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GWC specializes in the following: concrete waterproofing, concrete restoration, corrosion control, concrete protection, concrete preservation, xypex admixture, xypex crystalline waterproofing, blast resistant, structural hardening, impact resistance, crack injection, crack repair, hydroactive grout, swelling sealant, expansion joints, pressure resistant, acid resistant, chemical resistant, freeze resistant, thaw resistant, radiation resistant, environmentally friendly, concrete coatings, concrete membranes, concrete resurfacing, concrete repair, concrete leaks, corroded steel rebar, repair basement leaks, seal basement leaks, parking structure repair, parking structure coatings, parking structure waterproofing, parking structure restoration, foundation leaks, foundation crack repair, foundation waterproofing, foundation coatings, migrating waterproofing

XYPEX Performance Characteristics

PERMEABILITY

U.S. Army Corps of Engineers (USACE) CRD C 48-73 "Permeability of Concrete"
Pacific Testing Labs, Seattle, USA

Two inch thick, 2000 psi Xypex-treated concrete samples were pressure tested up to 405 ft. water head (175 psi), the limit of the testing apparatus. While untreated samples showed marked leakage, the Xypex-treated samples (as a result of the crystallization process) became totally sealed and exhibited no measurable leakage.

DIN 1048 "Water Impermeability of Concrete" Bautest - Corporation for Research & Testing of Building Materials, Augsburg, Germany.

Twenty cm thick Xypex-treated concrete samples were pressure tested up to 7 bars (230 ft. water head) for 24 hours to determine water impermeability. While the reference specimens measured water penetration up to a depth of 92 mm, Xypex-treated samples measured water penetration of zero to an average of 4 mm.

ÖNORN B 3303 "Water Permeability of Concrete" Technologishes Gerwerbemuseum, Federal Higher Technical Education & Research Institute, Vienna, Austria.

Xypex-treated concrete samples were pressure tested to a maximum 7 bars (230 fi water head) for 10 days. Test revealed that while 25 ml of water had penetrated the untreated concrete samples, zero ml had penetrated the Xypex-treated samples. Test specimens were then broken and showed water penetration to a depth of 15 mm on untreated samples but no measurable water penetration on the Xypex-treated samples.

CSN 1209/1321 "Impermeability and Resistance to Pressurized Water" Institute of Civil Engineering, Technology and Testing, Bratislava, Slovak Republic.

Xypex-treated and untreated concrete samples were exposed to 1.2 Mpa (175 ft of water head) of pressure to determine water permeability. Results showed the Xypex-treated samples provided effective protection against hydrostatic waster pressure. Treated and untreated samples were also subjected to contact with silage juices and various petroleum products (e.g. diesel oil, transformer oil, gasoline) at 14 kpa for 28 days. The Xypex-treated samples significantly reduced the penetration of these solutions.

Xypex Material Safety Data Sheet

Bechtel Informational Briefing

CHEMICAL RESISTANCE

IWATE University Technical Report "Resistance to Acid Attack" Japan

Xypex-treated mortar and untreated mortar were measured for acid resistance after exposure to a 5% H2SO4 solution for 100 days. A measurement of the corrosion ratio for the Xypex-treated sample was 0.117, while the untreated sample measured 0.210. Xypex suppressed concrete erosion to 1/8 of the reference samples.

ASTM C 267 - 77 "Compressive Resistance to Mortars" Pacific Testing Labs, Seattle, USA

Xypex-treated cylinders and untreated cylinders were exposed to hydrochloric acid, caustic soda, toluene, mineral oil, ethylene glycol, pool chlorine, brake fluid and other chemicals. Results indicated that chemical exposure did not have any detrimental effects on the Xypex coating. Tests following chemical exposure measured an average 17% higher compressive strength in the Xypex-treated specimens over the untreated samples.

