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CHAPTER 1

INTRODUCTION

The primary concern of civil engineering profession is the construction of building. In

addition, it is most challenging, complicated and articulate work in the field of construction. It

embraces the whole aspect of building a structure from laying out till the last touch of finishing

work. It is according to Max B. Fajardo.

Concrete has been used since ancient times. Regular Roman concrete for example was

made from volcanic ash (pozzolana), and hydrated lime. Roman concrete was superior from

other concrete recipes (for example, those consisting of only sand and lime) used by other

nations. Besides volcanic ash for making regular Roman concrete, brick dust can also be

utilized. Besides regular Roman concrete, the Romans also invented hydraulic concrete, which

they made from volcanic ash and clay.

Regular concrete is the lay term for concrete that is produced by following the mixing

instructions that are commonly published on packets of cement, typically using sand or other

common material as the aggregate, and often mixed in improvised containers. The ingredients

in any particular mix depends on the nature of the application. Regular concrete can typically

withstand a pressure from about 10 MPa (1450 psi) to 40 MPa (5800 psi), with lighter duty

uses such as blinding concrete having a much lower MPa rating than structural concrete. Many

types of pre-mixed concrete are available which include powdered cement mixed with an

aggregate, needing only water.

Modern concrete mix designs can be complex. The choice of a concrete mix depends

on the need of the project both in terms of strength and appearance and in relation to local

legislation and building codes.

https://en.wikipedia.org/wiki/Volcanic_ashhttps://en.wikipedia.org/wiki/Pozzolanhttps://en.wikipedia.org/wiki/Hydrated_limehttps://en.wikipedia.org/wiki/Hydraulic_cementhttps://en.wikipedia.org/wiki/Volcanic_ashhttps://en.wikipedia.org/wiki/Clayhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/Clayhttps://en.wikipedia.org/wiki/Volcanic_ashhttps://en.wikipedia.org/wiki/Hydraulic_cementhttps://en.wikipedia.org/wiki/Hydrated_limehttps://en.wikipedia.org/wiki/Pozzolanhttps://en.wikipedia.org/wiki/Volcanic_ash

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The design begins by determining the requirements of the concrete. These

requirements take into consideration the weather conditions that the concrete will be exposed

to in service, and the required design strength. The compressive strength of a concrete is

determined by taking standard molded, standard-cured cylinder samples.

Although concrete is the most popular construction material, it has some limited

properties: low tensile strength, low ductility, low energy absorption, and shrinkage and

cracking associated with hardening and curing (Wang et al. 2000). Several studies performed

recently showed application of the recycled tire rubber might improve these weak

characteristics of concrete. Since a number of ways to use the recycled rubber in the concrete

design are possible and there are still many factors and properties that should be investigated

it may be difficult to expect that mass production-base rubberized concrete is able to be

available in the market today or next week. However, many study results have proven the

mechanical and environmental advantages of the use of recycled tire as addition to cement

concrete.