03 05 00

No. 341-B

Specification

HYDRASET-FREE®

NON-CHLORIDE CONCRETE SET ACCELERATOR

Description
HYDRASET-FREE Non-Chloride Concrete Set Accelerator is a ready-to-use, liquid admixture. It accelerates initial setting time one to three times faster than normal for mortar and concrete.

HYDRASET-FREE improves workability and strength while it hastens the hydration of cement. It makes the mix easier to place and speeds construction by shortening the initial set and curing time. Labor and time are saved, because forms and other protection can be removed earlier...and finishing can be initiated. HYDRASET-FREE should not be limited to use during months when temperatures are in the 20º to 45º F (-7º to +7º C) range. Increased workability and earlier strength are also obtained when temperatures are in the 50º to 65 ºF (10º to 18º C) range, because any time the temperature drops below 70º F (21º C), there is a reduction in the rate of cement hydration. During cold and hot weather applications, follow ACI 305 & 306 recommendations.

Uses
HYDRASET-FREE is recommended for use during cool and cold weather to accelerate the set time and reduce the risk of frozen mortar and concrete mixes. However, HYDRASET-FREE can be used any time you want to accelerate the set time to decrease turnaround time.

Features/Benefits

• Accelerates initial set time one to three times faster than normal for concrete and mortar.
• Aids in strength development.
• Speeds up hydration of cement.
• Increases workability of concrete or mortar.
• Speeds construction due to reduced setting and curing time.
• Allows earlier removal of concrete forms or other protection.
• Permits earlier finishing.
• VOC compliant.

Packaging
5 Gallon (18.93 Liter) Pails
55 Gallon (208.20 Liter) Drums

Specifications
ASTM C 494, Type C
AASHTO M 194, Type C
Corps of Engineers CRD C 87, Type C

Application
HYDRASET-FREE is added directly to the mix water. Reduce the amount of water proportionally to compensate for the liquid addition. For masonry mortar, two quarts (1.89 liters) of HYDRASET-FREE for each 94 lb. (42.73 kg) bag of cement should be used. For mortar cements which are 50% Portland cement and 50% lime, one-half the amount, or one quart (950 ml) of HYDRASET-FREE is required.

For concrete, the following quantities are recommended:

Temperature Range Above 70º F (21º C) 70º to 32º F (21º to 0º C) 32º to 25º F (0º to -4º C) 25º to 20º F (-4º to -7º C)

Suggested Quantity of HYDRASET-FREE for each 94 lb. (42.73 kg) bag of cement 1 pt. (.47 L) 1 qt. (.95 L) 1 to 1 1/2 qt (.95 to 1.42 L) 2 qts. (1.89 L)

Precautions
HYDRASET-FREE affects only the Portland cement portion of the mix and is not an antifreeze for the water portion. Protect from freezing. HYDRASET-FREE has no effect on straight lime mortars and should not be used with oxychloride stuccos. Use HYDRASET-FREE directly from the factory-sealed container; do not dilute. Avoid direct contact. Ingestion may cause moderate to severe irritation of the digestive tract. Read and follow complete application information and precautions on container, prior to use. Consult product Material Safety Data Sheet for complete health and safety information.

This material last updated July, 2006.