Concrete crumbling
- Thread starter Ralph2
- Start date
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i agree with stuart, the perished, friable surface is conducive with frost spalling.
It was laid in the Autumn last year, not freezing conditions. The surface was tamped. I wouldn't know about the age of the cement, although it was purchased for the job by the builder from a local and fairly busy supplier. I did notice one bag was a different type (plastic not paper) but all Lafarge I think. Is the damage likely to continue getting worse would you think?
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Hmmmm. From what I remember yes, about a day or two after.
it may be that the rain has dragged the cement down from the top area of the concrete, especially if it has been tamped. Effectivley it ends up with a weaker mix through the top part of the mix (im assuming it was mixed on site and not ready mix). That means that it breaks up fairly easily through traffic and the frost action.
I speak from bitter experiance as we did one about 4 months ago. It was the last part of a driveway slab at the bottom of a slope. Mix was exactly the same as the rest of the slab, but the heavy rain travelling over the slab had the same effect on it. Nothing else was wrong with the mix or the cement, as we used some from the same batch in a different position and its rock hard. No frost or low temperatures either. Ill be going back to sort it out for him in the better weather.
I speak from bitter experiance as we did one about 4 months ago. It was the last part of a driveway slab at the bottom of a slope. Mix was exactly the same as the rest of the slab, but the heavy rain travelling over the slab had the same effect on it. Nothing else was wrong with the mix or the cement, as we used some from the same batch in a different position and its rock hard. No frost or low temperatures either. Ill be going back to sort it out for him in the better weather.
Hey Ho. Thanks to everyone for your input!DIYnot Local
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