TDA® Quality Improvers are a family of cement additives that improve the strength or other performance characteristics of cement. They are aqueous compositions of grinding aids with set accelerating, water reducing or strength enhancing compounds, all carefully controlled and accurately blended for constant quality and optimum performance.
Product specifications for the most widely used TDA® formulations are as follows:
|TDA® J||1.22 (±0.01)||6 - 8|
|TDA® N||1.21 (±0.01)||8 - 10|
|TDA® 710||1.34 (±0.02)||8 - 10|
|TDA® 770||1.17 (±0.01)||8 - 10|
|TDA® 1223||1.15 (±0.05)||6 - 8|
|TDA® 7014||1.03 (±0.02)||9 - 12|
Product specifications for other TDA® formulations are available through GCP Field Engineers.
One of the key benefits of TDA® additives is their ability to increase both the grinding efficiency and cement strengths to a degree unequalled by conventional grinding aids.
- Increased early and long-term compressive strengths for the production of better quality cements.
- Reduced cost of cement production through reduced unit grinding costs and through replacement of clinker with reactive additions such as pozzolans, blast furnace slag and fly ash, or with fillers such as limestone.
The chemical action of TDA® additives decreases the interparticle attraction between cement grains both in dry form and in water, and increases the rate of hydration of cements. Additional advantages of TDA® additives include:
- Increased grinding efficiency resulting in increased mill output, higher cement fineness and reduced unit power input and grinding costs.
- Increased workability (flow) of cement mortars and concretes.
- Increased cement flowability for reduced pack set or “silo set” of cements, resulting in lower handling costs and reduced waste.
Applications of TDA®
Laboratory mill evaluations of clinker and other additions are recommended to determine initial blend proportions, grinding efficiency, pack set index, mortar flow and compressive strengths of cements to enable GCP to formulate the most effective TDA® product for each condition.
TDA® additives are sprayed into the mill’s first compartment or added onto the clinker conveyor belt. Suitable dispensing pumps with adjustable flow rates should be used for accurate dosing and for optimum performance of TDA®.
Dosage rates of TDA® can differ significantly (from 0.03% to 0.3%) depending upon the particular formula being used. Field Engineers can provide an estimate of the optimal dosage for any individual TDA® product, but in all cases, the actual addition rate should be determined in cement mill tests.
TDA® additives should be accurately proportioned through a calibrated dosing system, suitable for the cement mill and output required.
TDA® is approved for use under the ASTM C465 specification as a non-harmful processing addition for cement.
TDA® is supplied in 210 L (55 gal) drums. TDA® may also be supplied in bulk in certain locations. It contains no flammable materials.
Protect from freezing. However, if freezing should occur, the product should be thawed out slowly and re-mixed thoroughly prior to use.
Shelf life is minimum 12 months in manufacturer’s containers.
Field Engineers from GCP are available to assist in laboratory and mill test evaluations of TDA®. Complete testing equipment and methods for analyzing mill performance are also available during plant trials.
Performance of Selected Products in the TDA® Family
|Products||Typical Range g/t||Typical Dosage g/t||Contribution to Cement Cl g/t||Cement Flowability Packset||Grinding Aid||Water Demand||Setting Time||Compressive Strength 1-3 Days||Compressive Strength 28 Days|
Indication based on Typical Performance = Unchanged (-) Decrease (+) Increase * Improvement ** Good Improvement *** Strong Improvement **** Very Strong Improvement
Comparative Results of the Efficiency of TDA® vs a Competitive Product (in industrial tests)
Objectives: TDA® 7014 – Typical Performance Data
|Additive||Product xyz||TDA® 7014||Product xyz||TDA® 7014|
Cement Additive Dosage
Energy consumption (kWh/t)
40 µ residues
|Compressive Strength (MPa)|
|Compressive Strength (MPa)|
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We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use that would infringe any patent, copyright or other third-party right.
TDA is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.
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GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140, USA
This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.
Last Updated: 2018-11-29