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- Question 1: 10M Stirrups 350mm 2 - 20M 2-25M+1-20M 850mm F The figure above shows the cross section of a grade beam. fc-30MPa, fy=400MPa. Max aggregate size is 20mm. Minimum spacing between bars is 35mm. Concrete cover = 40mm Determine... a) Beam effective depth (d) b) Calculate reinforcing ratio (p) c) The depth of the equivalent rectangular stress block (a), and location of neutral axis (c). d) Check the failure mode of the beam using strain diagram e) Calculate Mr (Moment of resistance) in kN.m f) Calculate balanced reinforcing ratio (Pb). Confirm your finding in item "d" by comparing current reinforcement ratio to balanced reinforcement ratio.Design a concrete mix for the following conditions and constraints using the Absolute Volume Method. The material description are as follows: I. Design Environment Retaining Wall exposed to moderate sulfate exposure ii. Required Design Compressive Strength = 27.6 MPa ii. Standard Deviation of Compressive Strength of 1.8 MPa is expected (25 sample only) iv. Minimum dimension 200 mm v. Minimum space between re-bars 50 mm = 50 mm vi. vii. Maximum Slump is required viii. Only air entrained is allowed Minimum cover over re-bars II. i. Air Entrained - Manufacture Specification 5.5ml/1% air/100 kg cement (use maximum or +2% air Available Materials content) ii. Coarse Aggregates 25 mm Nominal Maximum Aggregate Size Rounded River Gravel (Note: apply water content reduction) Bulk Oven-dry specific gravity = 2.65 Absorption 0.2% Moisture Content 1.4% Oven-dry Rodded Density Fine Aggregates Natural Sand 1565 kg/m3 iii. Bulk Oven-dry specific gravity = Absorption = 0.7% 1.6% 2.60 Moisture Content…0 ww C. 6.31 A concrete mix includes the following ingredients per cubic foot: a. Cement = 25 lb b. Water = 11 lb c. No admixture Table P6.31 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. TABLE P6.31 to dignope Cement (lb) 25 28 25 25 25 25 25 amigur Water (lb) 15 11 11 8 11 11 11 Admixture None None Water reducer Water reducer Superplasticizer Air entrainer Accelerator What Will Happen? www.10345 Ultimate Compressive we Strength Workability
- a 250mmx500 concrete be am is to be reinforced with 5-28mm diameter bars at tension sde. For the web-reinforcement,10mm dimater bar was used (Cc=40mm). Using 19mm diameter aggregates for the concrete mix. 1.Determine the minimum clear spacing of main bars (horizontal layer) as prescribed by the code. a. 25mm b.28mm c.19mm d.32mm 2 .Determine the minimum clear spacing of main bars (Vertical layer) as prescribed by the code. a. 25mm b.28mm c.19mm d.32mm 3. What is the effective depth of the beam a.430 b. 426 c.415 d.405 Answers. 28,25,415Design a concrete mix for the following conditions and constraints using the Absolute Volume Method. The material description are as follows: I. Design Environment i. Retaining Wall exposed to moderate sulfate exposure ii. Required Design Compressive Strength = 27.6 MPa iii. Standard Deviation of Compressive Strength of 1.8 MPa is expected (25 sample only) iv. Minimum dimension = 200 mm v. Minimum space between re-bars = 50 mm vi. Minimum cover over re-bars = 50 mm vii. Maximum Slump is required viii. Only air entrained is allowed II. Available Materials i. Air Entrained – Manufacture Specification 5.5ml/1% air/100 kg cement (use maximum or +2% air content) ii. Coarse Aggregates 25 mm Nominal Maximum Aggregate Size Rounded River Gravel (Note: apply water content reduction) Bulk Oven-dry specific gravity = 2.65 Absorption = 0.2%…Design a concrete mix which is already solved by using Eprical Formulas according to ACI and TS and compate the results.
- The design engineer specifies a concrete strength of 3700 psi. A plant where s = 300 psi for 41 test results. Which is the required average compressive strength to be used in your mix design? a. 3900 psi; b) 4000 psi; c)4 100 psi; d) 4200 psiSolve the two problems (Use volume method and refer to concrete class mixture table)(ASAP PLEASE) Design a concrete mix for the following conditions and constraints using the Absolute Volume Method. The material description are as follows: I. Design Environment i. Retaining Wall exposed to moderate sulfate exposure ii. Required Design Compressive Strength = 27.6 MPa iii. Standard Deviation of Compressive Strength of 1.8 MPa is expected (25 sample only) iv. Minimum dimension = 200 mm v. Minimum space between re-bars = 50 mm vi. Minimum cover over re-bars = 50 mm vii. Maximum Slump is required viii. Only air entrained is allowed II. Available Materials i. Air Entrained – Manufacture Specification 5.5ml/1% air/100 kg cement (use maximum or +2% air content) ii. Coarse Aggregates 25 mm Nominal Maximum Aggregate Size Rounded River Gravel (Note: apply water…
- Create a design mix using the ACI DESIGN MIX PROCEDURE with the following parameters: Non-air Entrained Concrete Required Strength = 35 MPa Required Slump = 6 inches Maximum Size of CA = 3/4 inches Fineness Modulus of CA = 2.45 Density of CA = 1555 Kg/m3 SG of Water = 1.00 SG of Cement = 3.15 SG of CA = 2.84 SG of FA = 2.40a. A split-tension test was conducted on a concrete cylinder with a 150 mm diameter and 300 mm length. Theload that split the cylinder is 268.5 KN. Calculate the splitting tensile strength (fct) of the concrete. b.The third-point flexural strength test was conducted on a flexural beam of 150 mm by 150 mm cross sectionand 450mm span. The maximum load at failure was 29.2 KN. Calculate the flexural strength of the conc c. The ultimate tensile strength of geogrid is 270 KN/m, and the combined reduction factor for reinforcementapplication is 3.0. Determine the allowable tensile strength. d.A compacted sample of Asphalt cement contains 5.3% asphalt binder by weight of total mix, and its bulkspecific gravity is 2.428. The theoretical maximum specific gravity of the mix is 2.592, and the bulk specificgravity of the aggregate is 2.703. Determine the VMA, VTM and VFA of the Asphalt CeQ # 4. Temperature of Mass Concrete can be controlled by using various techniques. Please suggest numerous ways to control the temperature of mass concrete by using ‘Mix Design Technique