What is the minimum strength that concrete must reach prior to freezing so that theoverall strength gain is not affected?OA 5.0 MPaO B) 2.5 MPaO0 4.5 MPaOD) 3.5 MPaWhen testing for organic impurities in Lab 4, which colour number was deemed to bethe limit for acceptable organics in the fine aggregate.ON 1O B) 2O D) 3Concrete is required for the construction of an agricultural dairy barn floor slab inCentral Alberta. The floor slab will be exposed to freeze/thaw conditions. Which ofthe following exposure classes best describes the environmental conditions that theconcrete will be exposed to?O Al A-4O B) S-2O D) A-2Slow setting may be caused by:O A Prolonged cold weather when protection is not provided to keep the concretewarmO B) Not having enough fly ash in the concreteOC) Cold as-delivered concrete placed during hot weatherOD) Not enough water in the concrete to fully hydrate the cement< O O

The minimum strength that concrete mus overall strength gain is not affected:

Answered: What is the minimum strength that…

What is the minimum strength that concrete must reach prior to freezing so that the overall strength gain is not affected? ON SO MPa O B) 2.5 MPa O045 MPa O DI 35 MPa

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…
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ve st Semest desi Q4) Concrete is required for walls of a building that will be moderately exposed to Intrained 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 strengthe 3 concrete at 28 days is 21.5 MPa and a slump of 50 mm. Portland cement type I is used with specific gravity of 3.15, maximum size of aggregate 25 mm and fineness modulus of fine aggregate is 2.4, absorption capacity and moisture content of fine aggregate are of 0.8%, and 1.75% respectively. The dry-rodded unit weight of coarse aggregate is 1650 kg/m³, absorption capacity and moisture content of coarse aggregate are of 0.8%, and 1.75% respectively. Both aggregates have a bulk specific gravity (SSD) of (2.65. The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse 94 8.75 aggregate and water) for 1m³ concrete. Tooox 2.65 alka…
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