1- In compression, the failure mode is . 2- Shear strength is approximately 3- 4- Used air- entraining admixture.. . the segregation 5- When a lean mix concrete is used, the coarser particles tend to 6- flow test laboratory test gives an indication of the .. .of concrete of the uniaxial compressive strength .. .defined as the total volume of the overall volume of pores 7- . is the property most valued by designers and quality control ......

1- In compression, the failure mode is . 2- Shear strength is approximately 3- 4- Used air- entraining admixture.. . the segregation 5- When a lean mix concrete is used, the coarser particles tend to 6- flow test laboratory test gives an indication of the .. .of concrete of the uniaxial compressive strength .. .defined as the total volume of the overall volume of pores 7- . is the property most valued by designers and quality control ......

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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Design the concrete mix according to the following conditions:Design Environment• Concrete slabo Subjected to freeze and thaw.o Required design strength = 21 MPao Slab thickness = 300 mm.o Statistical data indicate a standard deviation of compressive strengthof 1.7 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Available Materials:o Air entrainer:▪ Manufacture specification is 9.5 mL/1% air/100 kg cement.o Coarse aggregate:▪ 25 mm nominal maximum size▪ Crushed stone▪ Bulk oven-dry specific gravity = 2.573▪ Absorption = 2.8▪ Oven-dry rodded density = 1922 kg/m3▪ Moisture content = 1o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.540▪ Absorption = 3.4▪ Moisture content = 4.5▪ Fineness modulus = 2.60o Cement:▪ Type I Cement▪ Specific gravity = 3.15…
Design the concrete mix according to the following conditions:Design Environment• Concrete slabo Subjected to freeze and thaw.o Required design strength = 21 MPao Slab thickness = 300 mm.o Statistical data indicate a standard deviation of compressive strengthof 1.7 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Available Materials:o Air entrainer:▪ Manufacture specification is 9.5 mL/1% air/100 kg cement.o Coarse aggregate:▪ 25 mm nominal maximum size▪ Crushed stone▪ Bulk oven-dry specific gravity = 2.573▪ Absorption = 2.8▪ Oven-dry rodded density = 1922 kg/m3▪ Moisture content = 1o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.540▪ Absorption = 3.4▪ Moisture content = 4.5▪ Fineness modulus = 2.60o Cement:▪ Type I Cement▪ Specific gravity = 3.15Find the required quantities of cement, water, coarse aggregate, fine aggregate, aircontent, and admixture per 1 m3 of concrete. Summarize the findings in a table.Based on this information, find the…
Design the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebar = 40 mmMinimum cover over rebar = 40 mmStatistical data indicate a standard deviation of compressive strength of2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification 6.3 mL/1% air/100 kg cement.Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded)Bulk oven-dry specific gravity = 2.55, absorption = 3.6,Oven-dry rodded density = 1761 kg/m3Moisture content = 2.5,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.659, absorption = 0.5,Moisture content = 2,Fineness modulus = 2.47
Q3/: TILM We require a mix with a mean 28-day compressive strength of 26.5 MPa) the size of the member and the spacing of the reinforcement require a slump of 50 mm and a 3 maximum size of aggregate of 20 mm. Portland cement type I is used with specific gravity of 3.15, dry-rodded unit weight of coarse aggregate 1700 kg/m 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.
Design the concrete mix according to the following conditions:Design Environment• Building beamo Required design strength = 27.6 MPao Minimum dimension = 150 mmo Minimum space between rebar = 40 mmo Minimum cover over rebar = 40 mmo Statistical data indicate a standard deviation of compressive strengthof 2.1 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Moderate Sulphate exposure.• Available Materialso Air entrainer:▪ Manufacture specification 6.3 mL/1% air/100 kg cement.o Coarse aggregate:▪ 19 mm nominal maximum size▪ River gravel (rounded)▪ Bulk oven-dry specific gravity = 2.55▪ Absorption = 3.6▪ Oven-dry rodded density = 1761 kg/m3▪ Moisture content = 2.5o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.659▪ Absorption = 0.5▪ Moisture content = 2▪ Fineness modulus = 2.47o Cement▪ Type II (Moderate Sulphate Resistant)▪ Specific Gravity = 3.15Based on this information, find the following and summarize the findings in a table d) The amount…
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Which one of the following sentences is not correct? a.For many years, tensile strength has been measured in terms of the compressive strength. b.The modulus of rupture where the normal-weight concrete has an fc of 4000 psi is 474 psi. c.For lightweight concretes tensile strength depends largely on the porous aggregate. d.For normal weight concrete, the tensile strength depends primarily on the strength of bond between hardened cement paste and aggregate.
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.
design a concrete mix to make 9 m3 of fresh concrete the concrete is located near the sea select the design strength according to the last number in your ID number selected design strength last number 0 1 2 3 4 5 6 7 8 9 B210 B230 B280 B290 B320 B340 B360 B370 B380 B410 note: use W/C method fineness modulas = 2.85, coarse agg RDssd = 2.67 fine agg RDss = 2.65 part 2: modify the mix if the used coarse aggregate was totaly dry with absorption %=1.5%
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Design the concrete mix according to the following conditions:Design EnvironmentPavement slab, Bozeman, Montana (cold climate)Required design strength = 3000 psiSlab thickness = 12 in.Statistical data indicate a standard deviation of compressive strength of250 psi is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 0.15 fl oz/1% air/100 lb cement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 120 pcfMoisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68
Design a concrete mix for the following conditions and constraints using the absolute volume method:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebars = 40 mmMinimum cover over rebars = 40 mmStatistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples)Only air entrainer is allowedAvailable MaterialsAir EntrainerManufacturer specification 6.3 ml/1% air / 100 kg cementCoarse aggregate19 mm nominal maximum size, river gravel (rounded)Bulk oven dry specific gravity = 2.55, Absorption = 0.3%Oven dry-rodded density = 1761 kg/m3Moisture content = 2.5%Fine aggregateNatural sandBulk oven-dry specific gravity = 2.659, Absorption = 0.5%Moisture content = 2%Fineness modulus = 2.47