Extensive cracks on almost the entire slab of a Residence at a rural town in Texas prompted an investigation of the cause(s) of the problem. Our evaluation showed that causes of the problem include weak/friable aggregates, re-tempering of the concrete, presence of elevated amount of fly ash, and furthermore, the concrete was over-sanded.

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Some of cracks noted on slab

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Evidence of re-tempering

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Weak and porous coarse aggregates