Abstract
Good-quality reinforced cement concrete is made from cement, sand, aggregate, water, and reinforcement, and so is bad-quality concrete. The quality of concrete, in fact, mostly depends on operations like mixing, transporting, placing in forms, compacting, and curing. It is important that the constituent materials remain uniformly distributed within the concrete mass during various stages of its handling, and that full compaction is achieved followed by proper curing. When any of these conditions is not satisfied the strength and durability of hardened concrete are adversely affected.
This chapter mainly considers the poor construction practices generally adopted on sites, its adverse effects on concrete produced, and possible guidelines for controlling the same.
A wide variety of poor construction practices, resulting from bad workmanship and inadequate quality control and supervision, such as use of excess water content, segregation/inadequate placing, poor compaction/consolidation, inadequate cover to reinforcement, incorrect placement of steel, poor curing, inadequate formwork, incorrect placement of construction joints, and inadequate mixing, are discussed in this chapter.