Dig the hole to three times the diameter of the post. Concrete is a mixture of sand, gravel, Portland cement and water. Loss of abrasive resistance 4. Depending on the product, it may set … Add water 4. Sandy and/or fast draining soils may require a plastic lining to prevent seepage of water … Factors That Affect Concrete Setting . If there is too much water, the chemical reaction (hydration) that "cures" the cement in the concrete is adversely affected if there is too much (or too little water) in the mix, leading to weaker concrete than if the optimum amount of water … This means that water plays a crucial role in the production of concrete – the strength of the concrete is dependent on the water to cement ratio. In hot conditions where concrete sets quickly you should try and cool the area down and begin the curing process immediately after the concrete is laid. Hydration process is slow, taking concrete a full 28 days to reach it's full strength potential. And if you mix too much (for the hole you have dug) then you have to throw some away, and if you mix not enough then you have to mix more. This method is known as dusting. It is also conveniently packed to ensure the correct amount of concrete for the right application. Rise in permeability 5. I got a bag of that ready mixed 'postcrete' - it said 'dig a hole, half fill with water then pour the mix in'. Plus, here are 10 ways you probably didn’t know you could use concrete. (more on the water/cement ratio in the next lesson) Water reducing additives typically allow 5%-10% less water to be used in the mix, which results in an even stronger concrete. I think I put too much water in the concrete :-(Thread starter a; Start date Aug 18, 2003; A. a. Aug 18, 2003 #1 shouldnt have been too tricky a job to concrete in a post for a washing line! Step 10. If you want to guarantee the best quality in terms of frost-resistance, compressive strength and longevity – then you should go with the benefits afforded by readymix concrete delivery. Hot ambient temperatures and wind accelerate the evaporation of moisture–speeding concrete setting … Drying shrinkage 3. Often, your expert ready mix supplier has adjusted the amount of water fractionally to meet your intended use, as well as other factors such as the weather conditions or time of year. Put in post 3. This water is added to make the concrete easier to install. You can also buy additives to accelerate the set. It is also used in rainy & cold weather conditions. ­Depending on the amount you use, quick-drying Quikrete concrete can set in as little as 10 minutes, although the common time for larger projects is between 20 and 40 minutes [source: Pavement Package]. Moisten the hole with a garden hose, if it's not raining. Joined: 10 Oct 2013 Messages: 6 Thanks Received: 0 Location: Sussex Country: will that not mean it just sticks to the bag and not the dirt surround brickdust, 19 Apr 2015 #3. With this said. When there is too much water in the concrete, there is greater shrinkage with the possibility for more cracks and reduced compressive strength. To make sure you have the right amount of water, make ridges in the mixed concrete. The concrete simply mixes with clean water, and sets in 30 minutes. For that purpose, you can’t have too much water. Depending on soil conditions, this will require about 1 gallon (3.8 L) of water per 50 lb (22.7 kg) bag. Water is mixed with cement to form a paste, which then binds together with aggregates. Too much water can result in shrinkage and reduce the strength of the concrete. 4. Effects of too much water in concrete. Mix each addition in thoroughly before adding more. Mixing concrete is a technical job that requires knowledge, practice and skill to get right. Ever Readymix Concrete Ltd is a registered company in England. Tour Start here for a quick overview of the site ... "When there is too much water in the concrete, there is greater shrinkage with the possibility for more cracks and reduced compressive strength. or you could put a poly bag in the hole first, add water, then concrete dry mix. If you need to make concrete mixture more workable then it is preferable to use chemical additives rather than adding too much water. It also allows the concrete mix to become more fluid, and when that happens the aggregate (rock) that is in concrete starts to easily sink lower and lower in the slab or wall. When cement hydrates it sucks up water and grows crystals around the aggregate particles. calcium is also for cold weather concrete applications where a fast initial set is critical to ensure the concrete gets hard before it is exposed to freezing temperatures. bag of pre-mx. If you use hot water and keep the dry product in a heated area of your house or garage until you are ready to use it this will greatly accelerate the set of the concrete. A video showed how to use Quikrete fast setting concrete and water. This month, we’re looking at why adding too much water to a mix is a bad idea, and why you should consider having a reliable batch of ready mix delivered instead of mixing concrete yourself. If it contains calcium chloride and your concrete will contain rebar or metal wire mesh, the chlorides will attack it and produce rust. Ever Readymix supply concrete for commercial and domestic customers in Yorkshire, including Barnsley, Doncaster, Goole and Scunthorpe. As concrete hardens and dries it shrinks. The cement (and cementitious materials like fly ash) in the concrete needs water to hydrate and form calcium-silicate-hydrate (C-S-H) which is the crystalline glue that holds the concrete together. 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