As mentioned, building materials are selected primarily based on their properties, of course not forgetting certain aesthetic qualities. These properties are evaluated by assaying.
The assay used in the construction industry can be field or laboratory, can be destructive and nondestructive. In any case, the assay must adhere to standard rules to ensure reproducibility of results. In the absence of standards for the conduct of trials, both the owner of the work as the builder or contractor must agree on the procedure, it is recommended that this procedure is in accordance with the experimental progress that has been established in the respective area. You cannot conceive of a quality control program in the construction without performing tests or tests.
In Mexico the testing of construction materials are made according to known Mexican standards NMX, NMX eg C-61 to determine the compressive strength of Portland cement, this rule is similar to the American standard ASTM C-109. In fact, many Mexican standards are based on various adaptations of American standards from ASTM, most notably.
The adoption of standards does not guarantee the quality of works, unless there is adequate supervision or inspection of construction work. Furthermore, it is essential that both the technical staff performing the tests as the same test lab to be accredited. This means that for a test to be properly performed, it must be performed by qualified personnel of a testing laboratory certified by the appropriate government agency.
In Mexico, the Federal Law on Metrology and Standardization, published in 1992 establishing the National System of Accreditation of Testing Laboratories (SINALP), this agency under the Directorate General of Standards aims to bring together accredited laboratories. The accreditation of laboratories is processed through the various agencies and committees that constitute the SINALP, such as laboratories wishing to provide services to the construction industry must meet the requirements established by the Mexican Accreditation Entity (EMA). Accreditations processes take time require much effort to maintain and renew the accreditations since they have a validity period. There are already many accredited laboratories operating in the Mexico sections of concrete, aggregates and cement and continually add laboratories that will allow better coverage of other material from the construction industry.
As can be seen, the existence of SINALP favors a competitive environment among builders, as the accredited laboratories are used has increased confidence in the results of laboratory tests and this allows for better quality control of works.
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