Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following conditions are recommended for using sulphate resisting cement? 1. Concrete to be used in foundation and basement, where soil is not infested with sulphates 2. Concrete used for fabrication of pipes which are likely to be buried in marshy region or sulphate bearing soils 3. Concrete to be used in the construction of sewage treatment works

Which of the following conditions are recommended for using sulphate resisting cement? 1. Concrete to be used in foundation and basement, where soil is not infested with sulphates 2. Concrete used for fabrication of pipes which are likely to be buried in marshy region or sulphate bearing soils 3. Concrete to be used in the construction of sewage treatment works Correct Answer 2 and 3 only

Concept:

Sulphate Resisting Cement (SRC): In this cement the amount of tricalciumaluminate (C3A) is restricted to an acceptably low value generally less than 5%. It is recommended for use inaggressive sulphate-rich environments where the concrete is exposed to the risk of deterioration and spalling due to sulphate attack.

Statement 1: SRC should not be used in concrete to be used in foundation and basement, where soil is not infested with sulphates because SRC is generally used in concrete which is in contact with soils or ground waters containing excessive sulphate.

Statement 2: SRC should be used in concrete used for fabrication of pipes which are likely to be buried in marshy region or sulphate bearing soils because it has the risk of deterioration due to sulphate attack.

Statement 3: SRC should be used in concrete to be used in the construction of sewage treatment works because sewage water often contain excessive amount of sulphates.

∴ SRC should be used in the conditions described in statement 2 & statement 3.

