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Overall, careful selection of raw materials, particle size control, additives, and firing temperature are all important factors in controlling hydration and producing high-quality dolomite refractory. 2- Raw materials used for manufacturing Portland cement and cement kiln. The raw materials used for manufacturing Portland cement typically ...
Abstract This study investigated the sulfate resistance of Portland-dolomite cement (PDC) cured at different temperatures. Mortars of Portland cement (PC) and PDC with different dosages of dolomite, 10, 20, 30% by weight, were cured in water at 20 °C and 60 °C for 28 days before immersed in 50 g/L Na2SO4 solution at 20 °C.
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Dolomite on Portland Cement Performance. Wenxiu Jiao 1,2, Aimin Sha 1,2, *, Zhuangzhuang Liu 1,2 and Shuo Li 2. 1 Key Laboratory for Special Area Highway Engineering of Ministry of Education ...
PORTLAND CEMENT IS NOT A BRAND, BUT A TYPE OF CEMENT USED ALMOST UNIVERSALLY TODAY IN NORTH AMERICA AND THROUGHOUT MUCH OF THE INDUSTRIALIZED WORLD. IT EMERGED IN THE EARLY 19TH CENTURY AS ONE OF THE MAJOR TECHNICAL DISCOVERIES OF THE INDUSTRIAL AGE. In 1824, an …
Portland Cement (PC) P II 52.5R produced by Jiangnan Xiaoyetian Cement Co. LTD, China and dolomite produced in Lingshou, Hebei were used in this study. The …
The first elaborated mix corresponds to economical normal strength concrete (water-cement ratio 0.73) and dolomite by-product replaces 60% of aggregate. The second mix corresponds to high-performance self-compacting concrete (water-cement ratio 0.56) and dolomite by-product replacing 40% of aggregate. Silica fume was used in this case …
Dolomite by-products are loose aggregate mix with bulk density 1500–1800 kg/m 3 and particle density 2640 kg/m 3. Grading analysis of dolomite by-product was done in accordance with standard EN 911-1, using the method of wet sieving due to the high content of dust particles.
mite and limestone affect Portland metakaolin cement in a similar way, with the reactivity being the major difference between the two carbonate sources. This indicates that with regard to the strength development up to 90 days dolomite can be used instead of limestone to replace parts of a Portland metakaolin cement. 2017 Elsevier Ltd.
The cement pastes investigated in this study were prepared by replacing 40 % wt of a Portland cement clinker by natural dolomite . Precipitated gypsum was added, when mixing, in order to achieve a sulphate content of 2.5 % wt per gram of binder. The cement clinker was ground in a
The materials used for this study were Portland cement clinker (C, from Norcem), and laboratory-grade dolomite (D, Magnesia 4179 from Brenntag), limestone …
Sources of calcium are generally widespread and quite extensive. These sources are limestone, dolomite, marl, chalk, and oyster shell. Cement plants account …
The reaction of dolomite is suppressed with increasing the amount of gypsum. In the system with insufficient gypsum, the formation of hemicarbonate takes place in dolomite …
Calcium sulfoaluminate cement Hydration Dolomite powder Limestone powder 1. Introduction Using supplementary cementitious materials (SCMs) to replace cement clinker is an economical and practical method to reduce CO2 emissions and promote use of sustainable cementitious materials.
The paper presents results of studying the patterns in which mineral additives obtained on the basis of local raw materials of the Republic of Mordovia (calcined polymineral clay, dolomite and thermally activated mixture of clay and limestone) influence the technological characteristics of plasticized cement paste, phase composition and ...
Kumar et al. [ 85] showed the impact of adding dolomite waste as a replacement of cement in concrete. The 0%, 5%, 10%, 15%, and 20% of cement were replaced in the various mixes. They found the maximum compressive strength (an increase of 5.84%) at a 5% replacement of cement by dolomite waste powder.
This study investigated the hydrate phase assemblage in Portland cement pastes containing dolomite or a combination of dolomite and metakaolin after leaching, …
The formation of hydrotalcite in Portland composite cements, especially at elevated temperatures (60 °C), has also been reported for other replacement levels of dolomite [ [13], [14], [15]]. Hydrotalcite has shown good resistance to leaching in MgO-activated slag binder systems [16,17].
