Consider the following statements: 1) Rich mixes are less prone to bleeding than lean ones 2) Bleeding can be reduced by increasing the fineness of cement Which of the above statements is /are correct?

1 only
2 only
Both 1 and 2
neither 1 nor 2

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 3 : Both 1 and 2

Lean concrete contains less cement and more water as compared to rich mix concrete.
In lean concrete, Water is pushed upwards because it has low specific gravity compared to other materials in concrete. Hence lean mix concrete is more prone to bleeding than rich mix concrete.
Rich mix has sufficient cement aggregates, and less water as compared to lean mix hence it will have a proper lubrication, thus increasing workability.

Bleeding
Definition	In bleeding, the water present in the concrete mix is pushed upwards due to the settlement of cement and aggregate. Water is pushed upwards because it has low specific gravity compared to other materials in concrete.
Remedies	Reduce the water content in the concrete. Use air-entraining admixtures in concrete. Add more cement in the mix (Rich mix). Increasing the amount of fine sand in concrete. Using finer cement.

5 views Answered 2022-09-04 04:29

Related Questions

Consider the following statements: 1. f(x) = In x is an increasing function on (0, ∞). 2. f(x) = ex – x (In x) is an increasing function on (1, ∞) Which of the above statements is/are correct?

1 Answers 4 Views

Which of the following statements are correct with regard to cement mortar 1. Workability of cement mortar can be improved by addition of lime. 2. Fly-ash cement is economical in plastering jobs. 3. Addition of saw dust improves workability 4. Sand in mortar can be replaced by finely crushed fire bricks?

1 Answers 4 Views

Which of the following statements is/are correct regarding the strength of cement 1) Particle sizes less than 3 μm increase the viscous nature of the cement. 2) Finer particles in cement can be replaced by fly-ash to improve the strength.?

1 Answers 4 Views

The collection efficiency of cyclone separators increases with: 1) Decreasing particle size 2) Increasing particle density 3) Decreasing gas velocity 4) Increasing number of gas revolutions 5) Increasing cyclone diameter Which of the above statements are correct?

1 Answers 4 Views

Oxides of nitrogen in Petrol engine exhaust can be reduced by the following methods: 1. Use of 5% lean mixture 2. Advancing the spark timing 3. Recirculating a fraction of exhaust gas 4. Using an oxidation catalyst in the exhaust manifold Which of the above statements is/are correct?

1 Answers 4 Views

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?

1 Answers 7 Views

Consider the following statements for the design of a laced column: 1) In a bolted construction, the minimum width of the lacing bar shall be three times the nominal diameter of the end bolt. 2) The thickness of the flat of a single lacing system shall be not less than one-fortieth of its effective length 3) The angle of inclination of the lacing bar should be less than 40° with the axis of the built-up column 4) The lacing shall be designed for a transverse shear of 2.5% of the axial load on the column Which of the above statements are correct?

1 Answers 9 Views

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?

1 Answers 8 Views

Consider the following statements about thermal conductivity: 1) Thermal conductivity decreases with increasing molecular weight 2) Thermal conductivity of non-metallic liquids generally decreases with increasing temperature 3) Thermal conductivity of gases and liquids is generally smaller than that of solids Which of the above statements are correct?

1 Answers 5 Views

Which of the following statements are correct about the sex ratio (number of females per 1000 males) in Rajasthan according to census 2011 (i) Sex ratio in Rajasthan in 2011 was less than the National average. (ii) Sex ratio in all Districts of Rajasthan in 2011 was less than 1000. (iii) Sex ratio in rural areas of all districts of Rajasthan in 2011 was less than 1000, except Pali District. (iv) Sex ratio in urban areas of all Districts of Rajasthan in 2011 was less than 1000, except Dhaulpur District. Select the correct answer using the codes given below:?

1 Answers 4 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)