Cement & mixes - Cement, concrete and mortar cement...

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Cement, concrete and mortar cement - lime - sand - aggregate. ballest - mortar - concrete Below are details of concrete and mortar for different applications, how to estimate quantities and what these quantities mean. The various mixes are quoted as volume ratios, however the individual components are normally sold by weight, so a little calculation work is required. Cement in concrete and mortar creates its strength by chemical reaction, it is not like wallpaper glue which 'drys out', it 'goes off'. In fact, if the concrete or mortar should 'dry out' before the chemical reaction is substantially complete, it will fail. Likewise if it is subjected to a frost, it can also fail. Concrete/mortar will take months to reach it's full strength however after about 24 hours it should be fairly hard and after 4 or 5 days, the strength should be enough to stand upto normal punishment. The various components: Cement: For normal 'around the house' types jobs, Ordinary (or Portland) cement is required. This is normally available in 50kg bags, although smaller 25kg bags are increasingly becoming available to take account of the UK manual handling regulations. Try not to buy more cement than you need as it cannot be stored for very long. Some special cements are available (i.e. quick drying) which may be required for special situation. Lime:
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Cement & mixes - Cement, concrete and mortar cement...

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