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cement used in concrete because it gives the strenth to the str
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Why is ready mix concrete required in place of on site mixing of concrete?
That requirement is not true of all jurisdictions. In many areas you can mix onsite if you wish. There may have been lobbying by environmental groups or even cement companies to cause this requirement in your area. The point is why would you mix onsite? Unless you have a very small job or great distance to transport the cement to the job, it is more efficient, cheaper, and cleaner to use ready mix. It is cost effective. Some construction site require site mixing just to save time and money.
When does hydration in concrete start?
As soon as the Cement comes into contact with water. This will start as soon as the cement and aggregates come into contact unless the aggregates have been dried of all surface water.
What grade of concrete will result in a mix of 3 2 1?
Mixing concrete is a basic skill that all DIY enthusiasts should know how to do. Concrete is one of the most common and inexpensive construction materials on the planet being comprised mostly of sand, gravel and cement. Mixing concrete is similar to baking in that to achieve consistent results it is best to follow a specific recipe. There are a multitude of different concrete mixes for different applications depending on the strength, workability and application for the concrete. Mixing concrete is very much a science for professionals, but to the average backyard enthusiast, learning the basics of concrete is enough to get you started. When mixing concrete you will need to mix aggregates such as sand and gravel along with cement powder and water as a catalyst to begin the chemical process of bonding the ingredients together. Mixing concrete is a function of proportions where you will measure the volume of aggregate used to the volume of cement used. The most common concrete mix used worldwide is the 3-2-1 mix which uses three parts gravel, two parts sand and one part cement. Water is added with the idea that you should use as little water as possible to make the concrete workable for what you need it for. Concrete viscosity is measured by "slump" which refers to a specific test where the amount that a cone filed with concrete will lose its shape once the cone is removed is measured in inches or mm. A concrete with zero slump would be very rigid and dry and inclined to hold its shape, where a concrete with a slump of six inches or more would be extremely wet and not inclined to hold a shape. The 3-2-1 mix is so widely used since you can fill large areas with concrete for relatively cheap. You could potentially use only sand and cement, no gravel, to create what is called mortar. In the 3-2-1 mix the gravel serves as a filler taking up a great deal of space while retaining a relatively high overall strength. The disadvantage of the 3-2-1 mix is that the larger gravel aggregate will often float to the surface during finishing, and is unsuitable for thin or detailed concrete applications. The best overall mix for a DIY enthusiast to memorize and use is a simple 3:1 mortar mix. By using three parts sand and one part mortar you can create the strongest concrete possible as well as concrete that is easy to finish and detail with designs, templates or stamps. By not using the gravel the mortar will have a smoother overall consistency, but will ultimately occupy less volume than concrete made using gravel as well. If you are pouring very large volumes of concrete the gravel could prove to be cost effective however for most DIY projects a 3:1 mortar mix is the way to go. The sand that you need to use for a 3:1 mortar mix should be sharp sand, or masonry sand or jointing sand. Each place that you purchase sand will use a different term so it can be confusing when shopping. All that you need to remember is to avoid play sand. Play sand is sand that has been washed and sterilized (this is ok) and then tumbled to soften all the edges of the individual sand grains (this is bad). The sharp edges of the sand help to hold together the concrete mix better than the rounded edges of the tumbled sand. Ideally you would like to find sand from landscape supply stores which will sell to you by the cubic yard. With a strong trailer you can pick up as much sand as you could possibly need for next to nothing - plus the quality of the sand for making cement will be very high. The applications for a DIY enthusiast to use a 3:1 mortar mix are huge. Everything from fixing broken outdoor steps and stairs, driveways, patios, decks, ponds, waterfalls, artificial rock, statues and much more is possible with a simple mix of sand, cement and water. Start with small concrete projects to get a better feel and understanding for how to work with concrete. Since concrete is so popular world wide, and is a highly advanced science, you will never run out of interesting concrete applications to learn about or try. Combined with being the most affordable construction material on the planet and readily available everywhere - learning to mix basic concrete recipes is a fundamental DIY project. Canadian author and second generation swimming pool expert Steve Goodale has an extensive tutorial series and online following for his instructional information on artificial rock and swimming pool construction and repair.
