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Concrete Technology Questions
Cement hydration chemistry: which set of cement compounds react with water to drive the hydration reactions that produce strength and paste structure in ordinary Portland cement?
Concrete workability by compaction factor: given Wp and Wf are the weights of a cylinder filled with partially compacted and fully compacted concrete respectively, if the measured compaction factor is 0.95, how would you classify the concrete's workability?
In cement manufacturing for civil engineering works, which raw material is most commonly used as the principal source of calcium carbonate (the main ingredient in clinker)?
In concrete technology quality control, the slump test is specifically conducted to assess the workability/consistency of which material?
Fresh concrete rheology: internal friction among concrete ingredients is reduced most effectively by which adjustment to the mix?
Sieve analysis and fineness modulus: a 20 kg coarse aggregate sample is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 μm, 300 μm, and 150 μm sieves with masses retained 0, 2, 8, 6, 4 kg respectively (zero on the remaining sieves). What is the fineness modulus (FM) of the aggregate?
Clinker burning temperature: during the manufacture of ordinary Portland cement, the raw mix is burned in the kiln to form clinker at approximately what peak temperature?
Hand tool proportions in finishing works: the typical ratio of length to breadth of a wooden float used for plaster or concrete finishing is approximately which of the following?
Segregation risk in fresh concrete: the likelihood of segregation increases most in which of the following situations?
Aggregate shape effects: for a fixed water content, workability of concrete will decrease if the aggregates contain an excess of which particle types?
Nominal mix equivalence: the old designation M 150 concrete (≈ 15 MPa characteristic strength) corresponds approximately to which nominal mix proportion by volume?
Aggregate grading for quality concrete: to ensure durable, workable concrete with reduced voids and economy of paste, which type of aggregate should be preferred?
Concrete technology: proper proportioning of concrete ingredients ensures which of the following desirable properties in construction practice?
Concrete measurement practices: which of the following statements about weighing and measuring ingredients, and finished concrete volume, are correct?
Concrete admixtures: workability of concrete can be improved by adding which of the following types of agents or compounds?
Concrete composition: concrete is primarily composed of which of the following materials?
Concrete strength classification: what is the permissible compressive strength of M300 grade concrete expressed in kg/cm^2?
Concrete construction practices: construction joints are generally provided at which of the following positions or conditions?
Cement types: the high early strength of rapid hardening cement at initial stages is mainly due to which factor?
Concrete operations: the process of proper and accurate measurement of concrete ingredients to maintain uniform proportion is known as what?
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