A ‘Dirty Secret’ of the Construction Industry is; adding of extra water to concrete mixes.
The ready mix concrete suppliers carefully design mixes with appropriate water cement ratios, which are loaded onto the delivery truck by computer controlled batching systems. . . . . . . All this effort on getting the mix right goes [read more...]
You might have heard of Liquid Limestone as an alternative paving material…….But what is it?
Really its just a different type of concrete.
The differences between Concrete and Liquid limestone are:
Instead of standard Portland ‘Grey’ Cement it uses White Cement. It uses crushed limestone rather than other types of rock gravel and sand. [read more...]
The concrete pavement comprises the actual slab and its foundation known as the ‘Subgrade’
A lot of concreters will say a concrete slabs don’t need any foundations……That’s Bulldust!
The area around your new home is likely to have had service trenches dug across it and be churned up by construction activity which is [read more...]
Contraction Joints have been previously described in Pavement Joints 1
The second most common form of Joint is the Expansion, or Isolation Joint.
Although concrete does shrink as it cures, in hot weather it will expand.
Unless an allowance is made for the expansion the concrete paving can push foundations. In long runs of concrete [read more...]
I have previously talked about Concrete Cracking …….but how do you stop random cracking across your driveway concrete?
Well the best way is to control cracking by making sure it cracks where you want it to and the cracks are neat.
To do this you need ‘joints’ which ensure the cracks in the right place.
Some people confuse concrete with cement, but cement is just the ‘glue’ which holds the other constituents of concrete together.
There are a range of different cements but these are the three you will most commonly come across:
General Purpose Cement
This is consistent, versatile and cost effective which makes it a good choice [read more...]
Some people think that concrete is strong enough the day after it is laid……..
Some people think that concrete ‘dries’……..
Both are WRONG!
Hardening is a complex chemical reaction which requires time and moisture. Concrete takes at least a month to reach its final design strength. This time is known as the ‘Curing Period’. [read more...]
Concrete is an artificial stone with four ingredients that all contribute to the overall strength.
Large stones (Aggregate) – The aggregate provides shear strength to the concrete. In other words the concrete has to crack around rather than through the stones. A good aggregate will have a mix of stone sizes rather than just [read more...]