We require a mix with a mean 28-day compressive strength of 28 MPa. The slump is selected to be 40 mm. The maximum size of aggregate is 25 mm, its bulk density is 1570 kg/m3, and its specific gravity is 2.59. The available fine aggregate has a fineness modulus of 2.60 and a specific gravity of 2.62. No air entrainment is required. The cement relative density is 3.15. 1- Design the concrete mix according to ACI method satisfying the above requirements (find water, cement, fine and coarse aggregate masses (in kg/m³) and volumes (in m³) to form 1 m³ of concrete.).

We require a mix with a mean 28-day compressive strength of 28 MPa. The slump is selected to be 40 mm. The maximum size of aggregate is 25 mm, its bulk density is 1570 kg/m3, and its specific gravity is 2.59. The available fine aggregate has a fineness modulus of 2.60 and a specific gravity of 2.62. No air entrainment is required. The cement relative density is 3.15. 1- Design the concrete mix according to ACI method satisfying the above requirements (find water, cement, fine and coarse aggregate masses (in kg/m³) and volumes (in m³) to form 1 m³ of concrete.).

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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For a design a concrete mix which is going to be used in Muğla the 28-day compressive strength of the concrete is required to be 30 MPa and slump of the fresh concrete is specified as 8-10 cm. Maximum size of the aggregate is 25 mm. Other necessary data are given as: Specific gravity of cement = 3.1 Bulk specific gravity of coarse aggregate = 2.68 Bulk specific gravity of fine aggregate = 2.64 Absorption capacity of both aggregates is 1.5% Fineness modulus of fine aggregate = 2.8 Dry rodded unit weight of the coarse aggregate = 1600 kg/m³ According to ACI 211 and based on absolute volumes: What should be the weight of SSD coarse aggregate in kg's? What should be the amount of mixing water in kg's? What should be the water to cement ratio? What should be the volume of dry rodded coarse aggregate per unit volume of concrete? What should be the air content in 96? What should be the SSD weight of fine aggregate in kg's? Seç Seç... Seç Seç... # Seç + Seç... # # + ÷
We require a mix with a mean 28-day Required Average Compressive Strength of 35 MPa the size of the member and the spacing of the reinforcement require a slump of 50 mm and a maximum size of aggregate of 31 mm. Portland cement type I is used with specific gravity of 3.15, dry-rodded unit weight of coarse aggregate 1750 kg/m³ and bulk specific gravity (SSD) of 2.55. The fineness modulus of fine aggregate is 2.8 and bulk specific gravity (SSD) of 2.5 ,No air entrainment is required. Neglect water absorption and moisture content of both aggregates. The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse aggregate and water) for 1m³ concrete.
We require a mix with a mean 28-day compressive strength of 40 MPa the size of the member and the spacing of the reinforcement require a slump of 45 mm and a maximum size of aggregate of 28 mm. Portland cement type I is used with specific gravity of 3.15, dry-rodded unit weight of coarse aggregate 1750 kg/m³ and bulk specific gravity (SSD) of 2.55. The fineness modulus of fine aggregate is 2.8 and bulk specific gravity (SSD) of 2.5 ,No air entrainment is required. Neglect water absorption and moisture content of both aggregates. The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse aggregate and water) for 1m³ concrete.
