To increase the shearing stress significantly, high-energy ball milling can be applied [52, 92, 93, 116]. For instance, Ghosh et al. proposed that the graphene and cement grains were blended using a planetary ball mill via 30 g Zirconia balls, which is an efficient approach to obtain a homogenous distribution of graphene with cement grains.
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C fly ash was used as Raw Fly Ash and Grinding of Raw fly ash in the ball mills was carried out for 2 hours to obtain Energetically Modified Fly Ash (EFA). The Ordinary Portland cement (OPC) was
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Portland-Limestone Cement. NCC Spring 2013 . April 2, 2013. Tim Cost, PE, FACI (ground in a ball mill) had ASTM C1202 chloride ion
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7. TYPES OF PORTLAND CEMENT According to the ASTM standard, there are five basic types of Portland Cement:. 1) Regular cement, general use, called Ordinary Portland cement (OPC) – Type Ι 2) Moderate sulphate resistance, moderate heat of hydration, C3A < 7% , Modified cement
Portland cement type I (OPC) was partially replaced with RHA and GS and a blended of RHA and GS. The mortar mixtures were made with OPC containing 0–40 % of RHA and GS. RHA and GS with 3 % by weight retained on sieve No. 325 (opening 45 µm of sieve No. 325) were obtained using ball mill.
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The Effect of Various Reagents on the Heat Liberation Characteristics of Portland Cement, Journal of the American Concrete Institute, Vol. 37, 161-184, 1940. Lerch, W., The Influence of Gypsum on the Hydration and Properties of Portland Cement Pastes, Proceedings- American Society for Testing and Materials, Vol. 46, 1251-1297, 1946.
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C3S is one of the main minerals of Portland cement, the barium ion was doped to design 24.3 wt.% C3 The crushed clinker and the gypsum were ground to prepare cement by a planetary ball mill
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2.1.1 Cement In this study, a Type I/II (ASTM C 150) ordinary portland cement (OPC) with a specific gravity of 3.15 andan average particle size of 17 microns was used. The chemical composition of the portland cement and its selected physical properties are presented in Table 1.
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C3S is one of the main minerals of Portland cement, the barium ion was doped to design 24.3 wt.% C3 The crushed clinker and the gypsum were ground to prepare cement by a planetary ball mill
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An article of manufacture and method of manufacture of a cement product composition. A cementitious clinker consisting essentially of an alpha belite and a ferrite phase having a composition of about 0.04-0.13 moles Na 2 O, 0.03-0.07 moles K 2 O, 0.09-0.18 moles Fe 2 O 3 , and 2.8 moles dicalcium silicate.
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7. TYPES OF PORTLAND CEMENT According to the ASTM standard, there are five basic types of Portland Cement:. 1) Regular cement, general use, called Ordinary Portland cement (OPC) – Type Ι 2) Moderate sulphate resistance, moderate heat of hydration, C3A < 7% , Modified cement
Portland cement type I (OPC) was partially replaced with RHA and GS and a blended of RHA and GS. The mortar mixtures were made with OPC containing 0–40 % of RHA and GS. RHA and GS with 3 % by weight retained on sieve No. 325 (opening 45 µm of sieve No. 325) were obtained using ball mill.
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An article of manufacture and method of manufacture of a cement product composition. A cementitious clinker consisting essentially of an alpha belite and a ferrite phase having a composition of about 0.04-0.13 moles Na 2 O, 0.03-0.07 moles K 2 O, 0.09-0.18 moles Fe 2 O 3 , and 2.8 moles dicalcium silicate.
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Each clinker was ground in a laboratory ball mill, together with 5% of gypsum and 1.5% Of water. At the same time, SnS04 was added into the mill at the dosage of 15 g/t for each ppm of Cr(Vl) to be reduced. Table I shows the characteristics of each clinker. After 10 minutes from the end of the grinding, the
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Portland cement is prepared by grinding the clinkers in a ball mill with approximately 5 wt. % each of gypsum (CaSO 4.2H 2 O) and limestone. The mill temperature rises to about 130 °C during grinding, causing partial decomposition of the gypsum to form hemihydrate (CaSO 4.0.5H 2 O) and occasionally anhydrite (CaSO 4).
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To cease hydration, all cement pastes samples were soaked in isopropanol for 48 h. Samples were crushed in a ball mill and manually through 80 μm square-mesh sieve after being placed in a vacuum drying oven (−0.8 psi) for 48 h at 20 °C, 10 wt% corundum was added to the sample powder as standard reference.
