Do concrete driveways need expansion joints?

Every concrete slab, inside (basements, garages, etc.) or outside (driveways, patios, entries, etc.) are required to have joints every eight feet horizontally and vertically. Expansion Joints provide space between concrete slabs as a buffer for expansion on hot days and contraction when it is cold.

What are concrete water bars?

Waterstops or waterbars are flexible tape like elements of a concrete structure that prevent the passage of water through concrete joints. Concrete joints are most liable to seepage. They are hydrophilic or impervious strips cast into the concrete at the joints to prevent the passage of water. …

How do you install a water bar?

Install waterbars as follows:

  1. Dig the trench. First, dig a trench for the wood that is a 30° angle across the path. Be sure the trench and the waterbar extends off both sides of the path.
  2. Install the log or timber. Place the log or timber in the trench.
  3. Backfill around the waterbar.

Is code for PVC water stopper?


What is the difference between expansion and construction joint?

A construction joint occurs when there are multiple concrete placements. An expansion joint is used in concrete and steel. It can occur between different days of concrete placements. An expansion joint allows the concrete or steel to expand or contract with daily temperature variations.

How long do hypertufa pots last?

20 years

How can Cracks in concrete be avoided?


  1. Start with a sound subgrade. Make sure the subgrade is compacted.
  2. Modify the concrete mix. Use a low water-to-cement ratio.
  3. Install joints. Be active in deciding where control joints will be placed.
  4. Properly cure the concrete. Properly curing concrete slabs: Why and how to cure.

What is the purpose of a construction joint?

Joints allow one concrete element to move independently of other parts of the building or structure. Joints also let concrete shrink as it dries—preventing what’s called internal restraint. Internal restraint is created when one part of a slab shrinks more than another, or shrinks in a different direction.

What is a construction joint in concrete?

Construction joints – are surfaces where two successive placements of concrete meet. They are typically placed at the end of a day’s work but may be required when concrete placement is stopped for longer than the initial setting time of concrete. In slabs they may be designed to permit movement and/or to transfer load.

What does a water bar do?

A water bar or interceptor dyke is a road construction feature that is used to prevent erosion on sloping roads, cleared paths through woodland (for utility companies such as electricity pylons), or other accessways by reducing flow length. The drain way carries the water that would otherwise be carried by the road.

Are concrete expansion joints necessary?

Expansion joints are virtually never needed with interior slabs, because the concrete doesn’t expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

Is code for expansion joints in buildings?

As per IS- 456:2000, structures exceeding 45m in length are designed with one or more expansion joint. As per IS 3414 which is a specific code for joints, it is mentioned as 30m. Expansion joint shall be so provided that the necessary movement occurs with a minimum resistant at joint.

What is the difference between an isolation joint and a construction joint?

An isolation joint is a separation between adjacent sections of a concrete structure to allow relative movement in three directions and through which all of the bonded reinforcement is interrupted. A construction joint is the interface between concrete placements intentionally created to facilitate construction.

Why are my cement pots cracking?

The first and most common reason your concrete planter pot cracked is because the mix contained too much water. The more water that is in the mix, the better the chance that as it evaporates, the concrete will shrink. Concrete by nature will shrink, but the extra water can cause it to shrink too much or quickly.

Is 11817 a construction joint?

IS:11817-1986 : ISO:7727-1984. Indian standard classification of joints in buildings for accommodation of dimensional deviations during construction : joints in building : principles for jointing of building components : accommodation of dimensional deviations during construction.

Can you pour new concrete over old cracked concrete?

There are situations when pouring new concrete isn’t the most suitable option. For instance, surfaces with larger cracks, heaving or settling conditions, or where height cannot be raised, replacement is a better solution. However, in most cases, you can pour a new layer of concrete onto the existing one.

How do you use a water stopper?

Water Stoppers can be join on site with a simple electrical heater blade. Water Bars of same width & design should be sharply levelled at edges using a knife. Turn on the Electric Heater Blade and wait will it become hot. Place the waterstops on both sides of heater blade & press it until it melts but without burning.

What is hydrophilic waterstop?

Hydrophilic waterstops are elements of a concrete structure, intended to prevent moisture infiltration. Hydrophilic means “water-loving”, so these hydrophilic waterstops swell in the presence of moisture. They can be used to seal concrete joints, but also to seal formwork spacers or tie rods.

What is a waterstop and why is it used?

As the name suggests, a waterstop acts to stop water. It is typically a centrally placed seal between joints within concrete to prevent water from passing through the joints. Depending on the type of joint, different types of waterstops may need to be used such as PVC and swellable.

What is PVC waterstop?

The PVC waterstop is extruded form an elastomeric plastic material including high grade polyvinyl chloride, special resin and some chemical additives such as plasticizers and stabilizers. The high material makes PVC waterstops unsurpassed with a variety of features and benefits as shown follow.

What is a waterstop in construction?

A waterstop is a material embedded in the concrete, with the singular purpose to obstruct the passage of water through the joint. In other words, it is not an elastomeric sealant adhered to the exposed surface of a joint.

What is expansion gap?

An expansion gap is a term used when fitting wooden flooring. It is an essential gap that must be left around the edge of the room when fitting hardwood, bamboo or laminate flooring.

Which cement is best for making pots?

QUIKRETE® Concrete Mix (No. 1101) is the original 4000 psi average compressive strength blend of Portland cement, sand, and gravel or stone. Just add water. Use for any general concrete work.

What is a water stop in a shower?

A waterstop (angle) at a doorway provides the wet area outside of a shower enclosure with what is called a “maximum retained water level”. This is defined as: the point at which surface water will start to overflow out of the shower area, or in this instance the room itself.