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Reduced heat of hydration. Replacing cement with the same amount of fly ash can reduce the heat of hydration of concrete. This reduction in the heat of hydration does not sacrifice long-term strength gain or durability. The reduced heat of hydration lessens heat rise problems in mass concrete placements

Improved workability. The spherical shaped particles of fly ash act as miniature ball bearings within the con-crete mix, thus providing a lubricant effect. This same effect also improves concrete pumpability by reducing fric-tional losses during the pumping proc-ess and flat work finishability

Decreased water demand. The re-placement of cement by fly ash re-duces the water demand for a given slump. When fly ash is used, water demand is reduced. Higher fly ash contents will yield higher water reduc-tions. It is important to maintain the water reduction in concrete. Otherwise the decreased water demand may have little or no effect on drying shrink-age/cracking.

Improved resistance to sulfate at-tack. Fly ash improves sulfate resis-tance due to the following:

Reduced permeability reduces sul-fate penetration into the concrete.
Replacement of cement reduces the availability of reactive aluminates.
Reduction in water usage has been shown to improve sulfate resistance.

5. Installation
To achieve the superior handling and finishing characteristics of MRT^® Fly Ash in concrete, the following instructions should be used:

PREPARATION
The material below the area to be filled with concrete must be stable following the ACI Manual of Concrete Practice. Steel placement must comply with ACI 345R and have at least 2 Inches of concrete above the steel. All surfaces that will receive MRT Fly Ash mix shall be clean and free of foreign matter (loose debris, oils, grease, paints, seal-ers, etc.). The application surface must be saturated with water prior to receiv-ing the concrete. Do not leave water standing in the area to be filled with concrete.

MIXING
Follow the applicable section of the appropriate ACI Recommended prac-tice for the correct mixing procedure for your particular application. Con-tact your MRT Representative for specific recommendations. If mix pro-portioning is desired, The MRT Tech-nology Center will assist in determina-tion of proportions.

CURING
Immediately after finishing flat sur-faces, spray the concrete with curing compound until the entire surface is covered. Use a membrane curing compound meeting ASTM C 309. Do not use plastic sheeting for curing.

LIMITATION
1) Engineering requirements and envi-ronmental conditions must be consid-ered to assure proper performance of the product. In hot or cold weather, the setting time will be decreased or increased respectively. Trial batches should be made to determine the ex-act setting time for the conditions pre-sent. If environmental conditions are below 40ºF (4ºC) or expected to drop below 32ºF (0ºC) within 2 hours of placement, one should observe cold weather precautions as recommended by the American Concrete Institute. If environmental conditions are above 85ºF (29ºC) during mixing and plac-ing, cool water should be used to lengthen the set time, observing hot weather precautions as ACI recom-mended.
2) As with all cementitious and poz-zolanic products, MRT Fly Ash is pro-duced from manufactured and natu-rally occurring minerals, and varia-tions in color may occur. Variations in water used, mixing, and curing will affect color and performance. Sam-ples of the mixture must be tested for color conformity prior to use on a pro-ject.
3) Allowance must be made for aggre-gate moisture when determining water content.
4) In accordance with ASTM C 618 fly ash in storage more than six months may be re-tested if requested by the purchaser.

SAFETY
MRT Fly Ash vcan cause injury to eyes and skin. Avoid eye contact or pro-longed contact with the skin. MRT recommends using tight fitting gog-gles, rubber gloves, and protective clothing to cover arms and legs ade-quately. In case of eye contact, flush with clean water for a minimum of fifteen (15) minutes and consult a phy-sician immediately. Wash skin thor-oughly after use. Only use with ade-quate ventilation and use of an ap-proved respirator is recommended. Keep out of the reach of children and pets. Material Safety Data Sheets (MSDS) are available upon request from MRT.

6. Availability
MRT Fly Ash is available in many parts of the United States and portions of Canada. Contact MRT as listed in section 2 for specific information.

7. Warranty
No one is authorized to make any modifications or additions to this war-ranty. Mineral Resource Technologies, Inc. (MRT^®) warrants that MRT Fly Ash shall be in accordance with infor-mation herein when used as directed. MRT makes no warranty or representa-tion, either expressed or implied, with respect to this product, and disclaims any implied Warranty of Mer-chantability of fitness for a particular purpose. As MRT has no control over the other ingredients mixed with this product or the final application, MRT does not and cannot warrant the fin-ished work. IN NO EVENT SHALL MRT BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, OR CONSEQUENTIAL DAM-AGES ARISING OUT OF THE USE OF THIS PRODUCT, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAM-AGES. IN NO CASE SHALL MRT’S LI-ABILITY EXCEED THE PURCHASE PRICE OF THIS PRODUCT.

8. Technical Services
MRT has technical representatives and a Technology Center. For assistance contact MRT at (800) 615-1100.
^© Copyrighted 2006 by Mineral Resource Technologies, Inc., A CEMEX Company

Información Técnica y una copia de este Documento de Información esta disponible en Español. Por favor llamar a MRT al 800 615-1100 para conseguir esta información.

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