Using the Department of Environmental (DOE) method, design a concrete mix that will be used in this project based on the specification in Table 1. The relevant details and calculations are to be entered on the standard mix design form. Table 1 Item Details 30 N/mm² at 28 days 10% defectives (k=1.28) Standard deviation 8 N/mm² Characteristic strength Slump (mm) 30 – 60 Maximum free water cement ratio 0.5 290 kg/m³ Uncrushed; relative density 2.5 Minimum cement content |Coarse aggregate (gravel) Maximum size 20 mm Sand Uncrushed; specific gravity 2.6 90% passing 600 µm Absorption capacity 1.6% Moisture content 3.5%

Using the Department of Environmental (DOE) method, design a concrete mix that will be used in this project based on the specification in Table 1. The relevant details and calculations are to be entered on the standard mix design form. Table 1 Item Details 30 N/mm² at 28 days 10% defectives (k=1.28) Standard deviation 8 N/mm² Characteristic strength Slump (mm) 30 – 60 Maximum free water cement ratio 0.5 290 kg/m³ Uncrushed; relative density 2.5 Minimum cement content |Coarse aggregate (gravel) Maximum size 20 mm Sand Uncrushed; specific gravity 2.6 90% passing 600 µm Absorption capacity 1.6% Moisture content 3.5%

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. All the necessary tables forthis can be found in the Appendix. The concrete mix specifications are:o Characteristic compressive strength of 35 N/mm 2 at 28 days.o Failure rate of 2%o Previous control data yielded a standard deviation of 10 N/mm 2o CEM-I 42.5o Air-entraining is not requiredo Maximum water to cement ratio 0.40o Minimum cement content 390 kg/m 3o Required slump 50 mmo Coarse aggregate: Crushed maximum size 20mmo Fine aggregate: Uncrushed with 90% passing 600 μm sieveo Relative density of aggregates: 2.5o Coarse aggregate has 4% moistureo Fine aggregate is dry and has 1.2% absorption.o Volume of the required trial mix: 0.090 m 3Following the BRE step-by-step process estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities
A project specifies a concrete strength of 24.1 MPa. Materials engineers will design the mix for a strength higher than that to account for variables.a. Calculate the required average compressive strength of the mix design if the mixing plant has a standard deviation of s = 3.8 MPa.b. Using the ACI code equation, estimate what would be the modulus of elasticity of this concrete at the required compressive strength.
Q1 What moisture condition should the coarse and fine aggregate be in when mixing the concrete? A Unknown B Saturated C Oven Dry D Air Dried E SSD Q2 What restriction is placed on the size of a sample of a concrete batch? A 30 L B 15 L C 20 L D 10 L E 5 L
3) The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in dry condition, and 157 kg/m3 of free water required. The gravel available at job site has a moisture content of 0.8 % and absorption of 1.5 %, and the available sand has a moisture content of 1.1 % and absorption of 1.3 %. Determine: - the masses of gravel, sand and water per cubic meter that should be used at job site and the theoretical unit weight of the mix. - Assume that the same volume of dry coarse aggregate was replaced by dry lightweight aggregate of low bulk specific gravity (0.6 g/cm3) and M=5%, A=5%. What would be the new theoretical unit weight ?
3. A concrete mix includes the following ingredients per cubic foot: (14 pts.) = 25 lbs. = 11 lbs. Cement Water No Admixture Table shows possible changes that can be made to the mix ingredients. 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. What WIlII Happen? Ultimate Compressive Strength Cement (Ib) Water (Ib) Admixture Workablity None 25 28 15 11 None Water reducer Water reducer Superplasticizer Air entrainer Accelerator 25 11 25 8. 25 11 25 11 25 11
Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. The concrete mixspecifications are:o Characteristic compressive strength of 50 N/mm 2 at 7 days.o Failure rate of 1%o Previous control data yielded a standard deviation of 5 N/mm 2o CEM-I 52.5o Air-entraining is not requiredo Required slump 50 mmo Maximum cement content is 550 kg/m 3o Coarse aggregate: Uncrushed maximum size 10mmo Fine aggregate: Uncrushed with 45% passing 600 μm sieveo Relative density of aggregates: 2.7o Assume both types of aggregate as SSD. Proceed with the concrete mix design methodology and comment on any implications during thisprocess.
Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. The concrete mixspecifications are:o Characteristic compressive strength of 50 N/mm 2 at 7 days.o Failure rate of 1%o Previous control data yielded a standard deviation of 5 N/mm 2o CEM-I 52.5o Air-entraining is not requiredo Required slump 50 mmo Maximum cement content is 550 kg/m 3o Coarse aggregate: Uncrushed maximum size 10mmo Fine aggregate: Uncrushed with 45% passing 600 μm sieveo Relative density of aggregates: 2.7o Assume both types of aggregate as SSD.Proceed with the concrete mix design methodology and comment on any implications during thisprocess.
Assumng class A concrete mix, compute for the following: a. Total number of 40kg cement bags b. Quantity of sand in cu. m c. Quantity of gravel in cu. m.
The design of a concrete mix requires 1173 kg/m3of gravel in dry condition,582 kg/m3of sand in dry condition, and 157 kg/m3of free water. The gravelavailable at the job site has a moisture content of 0.8% and absorption of1.5%, and the available sand has a moisture content of 1.1% and absorptionof 1.3%. What are the masses of gravel, sand, and water per cubic meter thatshould be used at the job site?
(4) Given the information below: • The mixing water content for the required concrete mix is 180 kg/m3; • A water to cement ratio used is 0.5; • Coarse aggregate has a dry-rodded bulk density of 1800 kg/m³, the dry bulk volume of rodded coarse aggregate per unit volume of concrete is 0.69, and the absorption of 0.5%. According to the ACI (American Concrete Institute) procedure for the concrete mix design, determine: (a) How much of cement (kg) is used for a cubic metre of this concrete? (b) How much of dry coarse aggregate (kg) is used for a cubic metre of this concrete? (c) How much of coarse aggregate (kg) on the basis of SSD (saturated surface dry) condition?
Question 31 According to ASTM C33 Standard Specification for concrete Aggregates, what is the nominal maximum size aggregate? % Retained by Sieve Size mass # 4 95-100 # 3/8 70-90 # 3/4 30-65 1.5" 0-5 2" O Sieve 1.5" O Sieve 3/8" Sieve 2" O Sieve #4
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 psi