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The following statements (S1, S2, S3) pertain to mass concreting. Which of the following statements are correct? S1: The materials preferred for mass concrete are: Portland cement with low heat of hydration, Pozzolanas, Aggregates (coarse and fine), Water, Admixture, Coolants. S2: Slump of mass concrete shall be the same or more than ordinary concrete work. S3: Concrete with a low water cement ratio, correctly consolidated and properly cured provides durability to mass concrete work.
A shopkeeper earns a profit of 15% if he mixes 85 kg of A-type cement with 35 kg of B-type cement and sells the mixture at Rs. 46 per kg. He can increase his profit to 25% if he mixes 65 kg of A-type cement with 35 kg of B-type cement and sells the mixture at Rs. 46.5 per kg. At what price should he sell a mixture of 30 kg A-type cement and 50 kg B-type cement to earn a profit of 75%?
Consider the following statements: 1) Hydrophobic cement grains possess the low wetting ability 2) Rapid-hardening cement is useful in concreting under static, or running water 3) Quick-setting cement helps the concrete to attain high strength in the initial period 4) White cement is just a variety of ordinary cement-free of coloring oxides. Which of the above statements are correct?
Thickness of 8 tyres L, M, N, O, P, Q, R and S is compared. Thickness of no two tyres is same. Thickness of N is more than L but less than 6 tyres. Thickness of O is more than M but less than Q. Thickness of P is less than only two tyres. Thickness of Q is not more than P. Which of the following statement is not correct?
Consider the following statements: 1. If more water is added to concrete for increasing its workability, it results into concrete of low strength. 2. No slump is an indication of a good workable concrete. 3. Higher the slump of concrete, lower will be its workability. 4. Workability of concrete is affected by water content as well as water-cement ratio. Which of the above statements are correct?
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
Permeability in concrete is studied towards providing for, or guarding against, which of the following features? 1. The penetration by materials in solution may adversely affect the durability of concrete; moreover, aggressive liquids 'attack' the concrete. 2. In the case of reinforced concrete, ingress of moisture and air will result in corrosion of steel leading to an increase in the volume of steel, resulting in cracking and swilling of the concrete cover. 3. The moisture penetration depends on permeability and if the concrete can become saturated with water it is less vulnerable to frost action.
A construction company purchases cement at the rate of Rs. 1,000 per tonne and stores it at Rs. 100 per tonne. It is perceived that in the coming month, the price of cement will rise by Rs. 2,000 per tonne. The company already has 500 tonnes of cement. If the cement usage during a month is 1,000 tonnes, how much cement should the company purchase this month to minimize its expense in the next one?
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Concrete is the most widely used material in existence and is only behind water as the planet's most-consumed resource. B: Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. C: Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together.  D: A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together.