Page 38 - Masonry and Concrete

Source: Masonry and Concrete

3
CHAPTER

Concrete Construction

Techniques

oncrete construction consists essentially of six stages—excavating,
Cformwork, reinforcement, pouring, finishing, and curing. Work
begins with material estimating, site preparation, and layout.

3.1 Estimating Materials

Small batches of concrete can be mixed at the job site, but for quan-
tities of one cubic yard or more, it is usually more convenient to
order ready-mix concrete delivered to the site. Ready-mix concrete is
sold by the cubic yard, and most suppliers require a minimum order
of one yard. The cost of ready-mix varies with the distance it must be
hauled for delivery, the size of the order, unloading time, and type of
mix. The construction drawings will give you the shape and dimen-
sions needed for various concrete elements such as a slabs-on-grade,
basement walls, footings, driveways, sidewalks, and so on. If small
quantities of concrete are ordered from a ready-mix supplier, it will
only be necessary to calculate the total quantity of concrete needed.
If concrete is being mixed on site, it will also be necessary to calcu-
late the quantity of each ingredient needed to produce the required
volume of concrete.

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