What is the primary reason for using Silica fume in concrete? a. To increase the strength of concrete b. To improve the workability of concrete c. To improve the durability of concrete
Question
What is the primary reason for using Silica fume in concrete? a. To increase the strength of concrete b. To improve the workability of concrete c. To improve the durability of concrete
Solution
The primary reason for using Silica fume in concrete is to increase the strength of the concrete. Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys, and when added to concrete, it acts as a filler, filling the spaces between the aggregate and the cement paste, resulting in a denser product. This denseness leads to increased strength.
However, it's worth noting that while increasing strength is the primary reason, Silica fume also improves the durability and workability of concrete. It makes the concrete more resistant to chemical attack and reduces the permeability of the concrete, which can increase its lifespan. It can also improve workability by making the mix more cohesive, reducing the risk of segregation and making it easier to place and compact.
Similar Questions
Recycled concrete aggregate (RCA) produced from concrete waste has recently been a good alternative to natural aggregate because of the increased focus on sustainable development and environmental benefits. However, concrete incorporating RCA has inferior properties when compared to natural aggregate concrete. The inferior properties of RCA concrete can be improved by incorporating supplementary cementitious materials (SCMs). Fly ash and silica fume are commonly used SCMs in the concrete industry which improve the mechanical properties and durability of concrete. Nevertheless, there is an imminent deficiency of material in certain parts of the world, and finding a replacement is a challenge for the future of the concrete industry. Rice husk ash (RHA) is a waste material that can be used as a partial replacement to improve the inferior property of RCA concrete. In this study, mechanical properties such as compressive strength and splitting tensile strength are studied. Durability properties such as water absorption, chloride diffusion and acid attack were also investigated. Furthermore, fibrous and non-fibrous concrete were made to study the effect of RHA and RCA. The results revealed that RHA can be used to mitigate the poor performance of RCA concrete and improve the bond between concrete and fibers.
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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.
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.
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