Concrete Foundation Installation?
form_title=Concrete Foundation Installation form_header=7683 Have there been any completed structural drawings for this project?*= () Yes () No Which kind of concrete foundation would you like?*= () Poured concrete slab foundation () Concrete pier foundation () Poured concrete basement () Concrete block foundation () Poured concrete foundation with crawlspace () Want recommendation Please specify what the purpose of the foundation is.*= () Foundation for a new home () Foundation for a mobile home () Existing foundation is beyond repair () Foundation for addition or small structure
What is pour card in civil engineering?
In larger concrete projects with a good quality control program, a pour card is a document that describes the location of the concrete being poured, type/specification of concrete being supplied, a signature block by the inspector and/or engineer indicating that the rebar has been inspected in-place and approved, date of pour, serial number of the concrete truck(s) supplying the concrete, sign-off by the inspector indicating on-site tests for slump and air entrainment (if required) have been completed. Temperature, weather and ticket info from the concrete batch plant/delivery truck are also recorded. The contractor's quality assurance manager will typically keep all the pour cards for a project on file, especially in the even that subsequent testing indicates substandard concrete was installed.
What is the different between ordinary Portland cement and Portland cement?
Ordinary Portland cement is the most common cement used in the world, made from stucco, concrete, mortar and other materials. Slag cement is usually mixed with Portland cement and is the substance leftover after metal has been smelted from raw ore.
What materials were used to build the Roman Colosseum?
The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.The materials used in the construction of the Colosseum were concrete, tufa stone, wood, and marble.
Difference between ordinary Portland cement and puzzalona Portland cement?
OPC - Ordinary Portland cementOPC - Materials used - Argillaceous and calcareous materialsPPC - Portland Pozzolona CementPPC - OPC + Pozzolonoc materials(fly ash, volcanic ash, pumicite at the time of grinding).
What is the most commonly used cement?
The most commonly used cement mixer is the vertical axis mixer. This type of mixer has been a favorite of companies and person purchasers that use colored concrete, small concrete projects, and multiple places where the concrete can be positioned.
What is the most commonly used cement mixer?
The most commonly used cement mixer is the vertical axis mixer. This type of mixer has been a favorite of companies and person purchasers that use colored concrete, small concrete projects, and multiple places where the concrete can be positioned.
Why is ready mix concrete required in place of on site mixing of concrete?
That requirement is not true of all jurisdictions. In many areas you can mix onsite if you wish. There may have been lobbying by environmental groups or even cement companies to cause this requirement in your area. The point is why would you mix onsite? Unless you have a very small job or great distance to transport the cement to the job, it is more efficient, cheaper, and cleaner to use ready mix. It is cost effective. Some construction site require site mixing just to save time and money.
Explain how aggregates are processed for the use as a Portland cement concrete ingredient or as a bituminous concrete ingredient?
There is nothing special about the aggregate, it is simply crushed rock that has been washed.
What was the roofing of the pantheon made of?
The Pantheon has a dome that is made of concrete. The dome of the Pantheon is and always has been the largest unreinforced concrete dome in the world.
When does hydration in concrete start?
As soon as the Cement comes into contact with water. This will start as soon as the cement and aggregates come into contact unless the aggregates have been dried of all surface water.
How water cement ratio and workability is related to compaction factor?
If you are talking about shrinkage, then quite a bit. To make concrete, cement and water react together. There is a specific amount of water required to hydrate the concrete. Any water extra must leave the concrete and while it makes the concrete more workable, hurts the concrete is several ways. The volume of the concrete will change by whatever excess water you have added. To get workability, it's always best to use a water reducing admixture.
What materials have been used for a bus shelter?
The main materials used to make a bus shelter are metal, glass (FOR THE SCREENS) and concrete.
Can white cement be used for filling cracks in cement wals etc?
I've never heard the term 'white cement', but there are many good cement crack fillers available. I have used 'Stone Mason Liquid Crack Filler' and DAP Liquid Cement Crack Filler and been satisfied with both. You should look in the cement and concrete aisle in Home Depot. -
