What is your recommendation for the maximum size of coarse aggregate for a column 500X500 mm if the minimum clear distance between reinforcement bars is 50 mm and the minimum cover is 40 mm.
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What is your recommendation for the maximum size of coarse aggregate for a column 500X500 mm if the minimum clear distance between reinforcement bars is 50 mm and the minimum cover is 40 mm.
12.5 mm
25 mm
37.5 mm
19 mm
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- a) Calculate the temperature of aggregates to produce fresh concrete having the sametemperature with the ambient temperature. Following data in Table 1 could be used:A hollow concrete masonry unit has an actual dimension of 150mm x 200mm x 400mm(W x H x L). The unit was tested in a compression machine with the following result.Failure load = 1,200 kNNet volume = 4,400,000 mm3Determine: a) the gross area compressive strength.b) the net area compressive strength.1. The poisons ratio of concrete is between ____ to 0.21. a) 0.08 b) 0.11 c) 0.12 d) 0.15 2. Grade 50 rebar is equivalent to ____ a) 280 MPa b) 420 MPa c) 690 MPa d) 350 MPa
- Design the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebar = 40 mmMinimum cover over rebar = 40 mmStatistical data indicate a standard deviation of compressive strength of2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir 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 = 3.6,Oven-dry rodded density = 1761 kg/m3Moisture content = 2.5,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.659, absorption = 0.5,Moisture content = 2,Fineness modulus = 2.472.1 Determine the shear strength of concrete Vc per equation (c) of table 22.5.5.1 in ACI318-19Give full explanation Awall form 14 ft high is filled with 160 lb per cu ft concrete at a tem perature of 70°F. The concrete is Type I without a retarder. Concrete will be placed with normal internal vibration to a depth of less than 4 ft. The rate of placement is 5 ft per hr. From Table 1, the value of Cw is 1.1 and from Table 2 the value of Cc is 1.0. The rate of placement is less than 7 ft per hr and the place ment height does not exceed 14 ft so calculate the lateral pressure by using appropriate formula.
- Design a concrete mix for the following conditions and constraints using the absolute volume method:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebars = 40 mmMinimum cover over rebars = 40 mmStatistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples)Only air entrainer is allowedAvailable MaterialsAir EntrainerManufacturer specification 6.3 ml/1% air / 100 kg cementCoarse aggregate19 mm nominal maximum size, river gravel (rounded)Bulk oven dry specific gravity = 2.55, Absorption = 0.3%Oven dry-rodded density = 1761 kg/m3Moisture content = 2.5%Fine aggregateNatural sandBulk oven-dry specific gravity = 2.659, Absorption = 0.5%Moisture content = 2%Fineness modulus = 2.47How do all stabilizing techniques increase the strength of aggregate??A hollow concrete masonry unit has actual gross dimensions of 190 mm X190 mm X 390 mm (width X height X length). The unit is tested in a compression machine with the following results:Failure Load = 1110 kNNet volume of 6 X 106 mm3a. Calculate the gross area compressive strength.b. Calculate the net area compressive strength.
- what is the aci design mix or proportioning of standard compressive ddesign strength values (without ad mixture or other supplementaries) of cement, water, ad aggregates and fine aggregates ratio for 3000 psi, 4000 psi and 5000 psi. please help me and if you searched for it pls inlcude the links here i want to read itEstimate the modulus of elasticity and the shear modulus of a concrete specimen with a dry density of 150 pcf (2400 kg/m3) and compressive strength of 4500 psi (31MPa) using Poisson’s ratio, ? =0.18.2. According to Section 10.2.3 of AC, the maximum usable strain at extreme concrete compression fiber shall be assumed equal to a. 0.004 b. 0.005 c. 0.003 d. 0.002 e. 0.001 f. 0.008