This standard is issued under the fixed designation C; the number Conversion and rounding given in Standard IEEE/ASTM SI. The intention of this article is to clarify the specifications listed in ASTM C, Standard Specification for Mixing Rooms, Moist Cabinets, Moist. ASTM C Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage. Tanks Used in the Testing of Hydraulic Cements and Concretes.

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Common Errors CCRL inspectors write many findings in their reports on curing facilities and associated records.

The water in a storage tank shall be saturated with calcium hydroxide to prevent leaching. C51 temperature recorders or data loggers are gaining popularity. Login to be able to comment. This will significantly help maintain the temperature and humidity requirements.

The Cure for The Cure: A Guide to ASTM C and Your Curing Facilities

It depends on the type of water and what is satm the water. The Cure for The Cure: The system used in most grocery store produce sections works very well for this purpose. The benefit of a chart recorder is that the information is readily available and in full view at all times, and labs that use these tend not to get written up for not evaluating the weekly temperature data.

From Table 1 it looks like it. Ast you have more than one tank, you have two options for configuration.

It aztm the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

No recording thermometer or thermostatic control is required.

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The air and mixing water temperatures and the relative humidity in the cement mixing room shall be maintained at specific values. Both curing tanks and moist rooms have their benefits and drawbacks. Without proper maintenance and upkeep, the misters will begin to drip water on the specimens before clogging entirely. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.


The size of your room will depend on how much space is available in your lab and how many samples you plan to store. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. ICS Number Code Most labs that choose this method use a fish pond circulator.

ASTM C Standard

This article can be utilized as a general guideline for curing materials that include Portland cement concrete, masonry mortar, masonry cement, concrete beams, grout, and hydraulic cement see Table 1. Trying to cut corners on curing can produce erroneous test results. While it is nice to be able to have all of the temperature records on a computer, CCRL inspectors report that laboratories using these data loggers often forget to download and evaluate the data. No other units of measurement are included in this standard.

Have you aastm wondered which option your competitor is using? Each laboratory will need to consider the unique requirements of their testing needs when designing and maintaining a curing facility.

Your review has been submitted successfully. Saturated C cure tanks have a considerable amount of excess calcium hydroxide sitting in the bottom of the tank. The first option is to equip each tank with a temperature recorder that is monitored weekly. Show oldest on top Show newest on top. You’ve already submitted a review for this item.

Asgm you for the comment! How much calcium hydroxide do you use per gallon of water for a cure tank? Requirements for Moist Rooms If your lab tests a lot of samples or tests a variety of materials, a curing room might be the best choice for you. Your comment must be approved first.

Special thanks to Jan Prowell and the other employees of CCRL who shared their experiences evaluating curing facilities and records. For tank maintenance, you are required to thoroughly stir each tank at least monthly to replace depleted calcium ions.


If the calcium hydroxide is disappearing when stirred, the water is not saturated. Subscribe to new comments. Also consider all the man hours lost to constant maintenance and quick-fixes, not to mention having to spend time writing corrective action reports for your AASHTO re: Historical Version s – view previous versions of standard.

Requirements for Curing Tanks If your lab chooses to use curing tanks alone not inside a curing roomthe following information should help clarify some of the requirements. Depending on the type of material you are working with, you should refer to the applicable specification or standard to determine whether you need to maintain tanks or a curing room, or even a tank within a curing room.

If you have to install a moist room against an exterior wall, try to give at least 6 inches of dead air space. The system shall be equipped with a temperature recorder and a reference temperature measuring device that are to be placed practically near to each other. In both moist cabinets and rooms, care must be taken to ensure air-tight seals on doors and walls. The gold standard for laboratory accreditation in the construction industry.

According to an informal poll of CCRL inspectors, the number of laboratories with curing tanks versus curing rooms is about evenly split.

The ability of a lab to properly cure and store specimens is vitally important to achieving accurate results on compression tests. Air in moist cabinet or moist room shall be saturated with moisture in order to provide specified storage conditions and air temperature shall be controlled with provisions made for heating, cooling, or both.

In both cases, extreme care must be taken to prevent water from dripping onto the stored specimens, since lime can leach out and lower the strength.