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Farm Building and Infrastructure
Buildings & Infrastructure
Concrete Foundation Shuttering
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<blockquote data-quote="Stock" data-source="post: 3653112" data-attributes="member: 61436"><p>Slump test is all about water. More water the higher the slump. Concrete mix is designed so much water to cement to sand and aggregate.</p><p>So if one wants a 25n mix it comes with the required amount of water, if you add water you weaken the mix.</p><p>A high slump also means a very fluid and easily worked concrete. HOWEVER if an admixture is added then the slump test is useless and different test is carried out. </p><p></p><p>For shutters one looks for a low slump and if one is pouring a large volume of concrete in to a shutter is is controlled to prevent overloading the design of the shutter and to prevent overheating of the concrete (weakening the wall). Once concrete is mixed the chemical reaction begins and continues for the life of the concrete. After a period of time the mix starts to support itself again reducing the load on the shutter.</p><p>Again one needs to be careful with the type of cement used in the mix, CEMII cures normally but cement containing GGBS cures slowly requiring the shutters to remain insitu longer and is fine for composite floors but not for every floor.</p><p></p><p>So make sure you know what you are getting in the truck...........................................</p></blockquote><p></p>
[QUOTE="Stock, post: 3653112, member: 61436"] Slump test is all about water. More water the higher the slump. Concrete mix is designed so much water to cement to sand and aggregate. So if one wants a 25n mix it comes with the required amount of water, if you add water you weaken the mix. A high slump also means a very fluid and easily worked concrete. HOWEVER if an admixture is added then the slump test is useless and different test is carried out. For shutters one looks for a low slump and if one is pouring a large volume of concrete in to a shutter is is controlled to prevent overloading the design of the shutter and to prevent overheating of the concrete (weakening the wall). Once concrete is mixed the chemical reaction begins and continues for the life of the concrete. After a period of time the mix starts to support itself again reducing the load on the shutter. Again one needs to be careful with the type of cement used in the mix, CEMII cures normally but cement containing GGBS cures slowly requiring the shutters to remain insitu longer and is fine for composite floors but not for every floor. So make sure you know what you are getting in the truck........................................... [/QUOTE]
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