In the context of provisions relating to durability of concrete, consider the following assertion: Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required fo concrete exposed to marine environment. Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K₂O, respectively, is approximately 1.4% (rounded decimal place). Which one of the following statements is correct? A. Assertion (1) is true and Assertion (2) is FALSE B. Both Assertion (1) and Assertion (2) are TRUE C. Both Assertion (1) and Assertion 2) are FALSE

In the context of provisions relating to durability of concrete, consider the following assertion: Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required fo concrete exposed to marine environment. Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K₂O, respectively, is approximately 1.4% (rounded decimal place). Which one of the following statements is correct? A. Assertion (1) is true and Assertion (2) is FALSE B. Both Assertion (1) and Assertion (2) are TRUE C. Both Assertion (1) and Assertion 2) are FALSE

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The recommended dosage on a viscosity modifying admixture is 5 fl oz/cwt. The proportions of the concrete mix by weight were; Coarse aggregate = 1800 lb Fine aggregate = 1120 lb Cement = 480 lb Fly ash = 140 lb water = 280 lb What dosage of admixture should be added?
All information given
We need to solve them all. Just the right choice
The composition of an air-entrained concrete is given below: Water: 184 kg/m³ Ordinary Portland cement (OPC): 368 kg/m³ Sand: 606 kg/m³ Coarse aggregate: 1155 kg/m³ Assume the specific gravity of OPC, sand and coarse aggregate top be 3.14, 2.67 and 2.74, respectively. The air content is litres/m³.
A modulus of rupture test is conducted on an MgO refractory brick with the following data obtained: F = 7*10^4 N L = 175 mm b = 110 mm h = 75 mm If the designer were to reduce the height of the refractory brick to only h=64mm, what would be the new necessary load F to break the refractory? Your answer should be in units of Newtons (N).
After placement, the temperature of the concrete was measured and recorded by thermal sensors during the first 7 days. The temperature change with time is given in the figure below and the datum temperature of the concrete mix is known to be -5°C. If formworks are planned to be removed when 70% of maturity of the laboratory samples cured at 20 °C for 7 days is reached, what is the formwork removal time? temperature (°C) 30 28 26 mm O d. 24 O e 22 20 18 16 14 12 10 OaEarlier than 3.5 days 0 12 24 36 Ob Between 40 to 45 days OF Between 4.5 to 5 days Between 3.5 to 4 days Later that 5 days 48 60 72 84 96 108 120 132 144 156 168 age (hour)
An air-entrained concrete mix is required for a structure that is severely exposed to sulfate. Given: Required strength 35 MPa; slump 80 mm; Coarse aggregate: 19 mm nominal maximum size. The amount of water required for this mix and the corresponding air content respectively are Select one: O A. 190 Kg and 2% O B. 184 Kg and 6% O C. 184 Kg and 3.5% O D. 205 Kg and 2%
concrete technology//theory part.
Concrete Technology// Practical parts: Please , keep the answers to the questions as short and meaningful as possible , thank you very much.
From the knowledge of the effects of GGBS, PFA and microsilica, indicate whether their inclusion to provide a concrete of equivalent 28 day strength, is likely to enhance or reduce resistance to each of the processes stated below: i. Alkali Silica Reaction (ASR) in concrete ii. Chloride ingress in concrete (not corrosion)
Given cement compounds: C3A = 7.3% C4AF = 12.2% C3S = 48.4% C2S = 29.7% What should be made in terms of sourcing raw materials if the manufacture wants to produce a Sulphate Resisting Portland Cement? Compare and contrast between Ordinary Portland Cement and Sulphate Resisting Portland Cement.
Designing a concrete that will be exposed to groundwater, the chemical analysis of which is given in Table 1. is requested. a) For 1 m3 of concrete, assuming the air gap is 1%, according to the relevant impact class specified in TS EN 206 Calculate the amount of material needed. (Maximum grain size of A1, A2, A3 aggregates to be used in the mixture) has a diameter of 16 mm and is in SDYK state, and the physical properties and mixing ratios of the aggregates are given in Table 2.) b) The ratio of cement kneading water to be used in production is 28%, volumetric shrinkage of cement paste Calculate the shrinkage that will occur in the concrete, assuming that the absolute volume of cement is 1%. from shrinkage Find the tensile stress that will occur in the concrete due to Whether cracks will occur in the concrete due to shrinkage, Considering the static elasticity modulus (secant modulus) of the concrete given below in the “stress-strain” diagram. take it and check it. Note: In the…