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HOW DO YOU USE CORE FILLED BLOCK WORK

Though concrete has been used in construction for a long time, concrete blocks are a comparatively new innovation.

The first concrete block was made in the 1830's.

In 1900 due to the technological advances in the manufacture of cement; plus the invention of a concrete block making machine, led to its widespread manufacture and use.

The Advantage Of Concrete Block Work Is That It Can Be Laid In
The Traditional Masonry Style, Using Layers Of Blocks.

Blocks can vary in size, but they are usually larger than the traditional bricks.

The center of the block can have up to four cores, but most blocks have two cores.

The core is typically tapered so that the top surface has a greater area which allows a larger area for the mortar bed.

Concrete blocks come in a variety of sizes, designs, textures, specialized shapes and decorative profiles.

Concrete blocks are available in many colors and textures.

These colored and textured blocks have aesthetic looks, which makes it ideal to use in external walls.

There are specialized blocks such as U-shaped blocks, jamb blocks, grooved blocks, and bullnoses etc, which are used for special applications.

Unlike brickwork, a concrete block can be reinforced by using steel bars in the core and grouting it. The grouting bonds the steel reinforcement to the concrete block.

The reinforcing imparts a greater tensile strength to the wall, which can withstand higher lateral forces due
to wind and seismic activity.

A wall, which is constructed with reinforcing bars spaced 800mm center or less and fully grouted, is considered to be reinforced masonry and is referred to as such.

They have similar characteristics as a concrete wall built in-situ.

The spacing of the reinforcing bars and the grouting mixture are of critical importance to achieve the
desired strength.

A reinforced wall is an important structural element and it should only be designed by a structural engineer.

GROUT SPECIFICATIONS:

The correct grout specification must be used in order to achieve the desired structural strength.

Since a reinforced wall is a load bearing member, this aspect is very important.

Grout Used For This Purpose Should Have The Following Characteristics:

* Compressive strength of > 20MPa.

* Cement in the grout mixture should not be < 300 kg/cu.m.

* If round aggregate is being used, it should be < 10mm.

* Sand should be cleaned so that it does not contain any salts.

* Pouring consistency of grout should be such that the core is fully filled and surrounds the reinforcement completely.

The consistency of the grout should be such that its constituents should not get separated.

GROUTING PROCESS:

For small jobs, the grout can be mixed in-situ and then poured using buckets into the hoppers placed on
top of the wall.

For larger projects, using a transit mixer to deliver grout is more economical and convenient. A hose and nozzle is used to pour the grout into the core.

Before pouring the grout, the core is cleaned of mortar dags that are sticking inside. This can be done by
using a steel rod.

This debris, which falls to the bottom, can be cleared from the bottom of the core, through the 'clean out' space that is provided.

The vertical reinforcement bars are tied to the starter bars and form work is placed to cover the clean out space.

If the weather is exceedingly hot, to prevent 'flash setting', it may be necessary to cool the blocks by hosing
the cores.

If this is being done, the hosing should be completed at least half an hour before the grout is poured.

Since high pressure is developed at the core bottom, grouting lifts of greater than 1.2 meters should be
done in two stages, at least 30 minutes apart.

Depending On The Type Of Concrete Blockwork Being Used, The Number Of Pours May Have To Be Increased Appropriately For Greater Grouting Lifts

Any grout spills must be cleaned before the grout sets.

Concrete blocks have become indispensable to the construction industry.

They are easy to use because of their core, and can be reinforced at the same time with steel bars.

The concrete block can be turned into a concrete wall by using reinforcement.

Therefore, without any increase in thickness, the strength of the wall can be increased, to make it load
bearing.

This saves space as well as reduces costs.

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