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Katsiotia and coworkers evaluated six commercial grinding additives used in the production of Portland cement (ground in a ball mill at the laboratory stage). They tested all cement mixtures for initial and final setting times, consistency of standard paste, flow of traditional mortar, and compressive strengths after 2, 7, and 28 days.
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C3S is one of the main minerals of Portland cement, the barium ion was doped to design 24.3 wt.% C3 The crushed clinker and the gypsum were ground to prepare cement by a planetary ball mill
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Wrongly considered as an inert filler, limestone can influence cement hydration leading to the formation of Aft and Afm phases based on carbonate ion. A thermodynamic approach allowed to study the equilibrium between carbonate, sulfate and aluminate phases and to predict the effect of limestone addition on cement performances.
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Portland cement type I (OPC) was partially replaced with RHA and GS and a blended of RHA and GS. The mortar mixtures were made with OPC containing 0–40 % of RHA and GS. RHA and GS with 3 % by weight retained on sieve No. 325 (opening 45 µm of sieve No. 325) were obtained using ball mill.
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To cease hydration, all cement pastes samples were soaked in isopropanol for 48 h. Samples were crushed in a ball mill and manually through 80 μm square-mesh sieve after being placed in a vacuum drying oven (−0.8 psi) for 48 h at 20 °C, 10 wt% corundum was added to the sample powder as standard reference.
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Katsiotia and coworkers evaluated six commercial grinding additives used in the production of Portland cement (ground in a ball mill at the laboratory stage). They tested all cement mixtures for initial and final setting times, consistency of standard paste, flow of traditional mortar, and compressive strengths after 2, 7, and 28 days.
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a portland cement composition is described which is capable of setting in a short period of time. the cement composition contains an additive composed of an ethanolamine and an acetate, acetic acid or acetic anhydride in amounts by weight between about 0.1% and 0.4%.
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Portland cement is prepared by grinding the clinkers in a ball mill with approximately 5 wt. % each of gypsum (CaSO 4.2H 2 O) and limestone. The mill temperature rises to about 130 °C during grinding, causing partial decomposition of the gypsum to form hemihydrate (CaSO 4.0.5H 2 O) and occasionally anhydrite (CaSO 4).
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ACD from portland cement is a common occupat ional dermatitis among construction workers and a reduction in the chromate content of cement would be a reasonable preventive measure. 18,27 Reductions of hexavalent chromium in portland cement, required by law in Europe and Singapore, have produced reductions in the rates of allergic contact
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To increase the shearing stress significantly, high-energy ball milling can be applied [52, 92, 93, 116]. For instance, Ghosh et al. proposed that the graphene and cement grains were blended using a planetary ball mill via 30 g Zirconia balls, which is an efficient approach to obtain a homogenous distribution of graphene with cement grains.
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Katsiotia and coworkers evaluated six commercial grinding additives used in the production of Portland cement (ground in a ball mill at the laboratory stage). They tested all cement mixtures for initial and final setting times, consistency of standard paste, flow of traditional mortar, and compressive strengths after 2, 7, and 28 days.
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a portland cement composition is described which is capable of setting in a short period of time. the cement composition contains an additive composed of an ethanolamine and an acetate, acetic acid or acetic anhydride in amounts by weight between about 0.1% and 0.4%.
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The free mobile ions including potassium (K+), sodium (Na+), calcium (Ca2+), hydroxyl ions (OH −), sulfate (SO 4 2−), silicate ions, and aluminate ions, which are liberated during the early stage of hydration, are responsible for the conductivity of the interstitial solution of the cement matrix at this hydration age , , . Accordingly, the
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To increase the shearing stress significantly, high-energy ball milling can be applied [52, 92, 93, 116]. For instance, Ghosh et al. proposed that the graphene and cement grains were blended using a planetary ball mill via 30 g Zirconia balls, which is an efficient approach to obtain a homogenous distribution of graphene with cement grains.
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Portland-Limestone Cement. NCC Spring 2013 . April 2, 2013. Tim Cost, PE, FACI (ground in a ball mill) had ASTM C1202 chloride ion
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To cease hydration, all cement pastes samples were soaked in isopropanol for 48 h. Samples were crushed in a ball mill and manually through 80 μm square-mesh sieve after being placed in a vacuum drying oven (−0.8 psi) for 48 h at 20 °C, 10 wt% corundum was added to the sample powder as standard reference.
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