcium sulfate can be observed—(i) gypsum (CaSO 4 ·2H 2 O), (ii) α‐hemihydrate (α‐CaSO 4 ·0.5H 2 O), and (iii) anhydrite (CaSO 4 ) 92 . Numerous studies have been conducted to evaluate the effect of sulfate type and amount on CSA cement, PC, and CAC cement as an individual or binary systems 45,89,93–110 . Typically, 2%–10% gypsum is added to PC clinker to control setting, and 16%–25% gypsum is added to CSA cement to control setting time, volume stability, and mechanical strength improvement 106,111 .…”

Section: Binder Compositionmentioning

confidence: 99%

“…92 Numerous studies have been conducted to evaluate the effect of sulfate type and amount on CSA cement, PC, and CAC cement as an individual or binary systems. 45,89,[93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110] Typically, 2%-10% gypsum is added to PC clinker to control setting, and 16%-25% gypsum is added to CSA cement to control setting time, volume stability, and mechanical strength improvement. 106,111 CAC cement does not typically contain any sulfate.…”

Section: Type and Amount Of C$mentioning

confidence: 99%

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

2023

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Ettringite-accelerated binders composed of CAC-PC-C$ (calcium aluminate cement-Portland cement-calcium sulfate) and CSA-PC-C$ (calcium sulfoaluminate cement-Portland cement-calcium sulfate) have been used widely for indoor applications, such as self-leveling floor screeds, underlayment, and tile adhesives owing to their rapid setting, early strength gain, and shrinkage compensation properties. These properties also make these binders appealing candidates for outdoor rapid repair (e.g., highways, bridge decks, and airfield pavements). However, a central question remains: Does ettringite remain stable in outdoor exposure conditions? If so, which factors will contribute positively/negatively to the long-term stability of ettringite in these systems? To address these questions, this critical review presents the current state of knowledge regarding the hydration of ternary binders composed of CAC-PC-C$ and CSA-PC-C$ with respect to ettringite formation and the factors affecting the stability of ettringite thereafter. The purpose of this review paper is to synthesize and analyze current research regarding conditions that promote or deter ettringite stability, establish what information is missing, unclear, or contradictory, and identify remaining research needs to address the identified knowledge gaps.

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“…Many scholars have researched how to solve this problem, such as mixing mineral admixtures (such as slag, fly ash, silica fume, limestone powder, etc.) into the aluminate cement system to improve the problem of its post-strength reduction [ 12 , 13 , 14 , 15 ]. The results showed that mineral admixtures could be suppressed to a certain extent on the crystal transition aluminate cement, certainly playing a helpful role in the late stability strength.…”

Section: Introductionmentioning

confidence: 99%

Study of the Electrical Properties of Aluminate Cement Adhesives for Porcelain Insulators

Wan

Liu

et al. 2021

Materials

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Electrical properties are one of the essential parameters of cement-based materials used in suspension porcelain insulators. This paper studied the electrical properties of aluminate cement adhesives (ACA) containing silica fume (SF), as well as their compressive strength and porosity. The results indicated that the addition of silica fume improved the resistivity of ACA under a saturated state (relative humidity is 50%). This was mainly attributed to the decrease of the ACA’s pore connectivity due to the SF’s filling effect. However, the early compressive strength of ACA was slightly reduced by the addition of SF. Under an unsaturated state, the ACA’s resistivity without the SF gradually exceeded that with the SF at the extension of drying time. The nuclear magnetic resonance (NMR) results indicated that the addition of SF content increased the ACA’s porosity; for the tiny pores especially, (the size less than 25 nm), this increased by 3.4%. Meanwhile, the addition of SF increased the tortuosity of the ACA’s conductive channels, which could improve its resistivity. Therefore, SF is recommended to be used in cement-based adhesives on insulators to lower the cost and improve the resistivity.

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Effect of CaSO4 on hydration and phase conversion of calcium aluminate cement

Cited by 33 publications

References 36 publications

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

Study of the Electrical Properties of Aluminate Cement Adhesives for Porcelain Insulators

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