DPWH-Biliran DEO
conducts quality testing on construction materials
By
NIKOLAI MERACAP
February 14, 2019
NAVAL, Biliran –
The Department of Public Works and Highways (DPWH) Biliran District
Engineering Office (DEO) Quality Assurance Section (QAS) conducted
various test on construction materials. Proper method of sampling
and testing of construction materials were observed as it contribute
greatly to the accuracy of test result.
Sampling is equally as
important as the testing and the sampler used every precaution to
obtain samples that will show the nature and the condition of the
materials which they actually represent. Sampling of construction
materials for quality tests were conducted on various projects by
the contractor and DPWH-Biliran DEO materials in-charge to ascertain
that all materials incorporated into the work meet the minimum
requirement by the DPWH.
Test are made in the field
or at the laboratory to determine the quality or suitability of the
materials proposed to be incorporated in DPWH projects. All samples
submitted were tested in accordance with American Association of
State Highways Transport Officials/ American Standard Testing
Materials (AASHTO/ASTM) test methods and procedures and were
governed by AASHTO/ASTM Standard Specifications as adopted by DPWH.
Quality tests on soil,
fine and coarse aggregates were performed at the district
laboratory. Sieve analysis was conducted on aggregates samples to
determine the grading of materials proposed for use as aggregates.
Result from the test was used to determine compliance of the
particle size distribution with applicable specification
requirements & to provide necessary data for control of the
production. Specific gravity and absorption test were also performed
by the laboratory technicians on the fine and coarse aggregates,
both are important properties that are required for the design mix
of concrete. Other test such as soundness, abrasion, organic
impurities and mortar strength test, all of which are significant
test needed to warrant good quality of materials used were all
conducted.
Concrete cylinder and beam
samples were also tested for its compressive and flexural strength
with the use of the compression testing machine. The result of this
test may be used as basis for evaluating the integrity of the
structures constructed on site; determination of compliance with
specification, control of evaluating effectiveness of admixtures and
similar uses.
Reports related to quality
control implementation were submitted to monitor the status of each
project together with problems encountered in the field and
corrective measures to correct any noted deficiencies or defects due
to malpractice and noncompliance to the DPWH policies and standard
specifications.