Homework Answers
Several freeze and thaw actions means extreme exposure to freezing and thawing action and also concrete is designed as air entrained concrete.
Therefore, as per ACI 211,
For maximum aggregate size of 12.5 mm subjected to extreme exposure condition,
Air content = 7%
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3) A fresh concrete with maximum aggregate size of 12.5 mm is subjected to severe freeze-...
The following requirements are specified for concrete construction of a reinforced concrete jetty exposed to sea...
The following requirements are specified for concrete construction of a reinforced concrete jetty exposed to sea water and moderate freeze and thaw environment Required Design Strength, fc Slump required Standard deviation Cement 35 MPa 25-75 mnm 4.8 MPa Ordinary portland cement with relative density 3.15 Fine Aggregate (Natural Sand) Oven-dry relative densitv SSD moisture content Moisture content of sample Fineness Modulus 2.3 0.2 % 4.3 % 2.63 Coarse aggregate (crushed stone) Nominal maximum aggregate size Oven-dry relative density SSD moisture...
Briefly State the influence of maximum aggregate size (i.e 19 mm vs. 38 mm) on the...
Briefly State the influence of maximum aggregate size (i.e 19 mm vs. 38 mm) on the mixing water content and the cement content of a concrete mix with a given water-cement ratio of 0.5
please help with this concrete design mix problem (40 points) Design the concrete mix according to...
please help with this concrete design mix problem
(40 points) Design the concrete mix according to the following conditions. Perform the necessary computations to determine all ingredients in (kg) per unit volume of mix, and state resources and cite references used for each step. Summarize your design in the table at the bottom, and answer the questions beneath the table. Application Environment Area 52, airport location Idaho, (150m x 50m) runway test section Exposures: freeze-thaw, deicers Design Environment Concrete Requirements:...
Admixture for Concrete
Please carry out a concrete mix design for an air-entrained concrete production based on the following data below;Characteristic strength: 69 N/mm2 28-day design strength concreteDefective rate (k): 5%PC strength class: 42,5Aggregate type: Coarse: CrushedFine : UncrushedSlump : S3 workability class under EN 206 (find out the range)Maximum aggregate size : 28 mm (2-digit)Maximum free w/c ratio: 0.48Minimum cement content: 385 kg/m3Relative density of aggregate : 2.69 (2 decimal places)Grading of fine aggregate passing 600 µm : 70%Standard deviation: 4 N/mm2Air content: 4%
Question 1. A concrete mix is to be designed for use in a 250 mm thick road pavement. The desired properties are pr...
Question 1. A concrete mix is to be designed for use in a 250 mm thick road pavement. The desired properties are provided below. Use the ACI method to calculate the required amounts per unit volume (/1m) of water, cement, course aggregate and fine aggregate. Slump 25 mm Average 28-day flexural strength of at least 4.5 MPa Coarse aggregate: nominal maximum size = 37.5 mm, dry-rodded weight 1600 kg/m3, specific gravity 2.68, moisture content 1.0 percent, absorption 0.5 percent Fine...
The gradations of the two different aggregates (Aggregates A and B) are shown below: 4.75 9.5 75 Size (mm) 19 12.5 2.36 50 20 0.6 40 12 0.3 28 8 0.15 0.075 Aggregate A100 Aggregate B 100 92 % finer 3...
The gradations of the two different aggregates (Aggregates A and B) are shown below: 4.75 9.5 75 Size (mm) 19 12.5 2.36 50 20 0.6 40 12 0.3 28 8 0.15 0.075 Aggregate A100 Aggregate B 100 92 % finer 35 2 If the two aggregates are mixed by a weight ratio of 3:1 (Aggregate A:B-3:1), what is the resulted passing percentage for the size 4.75 mm for the mixed aggregate? OB, 67% OC. 52% OD. A. 5896 43%
The...
Please show which equations you use and describe in detail. 21. concrete mix design, Design the...
Please show which equations
you use and describe in detail.
21. concrete mix design, Design the concrete mix according to the following conditions: Design Environment Unreinforced slab, Bozeman, Montana (cold climate) Required design strength = 3500 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%/100 lb cement Coarse aggregate: 2...
Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (cold...
Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (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 lb cement. Coarse aggregate: 2 in. nominal maximum size, crushed stone Bulk oven-dry specific gravity = 2.573, absorption...
What would be the maximum aggregate size used for the given mixture properties by using ACI...
What would be the maximum aggregate size used for the given mixture properties by using ACI Method of Mix Design. 28-day specified concrete strength is 3b Mpa, standard deviation is choosen as 3.a Mpa and it is required that no more than 1 test result in 200 will fall below the specified strength. Project Title: Detoration of wood column of a commercial building Project summary: Wood deterioration at the lower level of a heavy timber column, which supports five floor...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
The following requirements are specified for concrete construction of a reinforced concrete jetty exposed to sea water and moderate freeze and thaw environment Required Design Strength, fc Slump required Standard deviation Cement 35 MPa 25-75 mnm 4.8 MPa Ordinary portland cement with relative density 3.15 Fine Aggregate (Natural Sand) Oven-dry relative densitv SSD moisture content Moisture content of sample Fineness Modulus 2.3 0.2 % 4.3 % 2.63 Coarse aggregate (crushed stone) Nominal maximum aggregate size Oven-dry relative density SSD moisture...
please help with this concrete design mix problem
(40 points) Design the concrete mix according to the following conditions. Perform the necessary computations to determine all ingredients in (kg) per unit volume of mix, and state resources and cite references used for each step. Summarize your design in the table at the bottom, and answer the questions beneath the table. Application Environment Area 52, airport location Idaho, (150m x 50m) runway test section Exposures: freeze-thaw, deicers Design Environment Concrete Requirements:...
Question 1. A concrete mix is to be designed for use in a 250 mm thick road pavement. The desired properties are provided below. Use the ACI method to calculate the required amounts per unit volume (/1m) of water, cement, course aggregate and fine aggregate. Slump 25 mm Average 28-day flexural strength of at least 4.5 MPa Coarse aggregate: nominal maximum size = 37.5 mm, dry-rodded weight 1600 kg/m3, specific gravity 2.68, moisture content 1.0 percent, absorption 0.5 percent Fine...
The gradations of the two different aggregates (Aggregates A and B) are shown below: 4.75 9.5 75 Size (mm) 19 12.5 2.36 50 20 0.6 40 12 0.3 28 8 0.15 0.075 Aggregate A100 Aggregate B 100 92 % finer 35 2 If the two aggregates are mixed by a weight ratio of 3:1 (Aggregate A:B-3:1), what is the resulted passing percentage for the size 4.75 mm for the mixed aggregate? OB, 67% OC. 52% OD. A. 5896 43%
The...
Please show which equations
you use and describe in detail.
21. concrete mix design, Design the concrete mix according to the following conditions: Design Environment Unreinforced slab, Bozeman, Montana (cold climate) Required design strength = 3500 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%/100 lb cement Coarse aggregate: 2...
Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (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 lb cement. Coarse aggregate: 2 in. nominal maximum size, crushed stone Bulk oven-dry specific gravity = 2.573, absorption...
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