Keeping Our New Concrete Wet

After pouring the main floor yesterday, it was good to have some rain today.  Water helps concrete cure slowly and reduces the risk of cracking.

Relaxing After Pouring Concrete

It was a big day yesterday as we poured our Harvest Gold colored concrete over the hollow core concrete panels.  This was a major milestone for our project.  Now, we need to pour the remaining concrete on the lower level (basement) and the garage.  The ground floor is looking great!

Our plan is to complete the next two pours before Thanksgiving.  Although the rain is good, the schedule looks tight.

Saw Cuts to Attract Cracking

Concrete cracks.  This is a fact.  We don’t want our concrete floors to crack.

There are a number of elements that we planned to reduce the risk of cracking, including the concrete mix design, avoiding sharp edges on posts in the concrete, and handling the concrete as it was poured.  However, concrete still cracks.

There are a number of techniques to control cracking and limit the cracking to specific areas.  One of these techniques is to use a saw and cut grooves in the concrete.  The purpose of these saw cuts is not to stop the cracking but to create a weak area that will attract the cracks.

It is best to cut the concrete as soon as possible after a pour, so the cracks can develop and collect in the saw cuts as the concrete cures.  Thus, Bill Brown’s team were on site today to cut the concrete that was poured yesterday.  They used string lines to follow the planned saw cuts from our design.

At this point, the concrete was too soft to cut cleanly so they left the site.

String lines showing where the saw cuts will go to attract cracking.

String lines showing where the saw cuts will go to attract cracking.

The concrete on the corner by the bridge looked nice today.  The silver cap is where an electrical outlet will be in the floor.

The concrete on the corner by the bridge looked nice today. The silver cap is where an electrical outlet will be in the floor.

After Bill Brown's team left, it started raining.  It is good for the concrete to be wet so it will cure slowly (and not crack!).  Note the string lines where the saw cuts will be made.

After Bill Brown's team left, it started to rain. It is good for the concrete to be wet so it will cure slowly (and not crack!). Note the string lines where the saw cuts will be made.

Reed Kingston and his two sons, Cole and Graham, came to the job site to see the new concrete.  They thought it would be better in the sunshine.

Reed Kingston and his two sons, Cole and Graham, came to the job site to see the new concrete. They thought it would be better in the sunshine.

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