B.Tech Civil Concrete Mix Design — practice questions
25 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice B.Tech Civil Concrete Mix Design in the app →Per §10.1, concrete 'mix design' is best defined as the process of:Per §10.2, the two most important EMPIRICAL relations on which medium-strength mix design rests are:Per §10.3, the maximum nominal size of coarse aggregate shall not exceed which of the following limits?Per §10.3, the maximum nominal aggregate size RECOMMENDED for high-strength concrete is:Per §10.4, the standard deviation σ in concrete cube testing uses (n - 1) in the denominator under what name?Per §10.4 and IS 456-78, the minimum sample size to determine the standard deviation σ for concrete is:Per §10.5, the CHARACTERISTIC compressive strength of concrete is defined as the strength below which:Per §10.5, the Himsworth constant K (multiplier of σ) used to obtain target mean strength under the Indian StaPer §10.5, the area under the normal distribution curve between (μ - σ) and (μ + σ) is approximately:Per §10.4, the maximum coefficient of variation V (= σ/μ × 100) accepted by Indian Standard for concrete is:Per §10.6, methods listed in the source for blending different aggregates to match a standard grading curve inPer §10.7, the Indian Standard method of concrete mix design is described in:Per §10.8 (IS Method, Step 1), the target mean strength for mix design is computed as:Per Table 10.3, the suggested standard deviation σ for M 20 grade concrete with 'GOOD' degree of control is:Per §10.8 (Step 3, Table 10.6), the approximate ENTRAPPED air content for concrete made with 20 mm maximum sizPer §10.8 (Step 4, Table 10.7) at w/c = 0.60 and compacting factor 0.80, the reference WATER CONTENT for 20 mmPer §10.8 (Step 5, Table 10.9), the correction to sand percentage when the available fine aggregate is in ZonePer §10.8 (Step 5, Table 10.9), if the actual compacting factor is 0.1 HIGHER than the reference value of 0.80Per §10.8 (Step 5, Table 10.9), the correction for using ROUNDED aggregate (instead of the standard angular rePer Table 10.5 (durability in mix design), the MINIMUM cement content for REINFORCED concrete in 'severe' expoPer §10.8 (Step 9, Trial Mix), the calculated mix proportions are verified by casting at least how many cube sPer the worked illustrative example in §10.9 (M 20, 20 mm angular, 0.90 CF, good control, mild exposure), the Per §10.10 (High Strength Concrete Mix), the use of a SUPERPLASTICIZER allows the water content to be reduced Per §10.10 (High Strength Concrete Mix), the addition of Condensed Silica Fume (CSF) at about 10-15 percent byPer §10.8 (Step 8), the correction applied to mix proportions when site aggregates are found to be ABSORBING (