Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements

Yang, Tao; Zhang, Zuhua; Zhu, Huajun; Zhang, Wei; Yong-liang, Gao; Wu, Qisheng

doi:10.1016/j.conbuildmat.2019.03.245

Cited by 37 publications

(30 citation statements)

References 55 publications

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“…Thus, a higher LBD content promotes dissolution. A similar heat evolution enhancement was observed in a previous study of an AAS system with dolomite [28,44]. Yang et al [28] found that the increase in heat evolution with LBD was due to the hydration procedure for LBD.…”

Section: Resultssupporting

confidence: 82%

“…Regardless of OPC content, all AAS mixtures with 20% LBD had the greatest hydrotalcite, C-A-S-H gel, and carbonate salt mass loss fraction among the specimens that included LBD. Yang et al [44] found that, using calcined dolomite consumes CO 3 2- ions to produce the hydrotalcite phase, and then increases the alkalinity to accelerate C-A-S-H gel formation.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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This study investigates the potential of light-burnt dolomite (LBD) as a supplementary cementitious material with ground granulated blast furnace slag (GGBFS) and Ordinary Portland cement (OPC). In this work, LBD was substituted for up to 20% of GGBFS in sodium sulfate-activated slag systems. The effects of LBD incorporation on the flow, setting time, compressive and flexural strength development, and drying shrinkage were explored with, X-ray diffraction and thermogravimetric analyses. LBD incorporation resulted in greater strength development of an alkali-activated slag system. The optimum LBD content for strength development was 10%, regardless of ordinary Portland cement content. In addition, LBD decreased the drying shrinkage, accelerated the hydration process, and induced hydrotalcite formation, which can be attributed to the reactive MgO inside LBD.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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“…As stated in the introduction, most of the works considered the use of carbonate powders only as filler added to the raw powders traditionally used in the alkali activation process [50,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]; only two works investigated the use of carbonates alone [40,45]. In particular, carbonate fines have been used in combination with MK [50,55,57,67], FA [58,59,62,65,66,68], GBFS [56,59,61,65,[68][69][70]72], and clays (bentonite [60], smectite [64], halloysite [71], undefined [65]).…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

“…The main difference among all the studied carbonate stone powders is the calcite and/or dolomite content, resulting in a different chemical composition that can be mainly expressed in terms of CaO and MgO content (Table 3). Indeed, articles can be summarized in three different groups according to the chemical nature of the starting minerals: mainly composed of calcite [45,[55][56][57][58]60,[63][64][65][66][67][68][69][70][71][72], with prevailing dolomite content [50,55,[59][60][61][62] and a mixture of calcite and dolomite [72].…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

et al. 2020

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This review aims to provide a comprehensive assessment concerning alkali activation of natural stone wastes and minerals. In particular, the structure of the review is divided into two main sections in which the works dealing with alumino-silicate and carbonatic stones are discussed, respectively. Alumino-silicate stones are generally composed of quartz and feldspars, while carbonatic stones are mainly made of calcite and dolomite. The role of these minerals in the alkali activation process is discussed, attesting their influence in the development of the final product properties. In most of the works, authors use mineral additions only as fillers or aggregates and, in some cases, as a partial substitution of more traditional raw powders, such as metakaolin, fly ash, and granulated blast furnace slag. However, a few works in which alumino-silicate and carbonatic stone wastes are used as the main active components are discussed as well. Not only the raw materials, but also the entire alkali activation process and the curing conditions adopted in the literature studies here reviewed are systematically analyzed to improve the understanding of their effect on the physical, mechanical, and durability properties of the final products and to eventually foster the reuse of natural stone wastes for the purposes of sustainability in different applications.

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“…Various types of SCMs, including industrial byproducts of fly ash, blast furnace slag and other metallurgical slags, have been used in concrete production for many years [ 10 , 11 , 12 , 13 ]. Although the industrial byproducts are commonly regarded as promising green SCMs, the inconsistent property of industrial byproducts is still one of the critical issues to be faced in large-scale deployment [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Strengths, Microstructure and Nanomechanical Properties of Concrete Containing High Volume of Zeolite Powder

Yang

Zhan

et al. 2020

Materials

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In order to save resources and reduce the carbon footprint of concrete, the addition of high volumes of supplementary cementitious materials (SCMs) to replace cement is one of the most effective and promising methods. Zeolite powder (ZP), with a high specific surface area, exhibits high pozzolanic reactivity in cement-based materials. This paper investigates the effects of ZP addition used to replace cement at the levels of 20%, 40% and 60% on the strength development and microstructure evolution of concrete, and the nanomechanical properties are analyzed using nanoindentation technique. The results show that the replacement of ZP for cement generally has a dilution effect on the concrete, leading to a detrimental effect on the strength development. However, the 20% ZP replacement for cement slightly enhances the 90-day compressive strength. The pore structure analysis shows that the sample with 20% ZP content has a lower total porosity than the control sample. The hydration of ZP goes against the dilution effect and reduces the total porosity of concrete to compact the microstructure. Nanoindentation investigation of the matrix shows that 20% ZP decreases the content of portlandite but increases the content of high density calcium silicate hydrate (C-S-H). This is beneficial for improving the nanomechanical properties of interface transition zone. However, further increases in the content of ZP (40% and 60%) decrease the total volume of C-S-H and increase the porosity to degrade the microstructure.

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Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements

Cited by 37 publications

References 55 publications

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

Strengths, Microstructure and Nanomechanical Properties of Concrete Containing High Volume of Zeolite Powder

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