TB-0609 - ADVA® XT2

/ concrete / mix design

Introduction

ADVA® XT2 is recommended primarily for use in ready mixed concrete applications where improved slump life is desired or required due to hot ambient conditions, long haul times and tight slump specifications. ADVA XT2 dosage rates typically range from 4 to 6 oz/100 lbs (260 to 390 mL/100 kg) of cementitious and will vary depending on mix design specifics, slump life requirements, and ambient and concrete temperatures. ADVA XT2 can be used with most other admixtures including standard, mid-range and high range water reducers, accelerators, retarders, air entraining agents and specialty admixtures. ADVA XT2 is also fully compatible in mix designs containing pozzolans including flyash, slag and silica fume. This technical bulletin details recommended best practices for ADVA XT2 field usage and plastic and hardened properties of several field tested ADVA XT2 mix designs.

Slump Retention

Figure 1, below, depicts estimated time (from concrete batching) to approximate 3 in. (75 mm) of slump loss as a function of ADVA XT2 dosage rate. This graph may be utilized to select a starting point for ADVA XT2 dosage rates prior to running trial mixes to confirm slump retention properties with a specific mixture and set of materials. Several factors including cement/pozzolan type and properties, other admixtures and various production and environmental conditions can also significantly impact slump life properties.

Water Reduction

ADVA XT2 meets the requirements of ASTM C494 as a Type A water reducer. Water reduction can be expected to slightly increase as dosage rates increase. Therefore, at higher ADVA XT2 dosage rates, it may be necessary to either cut water content slightly or reduce base water reducer or superplasticizer dosage rate.

Compressive Strength

At equal water contents, ADVA XT2 will have a negligible impact on early and later age compressive and flexural strengths compared to the base mix. If water contents are reduced to compensate for ADVA XT2 water reduction properties, a proportionate strength gain will be noted.

Set Time

The addition of ADVA XT2 will extend the initial setting time, on average from 0 to 50 minutes. Impact on set time will depend on the addition rates, mixture proportions, and ambient and concrete temperatures.

Air entrained concrete

ADVA XT2 has been extensively field tested in a wide range of air entrained concrete mix designs and consistently demonstrated stable and good quality air void systems. Typically, AEA dosage rates for ADVA XT2 concrete will be similar to the base mix without ADVA XT2. Again, trial mixes are recommended to establish AEA dosage rates and air content variation over time for a specific concrete mixture.

Compatibility with other admixtures

ADVA XT2 is a polycarboxylate based technology and therefore is fully compatible with most other admixtures. However, ADVA XT2 is not recommended for usage in concrete containing naphthalene (NFSC) based admixtures including Daracem® 19.

Table 1 - Examples of ADVA XT2 North America Field Performance

  Cool Climate
Non air entrained Concrete
Moderate Climate
Non air entrained Concrete
Hot Climate
Non air entrained Concrete
  Reference ADVA XT2 Reference ADVA XT2 Reference ADVA XT2
Mix Design
Specifics
lbs/yd3 (kg/m3)
648 (384) cement
293 (174) H2O
1304 (774)
3/4 in. CA
574 (340) 3/8 in. CA
1362 (808) FA
646 (383) cement
294 (174) H2O
1327 (787)
3/4 in. CA
575 (341) 3/8 in. CA
1340 (795) FA
615 (365) cement
257 (152) H2O
1203 (714)
3/4 in. CA
505 (300) 3/8 in. CA
1415 (839) FA
615 (365) cement
257 (152) H2O
1203 (714)
3/4 in. CA
505 (300) 3/8 in. CA
1415 (839) FA
568 (337) cement
275 (164) H2O
1767 (1048)
1 1/2 in. CA
1381 (819) FA
585 (347) cement
277 (164) H2O
1762 (1045)
1 1/2 in. CA
1371 (813) FA
Admixtures
oz/100 lbs
(mL/100 kg)
5 (326) ADVA 190
Reference
5 (326) ADVA 190
3 (195) ADVA XT2
6 (391) ADVA 190
Reference
5 (326) ADVA 190
5 (326) ADVA XT2
12 (782) ADVA 140(M)
Reference
12 (782) ADVA 140(M)
5 (326) ADVA XT2
Concrete Temp °F (°C) 65°F (18°C) 63°F (18°C) 85°F (29°C) 87°F (31°C) 90°F (32°C) 91°F (33°C)
Ambient Temp °F (°C) 40°F (4°C) 40°F (4°C) 76°F (24°C) 80°F (27°C) 89°F (32°C) 89°F (32°C)
Time (minutes)
to final slump
60 175 55 95 55 95
Initial Slump in. (mm) 8.75 (222) 9 (229) 9.5 (241) 8.75 (222) 8 (203) 9 (229)
Final Slump in. (mm) 4 (102) 5 (127) 3.25 (82) 3.5 (89) 4.25 (108) 4.5 (114)
Initial Air (%) 1.5% 1.5% 1.7% 2.0% 5.5% 5.7%
Final Air (%) 2.5% 2.3% 2.2% 2.3% 5.8% 3.5%
7 Day Compressive
Strength psi (MPa)
6284 (43.3) 5890 (40.6) 5405 (37.3) 5250 (36.2) 3300 (22.7) 3690 (25.4)
28 Day Compressive
Strength psi (MPa)
7456 (51.4) 7833 (54.0) 6655 (45.9) 6560 (45.2)    
Set Time (hrs:min) 9:00 10:20 4:10 3:30 3:05 3:03

 

 

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GCP0083 TB-0609-0817

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: 2020-03-09

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