Slab on Grade Concrete
Slab on Grade Concrete – Floor space – 8,500ft2 for a warehouse, South Texas
Scaling and wavy surface.
c. Visual Observation & Petrographic Analysis
Vertically sawn and polished surface of core. Show insufficient aggregate
(ii) Petrographic Analysis
a & b show porous paste and a high w/c concrete. b shows a bleed channel (arrowed) with fines of cement & sand particles.
Cause of problem is due to insufficient aggregate and high water content used in the
Formulation of concrete.
Figure (c) shows concrete sample with sufficient aggregate – as compared to quantity of aggregate in (a) above.
Figure d shows an evenly set, dense cement paste as opposed to the micro porous paste in the sample of interest above – (b)