Portland cement (P I 42.5), dolomite powder and fly ash were used in this manuscript, and their specific densities were 3.10, 2.88, 2.60 g/cm 3, respectively. The dolomite was natural rock supplied by Guizhou Province, China. Coarse aggregate used in this work was crushed basalt from Huzhou xinkaiyuan gravel Co., Ltd.
The hydration products and microstructure of PDC pastes were investigated by using XRD, TGA, MIP, and SEM, with Portland-limestone cement (PLC) as a comparison. Results show that dolomite...
Cement. CEM I/42.5N Ordinary Portland cement (OPC) according to (ASTM C150) [49] is used in this study. Methods. The chemical and mineralogical composition was performed using XRF (X-Ray Fluorescence - Axios, Sequential WD- XRF, PANalytical 2005), and XRD (X-Ray Diffraction - PANalytical with Cu anode). The. …
Mortars of Portland cement (PC) and PDC with different dosages of dolomite, 10%, 20%, 30% by weight, were cured in water at 20 °C and 60 °C for 28 days before immersed in 50 g/L Na2SO4 solution ...
This paper provides the effect of dolomite waste on various properties (fresh, mechanical, and durability) of concrete, analyzes the crucial findings of dolomite waste based on the partial replacement of cement and aggregate, and discusses its suitability as a construction material.
Abstract This study investigated the sulfate resistance of Portland-dolomite cement (PDC) cured at different temperatures. Mortars of Portland cement (PC) and PDC with …
Similarly, pebbles worth Nu 1.26bn was exported, followed by dolomite slabs with Nu 1.01bn, and gypsum worth Nu 921mn. The last two on the list of exported commodities includes ordinary Portland cement and Portland pozzolana cement worth Nu 743mn and Nu 557mn each consecutively.
Dolomite dissolution influenced the hydrate assemblage by the formation of additional hydrotalcite. At 60 °C, ettringite is not stable in ordinary Portland cement and limestone cement....
For clarifying the effect of dolomite on the volume stability of Portland dolomite cement (PDC) at high reaction degree, the length change of PDC pastes with the replacement levels of 10–30 wt ...
Portland cement (P I 42.5), dolomite powder and fly ash were used in this manuscript, and their specific densities were 3.10, 2.88, 2.60 g/cm3, respectively. The dolomite was natural rock supplied by Guizhou Province, China. Coarse aggregate used in this work was crushed basalt from Huzhou xinkaiyuan gravel Co., Ltd.
Section snippets Materials and cement paste preparation. For the preparation of the various binder compositions, we used a Portland cement (C) supplied by Norcem AS, to which only gypsum was added during grinding, natural dolomite (D, dolomite content: approx. 90 wt%, for more detailed information see Ref. [11]) supplied by …
It was found that 0.8 tons of CO2 is released into the atmosphere with the manufacture of 1 ton of cement. Dolomite powder is a natural form of calcium magnesium carbonate [CaMg (Co3)2]. ... Cement. In this experiment Ordinary Portland cement of 53 grade was used as per IS code. The cement having fineness as retained on 90 micron …
In 1966, approximately 125 million tons of raw materials, exclusive of fuel, air, water, and power were consumed to produce almost 74 million tons of portland cement in the United States that is about …
This study investigated the hydrate phase assemblage in Portland cement pastes containing dolomite or a combination of dolomite and metakaolin after leaching, …
tance of Portland-dolomite cement (PDC) cured at different temperatures. Mortars of Portland cement (PC) and PDC with different dosages of dolomite, 10, 20, 30% by …
The reaction process of dolomite in PDC is dependent on the availability of aluminate phases. In the presence of free alumina, dolomite would react preferentially to …
Dolomite is replaced in the percentage of 10 percentage and 15percentage with the weight of cement. Vermiculite is replaced in the percentage of 20 percentage and 30 percentage with the weight of fine aggregate. A design …