Reaction mechanism of dolomite powder in Portland-dolomite cement

Xu, Jiangtao; Lu, Donghua; Zhang, Shaohua; Xu, Zhongzi; Hooton, RD

doi:10.1016/j.conbuildmat.2020.121375

Cited by 29 publications

(7 citation statements)

References 55 publications

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“…Comparative studies of limestone and dolostone [28,29] have demonstrated similar performance (grindability, hardness, strength). Dolostone stability was proven in cement paste containing reactive SCM [30].…”

Section: Fillersmentioning

confidence: 93%

Overview of cement and concrete production in Latin America and the Caribbean with a focus on the goals of reaching carbon neutrality

Zaccardi

Pareja²,

Rojas³

et al. 2022

RILEM Tech Lett

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Carbon neutrality to limit global warming is an increasing challenge for all industries, particularly for the cement industry, due to the chemical emission of the process. For decades, reducing the clinker factor has been one of the main strategies to reduce the carbon footprint. Additional cuttings in the clinker content of cements seem possible with the upsurge of novel supplementary cementitious materials. This potential contribution represents only a fraction of the required carbon reductions for achieving the goal of carbon neutrality in the coming decades. This paper describes the current situation of the cement industry in Latin America and the Caribbean and the global opportunities and strategies to reduce the carbon footprint of cement and concrete and their adaptation to the regional conditions. Besides describing emerging supplementary cementitious materials, the potential contributions of industrialization and quality control are discussed. Moreover, limitations related to geography and standardization are analyzed. Regional considerations are made given the specific prospects of human development.

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Section: Fillersmentioning

confidence: 93%

Overview of cement and concrete production in Latin America and the Caribbean with a focus on the goals of reaching carbon neutrality

Zaccardi

Pareja²,

Rojas³

et al. 2022

RILEM Tech Lett

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“…After 90 days of curing at 40 and 60 °C, Xu et al discovered that mortars containing dolomite powder had a higher compressive strength than mortars containing limestone powder. Accordingly, hydrotalcite and calcite formation aided in the refinement of pore structure [ 19 ]. However, there are relatively few studies on the durability of dolomite-powder concrete.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder

Luo

Yao

2022

Materials

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The effects of dolomite powder on the freeze–thaw resistance of C30 and C45 concrete were investigated in this manuscript. Scanning electron microscopy (SEM), the electric flux method, and a freeze–thaw cycle testing machine were used to determine the morphology, chloride penetration resistance, mass loss rate, and relative dynamic elastic modulus (Er) of concrete incorporating dolomite powder. Concrete’s freeze–thaw resistance improved as the dosage of dolomite powder was increased. After 300 cycles, the mass loss rates of reference specimens of C30 and C45 concrete were 6.71% and 0.14%, respectively, whereas the mass loss rates of C30 and C45 concrete in the presence of dolomite powder at a 50% replacement level were 5.81% and 0.13%, respectively. After 225 cycles, the Er of C30 concrete was 42.57% and 48.56% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Meanwhile, after 300 cycles, the Er of C45 concrete was 67.54% and 71.50% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Accordingly, the structure of dolomite-containing cement-based materials became more compact. Based on the Weibull distribution, a damage model for concrete containing dolomite powder was proposed. It established that concrete treated with dolomite powder had a lower degree of damage than reference specimens when subjected to the same freeze–thaw conditions.

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“…In addition to having good porosity, the use of mineral-based dolomite is also cheaper because it is naturally available in abundance. Dolomite is one of the most widely distributed and abundant minerals found in Aceh Province, Indonesia [1][2][3][4][5][6]. This study was design to get and modify inorganic oxide catalyst obtained from Aceh local dolomite applied for biodiesel production.…”

Section: Introductionmentioning

confidence: 99%

Aceh Local Dolomite Modified by Alkali Metals as a Low-Cost Solid Inorganic Catalyst for Biodiesel Synthesis

Ramli

Maisarah

Saidi

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Solid inorganic-based catalyst which mainly contains calcium oxide and magnesium oxide has been successfully prepared from local Aceh dolomite minerals. The calcination process of dolomite particles (150 μm) in the air environment for 4 hours changed those calcium and magnesium carbonates compounds into their oxide form, which are subsequently referred to as inorganic oxides. Furthermore, the calcined local dolomite has been chemically modified using alkaline metal precursors (lithium, sodium and cesium precursors). Physicochemical investigation on the modified dolomite indicated that introduction of lithium metal on modified dolomite surface has a positive impact on increasing the number and strength of basic sites on the catalyst. The modified catalyst had proved its catalytic activity for biodiesel synthesis with the yield values of 82;78;51 respectively.

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Reaction mechanism of dolomite powder in Portland-dolomite cement

Cited by 29 publications

References 55 publications

Overview of cement and concrete production in Latin America and the Caribbean with a focus on the goals of reaching carbon neutrality

Overview of cement and concrete production in Latin America and the Caribbean with a focus on the goals of reaching carbon neutrality

An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder

Aceh Local Dolomite Modified by Alkali Metals as a Low-Cost Solid Inorganic Catalyst for Biodiesel Synthesis

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