Q- A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm² intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly

Q- A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm² intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly

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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Similar questions

a) Use the British method to design an air-entrained concrete trial mix with a volume of (0.04) m?, if you know the following: - The characteristic compressive strength at 28 days is (33) MPa, and k = 1.64, s =7 MPa. - The used cement is sulfate resisting Portland cement, - The slump = 100 mm. - The maximum free water to cement ratio = 0.40 (by weight). - The minimum cement content = 400 kg/m®, - The maximum cement content = 650 kg/m’. - Air content = 6.5 %. - Maximum size of aggregate = 10 mm. - Type of aggregate: coarse: crushed, fine: uncrushed. - % passing (0.6) mm sieve for fine aggregate = 60%. (20%)
Concrete is required for a column that will be moderately exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.
Concrete is required for walls of a building that will be Severe Exposed to freezing and thawing. The cross section of a wall is 300 x 1500 mm. The smallest spacing between reinforcing steel is 50 mm. The Required Average Compressive Strength of concrete at 28 days is 40 MPa and a slump of 55 mm. Portland cement type I is used with specific gravity of 3.12, maximum size of aggregate 27 mm and fineness modulus of fine aggregate is 2.4, absorption capacity and moisture content of fine aggregate are of 0.92%, and 1.95% respectively. The dry-rodded unit weight of coarse aggregate is 1820 kg/m³, absorption capacity and moisture content of coarse aggregate are of 0.75%, and 1.85% respectively. Both aggregates have a bulk specific gravity (SSD) of (2.45). 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.
Group C: Design a concrete mix to implement a Mass concrete (exposed to sever conditions moisture and freezing and thawing) with design compressive strength 25 MPa, a standard deviation equals to 4 and the percentage expected less than minimum strength is 10%. Sulphate Resisting Portland Cement is used. The maximum size of an angular aggregate is 50 mm with apparent density 1500 kg/m3. The available fine aggregate has fineness modulus 2.4 an air entraining agent has been used in the mix.
The curing period should be as long as is practical. The minimum time depends on several factors, such as type of cement, mixture proportions, required strength, ambient weather, size and shape of the structure, future exposure conditions, and method of curing. For most concrete structures, the curing period at temperatures above 5°C should be a minimum of 7 days or until 70% of specified compressive or flexure strength is attained. The curing period can be reduced to 3 days if high early strength concrete is used and the temperature is above 10°C.
Concrete is required for a column that will be Severe Exposure to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 40 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 25 to 50 mm. The properties of materials are as follows: (a) Cement used is type I Portland cement with a specific gravity of 3.10. (b) The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.68, absorption capacity of 0.65%, and moisture content (SSD) of 0.27%. (c) The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.5%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.7,The aggregates conform to the ASTM C33-84 requirements for grading.
Concrete is required for a column that will be Severe exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The Required Average Compressive Strength of concrete at 28 days is 35 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.
Concrete is required for walls of a building that will be Mild Exposed to freezing and thawing. The cross section of a wall is 300 x 1500 mm. The smallest spacing between reinforcing steel is 50 mm. The specified compressive strength of Compressive strength of concrete at 28 days is 35 MPa and a slump of 55 mm. Portland cement type I is used with specific gravity of 3.12, maximum size of aggregate 27 mm and fineness modulus of fine aggregate is 2.4, absorption capacity and moisture content of fine aggregate are of 0.92%, and 1.95% respectively. The dry-rodded unit weight of coarse aggregate is 1820 kg/m³, absorption capacity and moisture content of coarse aggregate are of 0.75%, and 1.85% respectively. Both aggregates have a bulk specific gravity (SSD) of (2.45). 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.
For a design a concrete which will be exposed to seawater and sulfates in a structure that comprises thin members, the 28-day compressive strength 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 What should be the weight of dry weight of coarse aggregate in kg's? What should be the weight of fine aggregate in kg's? What should be the water to cement ratio? Seç... ÷ Seç... + Seç...
If width of the expansion joint is 1.7 m in a cement concrete pavement. The laying temperature is 38°C and the maximum slab temperature in summer is 50°C. The coefficient of thermal expansion of concrete is 4 x 10-5 mm/mm / °C and the joint filler compresses upto 28% of the thickness. The spacing between expansion joints is S mm then Value of S is mm.
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 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 out the table below.