Concrete mix for max bonding and strength.

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Old 11-22-05, 02:38 PM
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Concrete mix for max bonding and strength.

Steps off porch have settled causing cracking where steps meet proch. After reinforcing the substrate below steps, what mix of cement is strongest and best binding for the replacement pavers? Does adding more cement than sand increase stength? Thanks from a novice.
 
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Old 11-22-05, 06:05 PM
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Concrete mix for max bonding and strength.

I can't quite figure out what you are doing.

1. What is the substrate below the steps and how is it reinforced?

2. What are the replcement pavers?

Adding cement does increase the compressive strength, but it does little to the tensile or bond strength. Adding cement increases the shrinkage and possible shrinkage cracking.

All the compressive strength will not necessarily make things stick together better. Did you fix the cause of the settlement? If not, it will hapen again and you will have cracks no matter what strength the concrete is.

Dick
 
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Old 11-23-05, 08:14 AM
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no what we do is have the driver add more fiber to mixs makes it stronger
 
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Old 11-23-05, 12:47 PM
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Sunstrate is a concrete slab. The slab has tilted slightly to one side causing the cement around the pavers to crack. Will try to level the slab with concrete, and then lay down new pavers. What fiber is added to cement? Thanks.
 
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Old 11-23-05, 04:14 PM
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Concrete mix for max bonding and strength.

If the slab settled, you can probably can expect some more in the future. Leveling it out may be a temporary solution. It takes very little settlement to break the bond between two different pieces of concrete. If you are using concrete pavers, they are normally not set in or on concrete. Clay pavers are.

The fibers that are added to concrete can be fiberglass (alkalai resistant only), polyester, stel and a few others. They are added at the concrete plant. It is not a DIY thing. The fibers can reduce the compressive strength of the concrete, but do increase the tensile strength. They are added to reduce shrinkage cracks.

Dick
 
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