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Where can you find in ACI code the effect of cold joints in concrete?
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Why do concrete patios crack?
A concrete patio usually cracks due to heat cold. If it is to cold it contract and break. If it is to hot it will expand and break. Then water can seep into those cracks and freeze causing the crack to expand
My concrete was poured when it was cold and it looks crackled on the surface so will it eventually fail or can it be fixed and how?
Go down to the shops and buy around 40 tubs of moisturiser and smother on concrete. This should make the concrete feel nice and get rid of all wrinkles.
Is concrete driveway appropriate for a cold climate?
Absolutely. Most people in cold climates are concerned about the effects of salt, even road salts that are transferred to the driveway. There are some very simple things you can do to protect yourself and they all begin with planning and construction. See the link below to for an article on protecting concrete from the effects of salt.
What is the setting and hardening of cement?
Setting of cement is the initial solidifying of the cement. I presume you will not be using a cement material by itself, but by mixing in aggregates and fines to create 'concrete' I will continue this answer talking about concrete but much still applied to a simple cement mortar also. Depending on temperature (warm fast, cold slow) initial set will be between 2 and 24 hours. This will result in a concrete material that can easily be marked with a fingernail. Once the concrete has set, the concrete goes through a process called curing or 'hardening' where the pozzolanic constituents of the concrete 'hydrate' (react with the water) to create a hard material. This will continue for the life of the concrete but the most significant strength gains will be noticed within the first 28 days and this is the strength normally taken as the design strength of the concrete. It can be expected in ideal conditions with warm air and a light breeze in the air, for the concrete to achieve 30% of it's 28 day strength in 1 day 60-80% in 3 days 80-100% in 7 days and 100-% in 28 days Many factors will affect this. temperature will have a large impact. additives such as retarders and accelerators can be added to slow and speed up the hardening process respectively.
How long does it take concrete to dry?
If you are doing something like fence post, figure around 24hrs to be able to work with it. If its something like a flat surface (walkway etc..) figure 2 days before you can walk on it.
Why retarders added to concrete when using slip form of highly construced structures?
To eliminate the posibility of cold joints.
How do expansion joints in a sidewalk keep the concrete from cracking?
The expansion joint in a sidewalk keeps the concrete from cracking just as what its called. It allows the concrete to expand when heated and contract when cold. Without the joint, the concrete will crack and become uneven or mountain up.
What is the control joints?
Control joints (often confused with expansion joints) are cut into the concrete or asphalt, and are different from expansion joints as shown in the photo. The joints are cut into the structure at regular intervals allow cracking to occur in a controlled fashion. Road control joints can be sealed with hot tar, cold sealant (such as silicone), or compression sealant (such as rubber).
What is the control?
Control joints (often confused with expansion joints) are cut into the concrete or asphalt, and are different from expansion joints as shown in the photo. The joints are cut into the structure at regular intervals allow cracking to occur in a controlled fashion. Road control joints can be sealed with hot tar, cold sealant (such as silicone), or compression sealant (such as rubber).
Does concrete conduct cold?
Yes, concrete has form of "salvatory" element in it's mixture which can conduct heat or cold. Like on a sunny afternoon, the concrete becomes hot; likewise, on a cold night, the concrete becomes cold.
How does a cold front effect your damaged knee joints?
Even though there seems to be anecdotal evidence for it there is no scientificaly measurable conection btween the weather and joint pain.
What has the author C J Korhonen written?
C. J. Korhonen has written: 'Antifreeze admixtures for cold regions concreting' -- subject(s): Concrete, Effect of temperature on, Additives 'Roof blisters' -- subject(s): Roofs, Roofing, Maintenance and repair, Building materials, Defects 'Assessing cryogenic testing of aggregates for concrete pavements' -- subject(s): Concrete, Concrete Pavements, Concrete construction, Effect of temperature on, Frost damage, Pavements, Pavements, Concrete, Testing
What is purpose of bevel in chisel?
to pare timber for housing joints!
How do you mix premix cement to lay over an existing badly laid cement floor in storeroom?
You will need existing floor to be clean and dry. Layering concrete like this is called a cold joint. Concrete does not like cold joints. That I why big jobs like the cn tower and Hoover dam are all one pour basically. If you have to do cold joints, clean base floor, rent a sacrifice tool at a rent shop, rough up the floor as much as possible, clean all dirt and dust again, cover floor with a bonding agent from a box store, pour new concrete. Over 2" is recommended. Another way to get it to hold is to drill holes into base floor or even put various concrete screws in base floor with just the heads sticking up a little bit so new concrete can grab.
What has the author Khossrow Babaei written?
Khossrow Babaei has written: 'Bridge deck program development' -- subject(s): Concrete Bridges, Floors, Maintenance and repair 'Evaluation of half-cell corrosion detection test for concrete bridge decks' -- subject(s): Concrete Bridges, Corrosion, Floors, Reinforced concrete, Reinforcing bars, Structural Steel 'Development of standard specifications for bending/straightening concrete reinforcing steel' -- subject(s): Reinforced concrete, Reinforcing bars, Specifications, Standards 'Evaluation of the performance of cold-mix recycled asphalt concrete pavement in Washington' -- subject(s): Asphalt Pavements, Recycling 'Bending/straightening and grouting concrete reinforcing steel' -- subject(s): Reinforced concrete, Reinforcing bars, Specifications, Standards 'Effectiveness of concrete bridge deck asphalt-membrane protection' -- subject(s): Concrete Bridges, Floors, Maintenance and repair 'Development of durable anchorage systems for bridge expansion joints' -- subject(s): Bridges, Deterioration, Expansion joints, Floors, Joints
Why do your feet feel cold when they are exposed to a concrete floor in winter?
aaah! bcoz it's concrete!
Is the word cold an abstract or concrete word?
The noun cold is a concrete noun; a word for something that can be felt physically and measured with instruments. Example sentence: The cold and the snow were a dim memory as we lay on the beach in Bermuda.
