ASTM C642 PDF

You are on page 1of 3 Search inside document Standard Test Method for Density, Absorption, and Voids in Hardened Concrete1 This standard is issued under the fixed designation C ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. If the specimen was comparatively dry when its mass was first determined, and the second mass closely agrees with the first, consider it dry. If the specimen was wet when its mass was first determined, place it in the oven for a second drying treatment of 24 h and again determine the mass. If the third value checks the second, consider the specimen dry.

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Tweet Pin It Numerous international standards are now available but there are concrete standards that every quality engineer and civil engineer needs to know. These standards are the main reasons why there are specifications because most of the specifications are based on the international standards, may it be British standards or American standards or Indian Standards.

Here are the seven international standards for concrete that you should learn and use. This standard should be used by contractors, manufacturers, clients, and consultants for construction projects. This is a European standard for designing concrete structures. In addition, this standard can be normal weight, lightweight and heavyweight.

Also, this concrete specified may be mixed on-site, ready mixed or plant produced such as precast concrete. This standard is important as concrete in itself is the main materials used in construction.

Making and curing specimens for strength tests. This standard specifies the methods for making specimens and curing of these samples for the different concrete strength tests.

This talks about the preparation to the proper filling of concrete cylinders or molds, to the compaction of concrete, the ways to level the concrete surface, the curing itself up to the proper way of transporting these test specimens. This standard is important for engineers to know the ways to prepare, safe keep, and handle concrete specimens. Concrete specimens are important in every project as it determines if the casted concrete has truly reached the designed strength.

Without it. Improper preparation may deliver incorrect actual strength that is disastrous for the project itself. Although most of the test methods and reference notes of the test are self-explanatory, it is relevant as this standard is useful in the creation of baseline data needed for conversions between volume and mass for the hardened concrete.

In addition, it can be used for engineers to know the conformance with specification of hardened concrete and to know the differences from a certain point to another in the same mass of concrete.

BS : Testing Concrete: Method for the determination of water absorption This standard specifies the proper method for the determination of water absorption of concrete samples that is cored from the structure or any precast member.

In addition, the method specified may determine the water absorption of concretes that is cast into cylinders or prisms wherein the surface to its volume ratio may be calculated and where there should be no point of the sample specimen is greater than 50 mm from the free surface. The contents of this standard include the scope. This standard is relevant as concrete in itself is not watertight. Hydraulic cement are most common in the market which is why it is important to know its characteristic with respect to analyzing its chemical compounds.

This standard test would provide a baseline data schemes of analysis for hydraulic cement and is also needed in those areas where conformances to various chemical standards and specification is being questioned.

This standard is really of use as the acceptance of criteria, tolerances, air contents and required performances for workability are all discussed thoroughly. A certain portion of this standard also discusses the applicability of the fiber-reinforced concrete for shotcrete works.

Shotcrete works are universally accepted thus it should as well be experimented to maximize its use. BS EN : Testing fresh concrete, a slump test By far the most common standard every engineer should know. Concrete in itself is very sensitive to changes as due to its viscosity when it has not settled yet. This standard specifies the extremes of the measurement of slumps and other than the specified parameters, the concrete may be unsuitable to be used on site.

In addition, this standard also states that if the concrete continues to deform a minute after the de-molding, the slump test is unsuitable. This is important as this standard will teach engineers the proper way of testing fresh concrete particularly the slump test which is used almost every day on site. These are some of the test most common standard every engineer should be knowledgeable of. What standards do you use for concrete in your project?

Do you use the standards mentioned above? Welcome to my blog. No Responses.

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