General concrete knowledge: Select all of the statements below that accurately describe curing of cement. Marks are awarded for each correct selection, but are deducted for incorrect selections. Total marks awarded for this question will not be less than zero. a. Concrete doesn't start to achieve strength gain until it dries out, so should be kept dry. Curing methods are designed to keep out any excess moisture from the surrounding environment. b. Concrete has achieved its full strength as soon as it has set (hardened). c. Curing methods are designed to keep the concrete moist, allowing the hydration reactions to continue. d. Concrete reaches it's maximum strength at 28 days. e. Concrete continues to gain strength over its lifetime, but at a reducing rate. f. Different types of curing methods have no impact on the rate of strength gain for concrete. g. A higher ultimate strength can be obtained with a longer curing time. h. After 28 days, concrete has achieved most (but not all) of it's strength.
Question
General concrete knowledge: Select all of the statements below that accurately describe curing of cement. Marks are awarded for each correct selection, but are deducted for incorrect selections. Total marks awarded for this question will not be less than zero. a. Concrete doesn't start to achieve strength gain until it dries out, so should be kept dry. Curing methods are designed to keep out any excess moisture from the surrounding environment. b. Concrete has achieved its full strength as soon as it has set (hardened). c. Curing methods are designed to keep the concrete moist, allowing the hydration reactions to continue. d. Concrete reaches it's maximum strength at 28 days. e. Concrete continues to gain strength over its lifetime, but at a reducing rate. f. Different types of curing methods have no impact on the rate of strength gain for concrete. g. A higher ultimate strength can be obtained with a longer curing time. h. After 28 days, concrete has achieved most (but not all) of it's strength.
Solution
The correct statements that accurately describe the curing of cement are:
c. Curing methods are designed to keep the concrete moist, allowing the hydration reactions to continue. d. Concrete reaches its maximum strength at 28 days. e. Concrete continues to gain strength over its lifetime, but at a reducing rate. g. A higher ultimate strength can be obtained with a longer curing time. h. After 28 days, concrete has achieved most (but not all) of its strength.
The incorrect statements are:
a. Concrete doesn't start to achieve strength gain until it dries out, so should be kept dry. Curing methods are designed to keep out any excess moisture from the surrounding environment. This is incorrect because curing methods are designed to keep the concrete moist, not dry. b. Concrete has achieved its full strength as soon as it has set (hardened). This is incorrect because concrete continues to gain strength over time, it does not achieve its full strength as soon as it has hardened. f. Different types of curing methods have no impact on the rate of strength gain for concrete. This is incorrect because different curing methods can indeed impact the rate of strength gain for concrete.
Similar Questions
General concrete knowledge: HE stands for High Early Strength Cement. Select all of the correct statements regarding HE cement. Marks are awarded for each correct selection, but are deducted for incorrect selections. Total marks awarded for this question will not be less than zero. a. Strength achieved at 7 days by concrete using HE cement is lower than the strength achieved at 7 days when using GP cement. b. Concrete made with HE cement is suitable for use in situations where it is beneficial to strip formwork early. c. Concrete made with HE cement produces greater heat of hydration than GP cement. d. Concrete made with HE cement produces less heat of hydration than GP cement. e. Concrete made with HE cement is suitable for use in thick concrete elements. f. Concrete made with HE cement is suitable for use in situations where there are low ambient temperatures (eg: colder climates, early morning pours etc.) g. Strength achieved at 7 days by concrete using HE cement is higher than the strength achieved at 7 days when using GP cement.
The diagrams below show the stages and equipment used in the cement-making process, and how cement is used to produce concrete for building purposes.Summarize the information by selecting and reporting the main features and make comparisons where relevant.
Compressive Strength of Concrete
In a material that holds groundwater, porosity:controls the amount of water that can be storedis constant from one type of material to anotherdetermines the composition of the cement between grains and clastsdoes not depend on the size and shape of grains and clasts
Which of the following dental cements is used as a luting and base cement and is high in strength?
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