Examination of Concrete Cores from Lowe's Store in Bowling Green, Kentucky

摘要

The Kentucky Transportation Center was requested by Mr. Tom Brock, Vice Presidentof McWhorter and Company, Inc., to examine cores obtained from a PCC floor slab of a Lowe's store in Bowling Green, Kentucky. From a telephone conversation with Mr. Brock, is was our understanding that a large portion of the surface of the floor slab was scaling and becoming detached. This apparently involved approximately the top 1/8 inch of the slab. Each core was photographed and the dimensions and weight were recorded. After Scanning electron microscopy (SEM)'s and reviewing the micrographs, the authors are of the opinion that the slab surface may have hydrated and sealed itself before the bleed water had time to reach the surface. The mechanism by which this may have occurred was not revealed by the tests and examination that were performed.