Q1: Prepare mix design for given data • The 28-day compressive strength should be 34 MPa, The slump should be between 75 mm and 100 mm and the maximum aggregate size should not exceed 19 mm The properties of the materials are as follows: • Cement : Type I, specific gravity = 3.15 • Coarse Aggregate: Bulk specific gravity= 2.65; absorption capacity = 0.5%; dry-rodded unit weight = 1605 kg/m3, surface moisture = 1% • Fine Aggregate: Bulk specific gravity= 2.60; absorption capacity = 1.1%; fineness modulus = 2.70; surface moisture = 3%
Consider the following example: The 28-day compressive strength should be 4,000 psi. The slump should be between 3 and 4 in. and the maximum aggregate size should not exceed 1 in. The coarse and fine aggregates in the storage bins are wet. The properties of the materials are as follows: • Cement: Type I, specific gravity = 3.15 • Coarse Aggregate: Bulk specific gravity (SSD) = 2.87; absorption capacity= 1.6%; dry-rodded unit weight = 121 lb./ft.3 surface moisture = 0.75% • Fine Aggregate: Bulk specific gravity (SSD) = 2.67; absorption capacity= 1.3%; fineness modulus = 2.70; surface moisture 1.12%
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Design a Mix for the following Data. Specified strength = (99.5) MPa, Required Slump = 80 mmMaximum size of aggregate = 25 mm, FM of fine aggregate = 2.40Grading of aggregate as satisfied by ASTM C33 (American Society for Testing and Materials)SSD specific gravity of fine and coarse aggregate = 2.75Rodded bulk density of coarse aggregate = 1600 kg/cubic mAbsorption Capacity of coarse aggregate = 0.9 %Absorption Capacity of fine aggregate = 0.5 %Moisture Content of fine and coarse aggregate = 2 %Exposure Conditions = Normal
Consider the following example: The 28-day compressive strength should be 4,000 psi. The slump should be between 3 and 4 in. and the maximum aggregate size should not exceed 1 in. The coarse and fine aggregates in the storage bins are wet. The properties of the materials are as follows: • Cement : Type l, specific gravity = 3.15 • Coarse Aggregate: Bulk specific gravity (SSD) = 2.70; absorption capacity = 1.1%: dry-rodded unit weight = 105 lb./ft.3 surface moisture = 1% • Fine Aggregate: Bulk specific gravity (SSD) = 2.67; absorption capacity = 1.3%; fineness modulus = 2.70; surface moisture = 1.5%
46.5 kg of fine aggregate is mixed with 72.3 kg of coarse aggregate. The fine aggregate has a moisture content of 2.0% and its absorption is 3.4% whereas the coarse aggregate has a moisture content of 1.3% and its absorption is 3.0%. Determine the amount of water required to increase the moisture content so that there is 1% free moisture in the aggregate blend.
Design a concrete mix for construction of an elevated water tank. Required Slump = 3”. Maximum Size of Aggregate is 19mm. The specified design strength of concrete is 30 MPa at 28 days measured on standard cylinders. The specific gravity of FA and C.A. are 2.65 and 2.7 respectively. The dry rodded bulk density of C.A. is 1600 kg/m3, and fineness modulus of FA is 2.80. Ordinary Portland cement (Type I) will be used. S.G. = 3.15 C.A. is found to be absorptive to the extent of 1% and free surface Fill also the table.
Design a concrete mix for the following performances and ingredients:• Compressive strength at 28 days = 32 MPa, slump 80 mm• Crushed coarse aggregate of max size 20 mm readily available• Fine aggregate is river sand, fineness modulus = 2.5• Specific gravity of combined aggregate =2.6• Water absorption of fine aggregate = 0.5%• Water absorption of coarse aggregate = 0.8%• Air-dry moisture content of coarse aggregate = 0.2%• Air-dry moisture content of fine aggregate = 0.4% Note: the constant k used to find the margin, which is in turn used to determine the target compressive strength is as shown the table below: k for 10 % defectives = 1.28 k for 5% defectives = 1.64 k for 2.5% defectives= 1.96 k for 1% defectives= 2.33
Design a concrete mix for the following performances and ingredients:• Compressive strength at 28 days = 32 MPa, slump 80 mm• Crushed coarse aggregate of max size 20 mm readily available• Fine aggregate is river sand, fineness modulus = 2.5• Specific gravity of combined aggregate =2.6• Water absorption of fine aggregate = 0.5%• Water absorption of coarse aggregate = 0.8%• Air-dry moisture content of coarse aggregate = 0.2%• Air-dry moisture content of fine aggregate = 0.4%