Related Questions

Consider the following statements and state what is not true of the Alluvial Soils? (a) Alluvial soils are the most widely spread soils. (b) Alluvial soils as a whole are very fertile. (c) On the basis of their age they are classified into two - old: Bangar and new: khadar. (d) Khadar soils are more fertile than Bangar (e) Alluvial soils contain an adequate proportion of potash, phosphoric acid and lime (f) Alluvial soils are ideal for sugarcane, paddy, wheat and pulses. 
There are 12 pipes connected to a tank. Some of them are fill pipes and other are drain pipes. Each of the fill pipes can fill the tank in 8 hours and each of the drain pipes can drain completely in 6 hours. If all the pipes are kept open, an empty tank get filled in 24 hours. How many of the 12 pipes are filled pipes?
Five pipes P, Q, R, S, and T can fill a tank in 60 minutes, 20 minutes, 30 minutes, 8 minutes, 32 minutes respectively. Out of these five pipes, two have now been converted into emptying pipes such that their efficiency remains the same. When only one of the filling pipes and one of the emptying pipes operate, the tank can be filled in 60 minutes while another combination of emptying and filling pipe empties it in 8/45th of the time taken by the previous combination to fill the tank. Which pipes are converted into emptying pipes?
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it. The Alaska pipeline starts at the frozen edge of the Arctic Ocean. It stretches southward across the largest and northernmost state in the United States, ending at a remote ice-free seaport village nearly 800 miles from where it begins. It is massive in size and extremely complicated to operate. The steel pipe crosses windswept plains and endless miles of delicate tundra that tops the frozen ground. It weaves through crooked canyons, climbs sheer mountains, plunges over rocky crags, makes its way through thick forests, and passes over or under hundreds of rivers and streams. The pipe is 4 feet in diameter, and up to 2 million barrels (or 84 million gallons) of crude oil can be pumped through it daily. Resting on H-shaped steel racks called "bents", long sections of the pipeline follow a zigzag course high above the frozen earth. Other long sections drop out of sight beneath spongy or rocky ground and return to the surface later on. The pattern of the pipeline's up-and-down route is determined by the often harsh demands of the arctic and subarctic climate, the tortuous lay of the land, and the varied compositions of soil, rock, or permafrost (permanently frozen ground). A little more than half of the pipeline is elevated above the ground. The remainder is buried anywhere from 3 to 12 feet, depending largely upon the type of terrain and the properties of the soil. One of the largest in the world, the pipeline cost approximately $8 billion and is by far the biggest and most expensive construction project ever undertaken by private industry. In fact, no single business could raise that much money, so 8 major oil companies formed a consortium in order to share the costs. Each company controlled oil rights to particular shares of land in the oil fields and paid into the pipeline-construction fund according to the size of its holdings. Today, despite enormous problems of climate, supply shortage, equipment breakdowns, labour disagreements, treacherous terrain, a certain amount of mismanagement, and even theft, the Alaska pipeline has been completed and is operating.
How was the fund for pipeline - construction generated?
Consider the following statements and choose the correct answer:
1. Soil gets heat energy from different sources such as solar radiation, decomposing organic matter and heat formed in the interior of earth
2. The temperature of soil is not affected by its colour and altitude of the land
3. Black soils absorb more heat than white soils
4. Sandy soils absorb more heat and radiate it out quickly at night than clay or loam soils
Consider the following statements: Problem regarding foundations to be constructed in expansive soils are solved by 1. Resorting to light foundation pressure. 2. Using under-reamed piles for light loads 3. Making the structure rigid enough so that settlement and uplift would not affect them 4. Providing a well-designed basement with the foundation below the neutral point Which of the above statements are correct?
Censider the following statements
1. Soils of Terai region are rich in nitrogen and organic matter but are deficient in phosphate.
2. Humid climate, marshy land and fertile soil are main features of the Terai region.
Which of the statements given above is/are correct?
Consider the following two statements regarding Bearing stiffeners provided at the location of a concentrated load: 1. Bearing stiffeners have to resist bearing and buckling loads. 2. Bearing area and the area resisting buckling load are the same. Which of the above statements is/are correct ?
The below question contains a paragraph of 6 sentences. The first and the sixth sentences are given in the beginning and end and numbered 1 and 6 respectively. The four sentences in the middle are jumbled and labelled P, Q, R and S. Identify the proper order of these four sentences and mark the correct option. 1. Soil is an invaluable natural resource. P. On the other hand, the type of soil determines the flora and fauna of the region. Q. The soil and the living organisms of a region are inter-dependent. R. On the one hand, soil is affected by the flora and fauna of the region. S. It provides raw materials for the plants on which we depend for food. 6. Consequently, do-age to the soil will destroy the balance of nature.
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it. The Alaska pipeline starts at the frozen edge of the Arctic Ocean. It stretches southward across the largest and northernmost state in the United States, ending at a remote ice-free seaport village nearly 800 miles from where it begins. It is massive in size and extremely complicated to operate. The steel pipe crosses windswept plains and endless miles of delicate tundra that tops the frozen ground. It weaves through crooked canyons, climbs sheer mountains, plunges over rocky crags, makes its way through thick forests, and passes over or under hundreds of rivers and streams. The pipe is 4 feet in diameter, and up to 2 million barrels (or 84 million gallons) of crude oil can be pumped through it daily. Resting on H-shaped steel racks called "bents", long sections of the pipeline follow a zigzag course high above the frozen earth. Other long sections drop out of sight beneath spongy or rocky ground and return to the surface later on. The pattern of the pipeline's up-and-down route is determined by the often harsh demands of the arctic and subarctic climate, the tortuous lay of the land, and the varied compositions of soil, rock, or permafrost (permanently frozen ground). A little more than half of the pipeline is elevated above the ground. The remainder is buried anywhere from 3 to 12 feet, depending largely upon the type of terrain and the properties of the soil. One of the largest in the world, the pipeline cost approximately $8 billion and is by far the biggest and most expensive construction project ever undertaken by private industry. In fact, no single business could raise that much money, so 8 major oil companies formed a consortium in order to share the costs. Each company controlled oil rights to particular shares of land in the oil fields and paid into the pipeline-construction fund according to the size of its holdings. Today, despite enormous problems of climate, supply shortage, equipment breakdowns, labour disagreements, treacherous terrain, a certain amount of mismanagement, and even theft, the Alaska pipeline has been completed and is operating.
Which of the following were not problems faced while constructing the pipeline?