ASTM 672 "Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to De-icing Chemicals." Twin City Testing Lab, St. Paul, USA

Xypex-treated samples restricted chloride ion concentration to below the level necessary to promote electrolytic corrosion of reinforcing steel. Visual examination of untreated panels after 50 freeze/thaw cycles showed a marked increase in surface deterioration compared to Xypex-treated samples.

JIS "Chemical Durability Test" Japanese Utility Company, in-house Test Report, Tokyo, Japan.

Concrete samples containing Xypex Admix were tested against five samples containing other admixtures and against a control sample, to determine resistance to corrosion and deterioration caused by contact with aggressive chemicals. All samples were soaked in a 5% sulfuric acid solution at 20C for six months. Various evaluations and measurements were assessed every month during the test period, including: Photographic comparisons, relative dynamic modulus elasticity, percentage change in length, weight and flexural rigidity. Although the Xypex Admix sample was subjected to acid conditions well outside its published range, the results confirmed Xypex with the best performance among the seven samples tested.

"Sulfuric Acid Resistance Test" Aviles Engineering Corporation, Texas, USA

Concrete samples containing Xypex Admix at different dosage rates (3%, 5% and 7%) were tested against untreated control samples for Sulfuric acid resistance. After immersion in the Sulfuric acid, each sample was tested for weight loss on a daily basis until a weight loss of 50% or a definite response trend was obtained. The percentage weight loss of the samples containing Xypex Admix tested significantly lower than the control samples.

"Sulphate Resistance Test" Taywood Engineering Ltd. Perth, Australia.

Xypex Admix-treated concrete samples were immersed in an ammonium-sulphate solution and tested for "resistance in a harsh environment". The performance of the Xypex-Crystalline-Technology was compared with five other concretes, including one containing a sulphate-resistant cement. Each of the test samples was cured for seven days and then placed in an ammonium-sulphate solution (132 g/l) for 180 days. The rate of corrosion was determined by measuring weight loss, and length change was noted on a weekly basis. The Xypex-Crystalline-Technology substantially improved concrete performance as compared to the reference concrete and tested very similar to the sulphate-resistant concrete. The Xypex Admix-treated samples also provided the highest level of protection as measured by change in length.

FREEZE/THAW DURABILITY

ASTM C 666 "Freeze/Thaw Durability" Independent Lab, Ohio, USA

After 300 freeze/thaw cycles, the Xypex Admix-treated samples indicated 94% durability.

ASTM C 672 "Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to De-icing Chemicals" Twin City Testing Lab, St. Paul, USA

JIS A 6204 "Concrete Freeze/Thaw" Japan Building Material Test Center.

The resonating frequency of both untreated and Xypex-treated concrete samples were measured throughout 435 freeze/thaw cycles. At 204 cycles, the Xypex-treated samples showed 96% relative durability compared to 90% in the untreated samples. At 435 cycles, the Xypex-treated samples measured 91% relative durability compared to 78% in the untreated samples.

COMPRESSIVE STRENGTH

ASTM C 39 "Compressive Strength of Cylindrical Concrete Specimens" HBT Agra, Vancouver, Canada.

Concrete samples containing Xypex Admix at various dosage rates (1%, 2% and 5%) were tested against an untreated concrete control sample. Compressive strength test results after 28 days indicated a significant strength increase in the samples incorporating Xypex Admix. The compressive strength increase varied between 5% and 20% (depending on the Xypex Admix dosage rate) over that of the reference sample.

ASTM C 39 "Compressive Strength of Cylindrical Concrete Specimens" Kleinfelder Labs, San Francisco, California, USA

After 28 days, the compressive strength test of the concrete containing Xypex Admix measured 7160 psi as compared to the reference sample at 6460 psi (a 10% increase.)

RADIATION RESISTANCE

USA Standard No. N69 "Protective Coating for the Nuclear Industry" Pacific Testing Labs, Seattle, USA

After exposure to 5.76 x 10-4 rads of gamma radiation, the Xypex treatment revealed no ill effects or damages.

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