and is the major cause of the breaking up of cohesion in a mass of concrete. *
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A: This question is from building materials.
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A: Figure is as shown
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A: To discuss: Why the value of compressive strength more than tensile strength.
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Q: NE THE FORCE (Ib) E DATA BELOW:
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A: ANSWERS 1. False because slump test is done to find the workability of the concrete.
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- Q. Which of the following factors contributes the most to shear strength of concrete (Vc) with an existing inclined crack: a) Concrete shear resistance of un-cracked zone b) Aggregate interlock c) Dowel action d) Modulus of elasticityWhich type of aggregate is more harmful for using in concrete? Angular Rounded Rough ElongatedWhich one of the following sentences is not correct? a.For many years, tensile strength has been measured in terms of the compressive strength. b.The modulus of rupture where the normal-weight concrete has an fc of 4000 psi is 474 psi. c.For lightweight concretes tensile strength depends largely on the porous aggregate. d.For normal weight concrete, the tensile strength depends primarily on the strength of bond between hardened cement paste and aggregate.
- 19 - Which of the following does not affect the aggregate gradation in concrete?A) Special concrete productionB) StrengthC) Void ratioD) ShrinkageE) HydrationProblem 3 If the moisture content of coarse aggregate is lower than the absorption, the water needs to be added to the concrete from the estimated water content. a)False b)True c)Not enough informationDesign the concrete mix according to the following conditions:Design EnvironmentPavement slab, subjected to freezingRequired design strength = 21 MPaSlab thickness = 300 mmStatistical data indicate a standard deviation of compressive strength of1.7 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 9.5 mL/1% air/100 kgcement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 1922 kg/m3Moisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68
- Design the concrete mix according to the following conditions: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebar = 40 mm Minimum cover over rebar = 40 mm Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). Only air entrainer is allowed. Available Materials Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement. Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% Oven-dry rodded density = 1761 kg/m3 Moisture content = 2% Fineness modulus = 2.47what is tensile spilit test of geo polymer concreteWhat is your recommendation for the maximum size of coarse aggregate forthe following situation? A continuously reinforced concrete pavement crosssection contains a layer of 19-mm reinforcing bars at 150 mm. centers, suchthat the steel is just above mid-depth of a 250 mm. thick slab. Cover over thetop of the steel is therefore about 100 mm.
- A concrete mix includes the following ingredients per cubic meter: a. Cement = 400 kg b. Water = 176 kg c. No admixture Table P6.30 shows possible changes that can be made to the mix ingredi- ents. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same.The increased surface area of manufactured aggregates (e.g. crushed stone) contributes to a more fluid and flowable concrete in its fresh state. True FalseWill guve upvote if can answer Design the concrete mix according to the following conditions. Design Environment Pavement slab, (cold climate) Required design strength = 3000 psi Slab thickness = 12 in. Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples). Only air entrainer is allowed. Available Materials: Air entrainer: Manufacture specification is 0.15 fl oz/1% air/100 Ib cement. Coarse aggregate: 2 in. nominal maximum size, crushed stone Bulk oven-dry specific gravity = 2.573 Absorption = 0.1% Oven-dry rodded density = 120 pcf Moisture content = 1% Fine aggregate: Natural sand Bulk oven-dry specific gravity = 2.54 Absorption = 0.2% Moisture Content = 3.67% Fineness modulus = 2.68 Required Compressive Strength Water-Cement Ratio Coarse Aggregate Requirement Check Aggregate Size Air Content (Use Maximum) Slump (Use Maximum) Water Content Cement Requirement Admixture Fine Aggregate Requirement Final Batch Quantities…