DATE: 12 FEBRUARY 2026 TSR# 26-02-06-01

Palafox Transfer Station Pensacola, FL

INTRODUCTION

This report covers the results of microscopical examinations of six, 3-5/8-inches diameter core samples of hardened concrete submitted to the Petrographic Laboratory for pre-job evaluations to determine the depths to sound concrete prior to reported repairs. The samples were marked “Palafox transfer station 2906 Palafox Blvd Bay 2 Point 5 17 Jan 26”, “Palafox transfer station 2906 Palafox Blvd Bay 3 Point 4 17 Jan 26”, “Palafox transfer station 2906 Palafox Blvd Bay 4 Point 2 17 Jan 26”, “Palafox transfer station 2906 Palafox Blvd Bay 1 Point 6 17 Jan 26”, “Palafox transfer station 2906 Palafox Blvd Bay 3 Point 3 17 Jan 26”, and “Palafox transfer station 2906 Palafox Blvd Bay 4 Point 1 17 Jan 26”, on the respective side surfaces and will be referred to as “Bay 2 Point 5”, Bay 3 Point 4”, “Bay 4 Point 2”, “Bay 1 Point 6”, “Bay 3 Point 3”, and “Bay 4 Point 1”, respectively. The samples measured approximately 10-1/2-inches, 8-3/4-inches, 11-1/2-inches, 12-1/2-inches, 10-1/2-inches, and 6-inches in length, respectively. The submitted samples, as received, are shown in Plates 1-6.

It was reported that the samples represent a tipping floor that may be topped with The Euclid Chemical Co.’s EucoFloor 404. The depth(s) to sound concrete was requested prior to reported repairs.

METHODS

For the present work, the samples were photographed and measured. The cores were cut in half using a diamond-edged saw. The cut surfaces were oriented perpendicular to the top and bottom surfaces of the respective sample. One half of each saw-cut slab surface was prepared for examination by lapping, using progressively finer abrasives with water, according to our standard procedure. The resulting prepared surfaces were satisfactory for accurate air-void content determinations.

The air-void contents were determined using the point count method described in ASTM C 457 “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete”, at a magnification of 100 diameters.

The prepared surfaces and sample trimmings were examined following the guidelines in accordance with the methods described in ASTM C 856 “Standard Practice for Petrographic Examination of Hardened Concrete”.

RESULTS OF MICROSCOPICAL EXAMINATION

GENERAL CONDITION

The submitted core samples exhibited similar top, exposed surfaces that were composed of exposed aggregates, fractured paste/mortars, and discontinuous coatings of yellow paint. All samples also exhibited varying amounts of debris and fibrous matted materials, Plates 9 and 10. In sample “Bay 1 Point 6”, debris was observed up to an approximately 3/16-inch depth.

In section, the upper portion of sample “Bay 3 Point 4” exhibited a discontinuous zone of lower pH paste from zero (non-existent) up to approximately 1/32-inch thick, Plate 9. All other samples exhibited discontinuous zones of lower pH ranging from zero (non-existent) up to thin veneers.

AIR-VOID CONTENTS

Sample “Bay 2 Point 5”: The microscopically determined, volumetric air-void content was 3.07% based on 2,052 points counted and a traverse length of 102.15-inches.

Sample “Bay 3 Point 4”: The microscopically determined, volumetric air-void content was 2.71% based on 2,030 points counted and a traverse length of 101.00-inches.

Sample “Bay 4 Point 2”: The microscopically determined, volumetric air-void content was 2.71% based on 1,957 points counted and a traverse length of 97.50-inches.

Sample “Bay 1 Point 6”: The microscopically determined, volumetric air-void content was 2.62% based on 2,032 points counted and a traverse length of 100.70-inches.

Sample “Bay 3 Point 3”: The microscopically determined, volumetric air-void content was 3.36% based on 2,175 points counted and a traverse length of 108.30-inches.

Sample “Bay 4 Point 1”: The microscopically determined, volumetric air-void content was 2.28% based on 2,062 points counted and a traverse length of 102.2-inches.

DISCUSSION-CONCLUSION

Six core samples of hardened concrete were submitted to the Petrographic Laboratory for pre-job evaluations to determine the depths to sound concrete prior to reported repairs.

In section, the upper portions of the base concretes exhibited discontinuous zones of lower pH carbonated pastes up to approximately 1/32-inch thick in sample ““Bay 3 Point 4”. The lower pH paste portions are likely from exposures to acidic solutions/silage from garbage and rubbish.

According to The Euclid Chemical Co.’s Eucofloor 404 TDS: “Surface Preparation: Concrete surfaces must be structurally sound, free of loose or deteriorated concrete, and free of dust, dirt, paint, efflorescence, oil, and all other contaminants. Mechanically abrade (a heavy shotblast is strongly suggested) the surface to obtain a surface profile of 1/8 in. (3.2 mm) or equal to CSP 5 or higher in accordance with ICRI Guideline

310.2. Properly clean the profiled area. If the concrete is questionable (weak, punky, heavily contaminated, etc.), it is suggested that cores be taken and analyzed by a qualified petrographer for suggestions on proper surface preparation prior to the topping being placed.”

Based on this examination, the total recommended minimum depth of removal is 1/4-inch. Proper surface preparation yielding a rough profile of CSP 7 is recommended to ensure that the Eucofloor 404 material attains an adequate mechanical bond with the concrete substrate. The prepared surface must be free of loose and unsound concrete, oil, grease, debris and dust, and all bond inhibiting materials. Care should be given not to leave a bruised layer of base/existing concrete at the bonding surface.

This concludes work on these samples by this laboratory.

Jeffrey R. Varga Petrographic Laboratory Supervisor

CC: J. Nowosad J. Brache C. French J. Ohler J. Langham

FILE: TSR# 26-02-06-01

The Euclid Chemical Company is not an independent, third-party laboratory. Testing results may be confidential and are intended solely for the use of the intended recipient(s).

Plate 1 Samples, as received, Container #1, side surfaces

Plate 2 Samples, as received, Container #2, side surfaces

Plate 3 Samples, Container #1, side surfaces

Plate 4 Samples, Container #2, side surfaces

Plate 5 Samples, Container #1, top surfaces

Plate 6 Samples, Container #2, top surfaces

Plate 7 Samples, Container #1, prepared surfaces

Plate 8 Samples, Container #2, prepared surfaces

Plate 9 Plate 10 Container #1, sample “Bay 3 Point 4” Container #2, sample “Bay 1 Point 6”

Plates 9 and 10 Sample trimmings, freshly cut surfaces showing lower pH paste as indicated by phenolphthalein pH indicator solution Note: debris incorporated into exposed surfaces (blue arrows)