Floor Coating Failure

Both core samples (side view) from the failed floor had near-surface parallel cracks.

The layers of the floor system with arrows pointing to the white areas (silica gels) on the surface of the concrete.

The surface of the lab sample shows lithium silicate applied to the sand-blasted concrete surface.

This cross section, left, of the lab sample shows lithium silicate along the sand-blasted concrete surface. Note the gel in the depressions created by sand blasting. This thin-section photomicrograph shows lithium silicate gel on the undulating, sand-blasted concrete surface.

This cross section, left, of the lab sample shows lithium silicate along the sand-blasted concrete surface. Note the gel in the depressions created by sand blasting. This thin-section photomicrograph shows lithium silicate gel on the undulating, sand-blasted concrete surface.

At the top are scanning electron microscope images of a cross-section of the laboratory sample. At the bottom is the electron dispersive spectroscopy spectrum showing the elemental composition of the lithium silicate gel along the surface.

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