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Q: Why should large concrete slabs be laid with expansion joints so that they are not touching?
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Why should large concrete slabs be laid with expansion so that they are not touching?

because large slabs of concrete have expansion joints between them.

Is cracking at joints acceptable after new pour of concrete?

Cracking at expansion joints is always acceptable and is the reason for the joint itself. There are two kinds of cracks, pretty ones and ugly ones! Ugly ones are random cracks where the concrete relieves itself from drying shrinkage in a random location within the slab of concrete which is normally not appealing to the eye. Expansion joints are placed at predetermined intervals within the slab where random cracks are weakened planes in locations where cracking is predicted prior to fresh concrete placement. All concrete shrinks when it dries, the larger the slab, the greater the overall shrinkage. When the tensile strength of drying shrinkage exceeds the tensile strength of the concrete, cracking will occur. Lets just hopes it cracks in a spot where we planned it instead of a location where didn't. By the way, joints should be cut at least 25% of the depth of the slab.

Concerned about the gap between the concrete edge or trim of pool and the rest of the concrete flooring?

I assume the "gap" you refer to is the expansion joint between the coping and the concrete deck. The expansion joint is there to prevent damage from occurring in case of movement. There should be no reason for concern, unless you are replacing the deck.

Can concrete shrink after it is cured?

Once the moisture is out of the concrete and it is cured it should not shrink - it is however in a state of stress so make sure control joints are added to any large concrete areas that are poured and placed.

Why do train tracks buckle?

It's usually the result of expansion and contraction due to temperature changes, but this should be allowed for by suitable expansion joints. The rails may also buckle if the formation on which the track lies, subsides.

When laying concrete block should you use spacers in between each block?

Spacer's will make it easier for the "First Time Mason". It will keep the Joints at the standard 3/8 inch.

Should I be worried about the small cracks in my basement concrete floor or can I seal and paint over them?

Cracks from expansion or settling are fairly common, but sealing them will ensure no seepage of ground water in the future

Method of laying cement concrete road?

6'' thick sand filling, then 9'' thick plain cement concrete 1:4:8 [ ratio] then top layer of Plain cement concrete 1:1.5:3 mixed with concrete mixer. proper vibrator should be used. expansion joint should be after 2.5mts to 3mts alternatively of 12 mm wide and filled with the mixer of hot bitumen sand mixed. by: m.s.chaudhary [civil engineer]

What type of concrete should you use when making a concrete bench?

The best concrete for making a concrete bench is Bench concrete.

How often should ball joints be replaced?

Ball joints should be replaced anywhere between 70,000 to 150,000 miles. Ball joints connect the wheel to the car's suspension system.

Where should be a construction joint provided in slab and beam?

Construction joints should be provided in slabs and beams at locations where it is necessary to stop pouring concrete temporarily and resume later. These joints are typically located at points of minimum shear and bending moment to ensure the structural integrity of the slab or beam. They should be planned keeping in mind the structural design and construction sequence to avoid any stress concentrations or discontinuities. Additionally, joints should be properly sealed and reinforced to ensure durability and prevent any further movement or cracking.

Should frost damage concrete?

which concrete resist frost action