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Questions and Answers
What is the primary purpose of using supplementary cementitious materials in concrete?
What is the primary purpose of using supplementary cementitious materials in concrete?
- To increase the density of concrete
- To change the color of concrete
- To reduce the carbon footprint of concrete by reducing portland cement consumption (correct)
- To increase the strength of concrete
What type of materials react chemically with calcium hydroxide to form calcium silicate hydrates?
What type of materials react chemically with calcium hydroxide to form calcium silicate hydrates?
- Fly ash
- Pozzolans (correct)
- Ground granulated blast furnace slag
- Supplementary cementitious materials
What is the typical size range of fly ash particles?
What is the typical size range of fly ash particles?
- 5 to 500 µm
- 0.1 to 10 µm
- 0.5 to 100 µm (correct)
- 1 to 1000 µm
What is the fineness range of fly ash in m²/kg?
What is the fineness range of fly ash in m²/kg?
What is the byproduct of coal-fired thermal power plants used as a supplementary cementitious material?
What is the byproduct of coal-fired thermal power plants used as a supplementary cementitious material?
What is the chemical reaction between pozzolans and calcium hydroxide that contributes to the strength development in concrete?
What is the chemical reaction between pozzolans and calcium hydroxide that contributes to the strength development in concrete?
What is the primary reason why sand is usually well graded in a concrete mix?
What is the primary reason why sand is usually well graded in a concrete mix?
What is the primary reason for the higher rate of hydration in cement with higher fineness?
What is the primary reason for the higher rate of hydration in cement with higher fineness?
What is the effect of a larger maximum size of aggregate on the concrete mix?
What is the effect of a larger maximum size of aggregate on the concrete mix?
What is the typical specific surface area range of Rapid Hardening Portland Cement (ASTM Type III)?
What is the typical specific surface area range of Rapid Hardening Portland Cement (ASTM Type III)?
What is the primary purpose of Stage II in the hydration process of concrete?
What is the primary purpose of Stage II in the hydration process of concrete?
What is the primary reason why elongated and flaky aggregates are not desirable in concrete?
What is the primary reason why elongated and flaky aggregates are not desirable in concrete?
What is the primary cause of the initial set of cement paste?
What is the primary cause of the initial set of cement paste?
What is the main factor that determines the increase in temperature of concrete due to hydration?
What is the main factor that determines the increase in temperature of concrete due to hydration?
What is the primary difference between coarse aggregate and sand in terms of grading?
What is the primary difference between coarse aggregate and sand in terms of grading?
What is the relationship between the carbon content and the elongation of carbon steel?
What is the relationship between the carbon content and the elongation of carbon steel?
What is the primary purpose of the Vicat needle test (ASTM C191, 2008)?
What is the primary purpose of the Vicat needle test (ASTM C191, 2008)?
What is the characteristic of round aggregates that makes them beneficial in concrete?
What is the characteristic of round aggregates that makes them beneficial in concrete?
What is the characteristic of the hydration reaction during Stage III?
What is the characteristic of the hydration reaction during Stage III?
What is the purpose of controlling the grading of aggregates in a concrete mix?
What is the purpose of controlling the grading of aggregates in a concrete mix?
What is the primary advantage of using angular aggregates in concrete?
What is the primary advantage of using angular aggregates in concrete?
What is the primary consequence of high heat of hydration in massive concrete constructions?
What is the primary consequence of high heat of hydration in massive concrete constructions?
What happens to the electrical conductivity of the cement paste after the final set?
What happens to the electrical conductivity of the cement paste after the final set?
What is the classification of coarse aggregates with a density of 3000-5000 kg/m³?
What is the classification of coarse aggregates with a density of 3000-5000 kg/m³?
What is the characteristic of a cement with normal consistency?
What is the characteristic of a cement with normal consistency?
What is the stage during which the concrete densifies over time?
What is the stage during which the concrete densifies over time?
What is the primary reason for the decrease in hydration of cement during Stage IV?
What is the primary reason for the decrease in hydration of cement during Stage IV?
What is the effect of coarse surface texture on the workability of concrete?
What is the effect of coarse surface texture on the workability of concrete?
What is the primary reason why aggregates with a coarse surface texture bond well with the cement paste?
What is the primary reason why aggregates with a coarse surface texture bond well with the cement paste?
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