chemcial and resistance tests (1)

Report No. 93-3981 Date 10/19/93

At the request of the Client, laboratory tests were performed to determine the
chemical resistance of Penetron treated concrete.

Experimental Design
The concrete used for the study had a design strength f"c = 4000 psi. The concrete mix proportions are presented on Attachment 1.

The concrete specimens used were saw-cut from 6 x 12 inch concrete cylinders. The specimens were 2 inches thick and 6 inches in diameter. At the time of the study, the concrete was 28 days old.

The Penetron material (which was received in powder form in a sealed bag) was mixed with water into a slurry. The ratios were:

• 2 parts Penetron
• 0.8 parts water

The slurry was then applied on all surfaces of the concrete specimens by brushing. After the final setting of Penetron the surfaces of the specimens were moistened and placed in a regular concrete curing room for 14 days at 73 OF and 100% relative humidity. At the end of 14 days, the specimens were removed from the curing room and placed in various chemical solutions which provided a wide range of pH levels and corrosive conditions.

Test Results

CONCLUSIONS

Based on these test results, the following conclusions were drawn:
1. The Penetron treated concrete was found to be resistant to acidic and alkaline conditions ranging between pH values of 3 to 11. Also, chloride containing solutions did not have any measurable effect on thePenetron concrete.

2. The untreated concrete (control samples) had surface weathering when exposed to pH of 3, rain water chlorides and sulfate solutions.

KS/smdcc: (1) Client
Doug Quick

ATTACHMENT I

CONCRETE MIX DESIGN USED FOR
THE PENETRON TREATMENT TESTS