Question

PART-B
1. Explain: (a) Light weight concrete (b) Fibre reinforced concrete.​

Answer 1

Explanation:

A. Chaipanich, P. Chindaprasirt, in Eco-Efficient Masonry Bricks and Blocks, 2015

9.2 Types of lightweight concrete

Lightweight concrete can be classed according to its unit weight or density, which normally ranges from 320 to 1920 kg/m3, according to the ACI Committee 213 Guide for Structural Lightweight Aggregate Concrete (ACI 213, 2001). There are three different lightweight concrete type divisions in terms of strength range, which are low-density concretes (0.7–2.0 MPa), moderate-strength concretes (7–14 MPa) and structural concretes (17–63 MPa). The density of these concretes is in the range of 300–800 kg/m3, 800–1350 kg/m3 and 1350–≈1920 kg/m3 respectively. The use of lightweight concrete has been used since the early 1900s in the United States, and lightweight concrete has been used in multistory buildings, long span bridges, offshore platforms and large structures (Mindess, Young, & Darwin, 2003). A number of advantages in using low-density lightweight concrete in construction are due to its low density, low thermal conductivity, low shrinkage and high heat resistance, in addition to reduction in dead load, lower haulage cost and faster building rate (Wongkeo, Thongsanitgarn, Pimraksa, & Chaipanich, 2012).

Answer 2

Answer:

(a)Lightweight concrete based on miscanthus biomass has several advantages over mixtures based on sand or gravel, including better insulation properties, improved protection against overheating in summer, and high durability.

(b)Fiber-reinforced concrete is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented.

Explanation:

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