Part I Multiple Choice 2x1020 pts 1 Which flooring is best f

Part I. Multiple Choice (2\'x10-20 pts) 1. Which flooring is best for heavy traffic? A. vitrified tiles B. vinyl tile C. granite tile D. place concrete 2. What is concrete curing? A. Fast drying of concrete B. voids in concrete after drying C. retaining of water through hydration D. mixing of water and cement 3. Which of the following is the important component to determine the strength of concrete? A. B. C. D. cement mixture water cement ratio amount of cement water ratio 4. Which type of steel can be identified with two grade lines? A. grade 75 B. grade 60 C. grade 40 D. grade 420 cylinders made A strength test shall be the average of the strengths of from the same sample of concrete and tested at for determination of fe 5. days or at test age designated A. 3, 28 B. 1, 56 C. 4, 56 D. 2, 28

Solution

1. (B) vinyl tile

Perhaps one of the best materials when it comes to finding flooring that is both comfortable, stylish and capable of handling heavy foot traffic is vinyl. Easy to install, vinyl flooring is soft underfoot – an added bonus if it’s being used in a busy area of the home.

2. (C) Retaining of water through hydration

Curing is the maintaining of an adequate moisture content and temperature inconcrete at early ages so that it can develop properties the mixture was designed to achieve. Curing begins immediately after placement and finishing so that theconcrete may develop the desired strength and du- rability.

3. (B) Water Cement ratio

The water cement ratio has a direct relation with the strength of concrete.water cement ratio law states that the strength of concrete is only dependent upon w/c ratio provided the mix is workable.

When the w/c ratio increases beyond the practical limit the concrete exibits a tendency for separation of constituent particles ( Segregation ) and some of the water also comes out of concrete(Bleeding) being of the lowest specific gravity among all the ingredients of concrete.

If the w/c ratio is more than 0.7,the bleeding channels remains continuous which results in accumulation of water reduces the bond between the aggregates and the paste.

This ultimately reduces the compressive strength of concrete.

4. (A) grade 75

one line (60) or two lines (75), three lines (80, 100) and  four lines (120),

no grade marking for grade 40