EXP 684

High-range water-reducing admixture ASTM C494 Type A and F and ASTM C1017 Type I

Product Description

EXP 684 is a high efficiency, polycarboxylate-based high-range water reducer designed for the production of a wide range of concrete mixes, from conventional to self-consolidating concrete. It is designed to impart extreme workability without segregation to the concrete. EXP 684 is supplied as a ready-to-use liquid that weighs approximately 8.5 lbs/gal (1.0 kg/L).

EXP 684 does not contain intentionally added chlorides.

Product Advantages

  • Excellent dosage efficiency, moisture control and air control
  • Superior air entrainment control
  • Enhanced concrete cohesiveness with low viscosity for rapid placement
  • Superior finish on cast surfaces
  • Enhanced strength development

Uses

EXP 684 is a plant-added superplasticizer that is formulated to impart improved workability to the concrete and to achieve high early compressive strength as required by the precast industry. EXP 684 can be used for the production of self-consolidating concrete (SCC) in precast/prestressed applications and may be used in conventional concrete production.

EXP 684 may be used in low water-cementitious ratio applications where concrete stability and improved tolerance to concrete material variability are required.

EXP 684 may be used to produce concrete with very low watercementitious ratios while maintaining normal levels of workability.

Addition Rates

EXP 684 is an easy to dispense liquid admixture. Dosage rates can be adjusted to meet a wide spectrum of concrete performance requirements. Addition rates for EXP 684 can vary from 6 to 30 fl oz/100 lbs (400 to 2000 mL/100 kg) with the type of application, but will typically range from 9 to 18 fl oz/100 lbs (600 to 1200 mL/100 kg) of cementitious. Should conditions require using more than the recommended addition rate, please consult your GCP representative.

Mix proportions, cementitious content, aggregate gradations and ambient conditions will affect EXP 684 dosage requirements. If materials or conditions require using more than the recommended addition rates, or when developing mix designs for self-consolidating concrete, please consult your GCP representative for more information and assistance.

Compatibility with Other Admixtures and Batch Sequencing

EXP 684 is compatible with most admixtures as long as they are added separately to the concrete mix. However, EXP 684 is not recommended for use in concrete containing naphthalene-based admixtures including Daracem® 19 and Daracem 100, and melamine-based admixtures including Daracem 65. In general, it is recommended that EXP 684 be added to the concrete mix near the end of the batch sequence for optimum performance. Different sequencing may be used if local testing shows better performance. Please see GCP Technical Bulletin TB-0110, Admixture Dispenser Discharge Line Location and Sequencing for Concrete Batching Operations for further recommendations.

Pretesting of the concrete mix should be performed before use and as conditions and materials change in order to ensure compatibility with other admixtures, and to optimize dosage rates, addition times in the batch sequencing and concrete performance. For concrete that requires air entrainment, the use of an ASTM C260 air-entraining agent (such as Airalon®, Daravair® or Darex® product lines) is recommended to provide suitable air void parameters for freeze-thaw resistance. Please consult your GCP representative for guidance.

Packaging & Handling

EXP 684 is a light blue liquid available in bulk, delivered by metered trucks, or in totes and drums. EXP 684 will freeze at approximately 32°F (0°C) but will return to full functionality after thawing and thorough mechanical agitation.

Dispensing Equipment

A complete line of accurate, automatic dispensing equipment is available.

EXP 684 ASTM C494 Type F High-Range Water Reducer Test Data

  US Units   Metric  
  Control EXP 684 Control EXP 684
Cement (pcy) (kg/m3) 516 520 306 309
Coarse aggregate (pcy) (kg/m3) 1929 1950 1144 1157
Fine aggregate (pcy) (kg/m3) 1253 1297 743 770
Water (pcy) (kg/m3) 245 215 145 128
w/cm 0.475 0.414 0.475 0.414
Slump (inches) (mm) 3.75 3.25 95 80
Plastic air (%) 5.5 5.6 5.5 5.6
Compressive strength        
1 day (psi) (MPa) 14590 2270 11 15.7
7 day (psi) (MPa) 4290 5390 29.6 37.2
28 day (psi) (MPa) 5690 7590 39.2 52.3
Initial set time (hr:min) 4:52 4:16 4:52 4:16
Length change 28 day (%) -0.029 -0.025 -0.029 -0.025
Freeze-thaw resistance (RDME %) 99 96 99 97

gcpat.com | North America Customer Service: 1 877-4AD-MIX1 (1 877-423-6491)

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.

DARACEM, AIRALON, DARAVAIR, and DAREX are trademarks, 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.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140 USA.

In Canada, 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.

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

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