In the SSC JE Exam for Civil Engineering, the questions on Concrete Technology typically cover various aspects of concrete, including its properties, advantages, uses, and related concepts.
In this blog, we’ll provide you with some questions that you can expect in the upcoming exam.
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You can expect questions related to:
1. Increase in the moisture content in concrete
(a) Reduces the strength
(b) Increases the strength
(c) Does not change the strength
(d) None of these
Sol-(a)
2. The shrinkage of concrete
(a) Is proportional to water content in the mix
(b) Is proportional to cement content
(c) Increase with age of concrete
(d) (a) & (b) both
Sol-(d)
The term “Shrinkage” is commonly used to describe various volume changes in concrete resulting from moisture loss at different stages for various reasons. Shrinkage can be categorized into the following types:
1. Plastic Shrinkage:
2. Drying Shrinkage:
3. Thermal Shrinkage:
4. Carbonation Shrinkage:
3. Which of the following method may be used for getting a more workable concrete?
(a) By increasing cement content
(b) By decreasing water-cement ratio
(c) By using angular aggregates in place of rounded ones
(d) By reducing the size of aggregates
(e) None of these
Sol-(a)
4. Air entrainment in the concrete increases:
(a) Workability
(b) Strength
(c) The effect of temperature variation
(d) The unit weight
Sol-(a)
Air entrainment in concrete introduces millions non-collapsing air bubbles, which function as flexible ball bearings and alter the properties of concrete in several ways:
1. Increase in Workability:
Air entrainment enhances the workability of concrete, making it easier to handle and place. The tiny air bubbles act as lubricants, improving the flow of the mix.
2. Increase in Resistance to Freezing and Thawing:
The presence of air bubbles helps concrete resist damage from freeze-thaw cycles. When water freezes and expands, these bubbles provide space for the ice to occupy, reducing the risk of cracking.
3. Decrease in Segregation, Bleeding, and Permeability:
Air entrainment minimizes the separation of ingredients in the concrete mix, preventing segregation and bleeding. It also reduces permeability, making the concrete less prone to moisture penetration.
4. Increased Resistance to Chemical Attack:
Air-entrained concrete exhibits improved resistance to chemical substances, which can help prolong its durability in aggressive environments.
5. Steam curing of concrete is adopted for
(a) Precast structure
(b) Columns
(c) Beams
(d) Walls
Sol-(a)
Here are some key effects and benefits of steam curing:
1. Accelerated Strength Development
2. Reduction in Shear Strength
3. Increased Resistance to Sulphate Action
4. Enhanced Resistance to Freezing and Thawing
It’s essential to thoroughly study the principles and practices of concrete technology, as these questions can vary in complexity and cover a wide range of topics related to concrete materials and their applications in construction. Be sure to refer to the official SSC JE syllabus and previous year’s question papers to get a better understanding of the specific topics and question formats that may appear in the exam.
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