work was done.
1.5
EQUIPMENT AND TECHNIQUES DEMONSTRATION
Equipment and techniques of operation shall be demonstrated in an approved
location and shall be subject to approval. Dependable and sufficient
equipment, appropriate and adequate to accomplish the work specified, shall
be assembled at the work site in sufficient lead time before the start of
the work to permit inspection, calibration of weighing and measuring
devices, adjustment of parts, and the making of any repairs that may be
required. The equipment shall be maintained in good working condition
throughout the project.
1.5.1
Cleaning equipment shall not cause staining, erosion, marring, or other
damage or changes in the appearance of the surfaces to be cleaned.
1.5.1.1
Sandblasting
Sandblasting equipment will not be allowed for cleaning masonry surfaces.
1.5.1.2
Water Blasting
Water blasting equipment shall include a trailer-mounted water tank, pumps,
high-pressure hose, wand with safety release cutoff control, nozzle, and
auxiliary water re-supply equipment. The equipment shall not be operated
at a pressure which will cause etching or other damage to the masonry
surface or mortar joints. The equipment shall be operated at a discharge
capacity of 0.38 to 3.5 Mpa 55 to 500 psi and 9.5 to 11.4 Lpm 2.5 to 3 gpm
for general surface cleaning operations. The water tank and auxiliary
re-supply equipment shall be of sufficient capacity to permit continuous
operations. The Contractor shall provide protective covers and barriers as
required to prevent over-spray onto adjacent surfaces.
1.5.2
Drilling Equipment
Equipment used to drill holes in masonry, for patch anchors and other
applications, shall be standard handheld masonry drills, commonly used for
drilling small holes in concrete and masonry. The drill shall be a small,
powered, handheld type, using rotary drilling mode only. Impact and rotary
impact type drills will not be allowed.
1.5.3
Finishing and Texturing Equipment
Equipment and hand tools used for placing, finishing and texturing masonry
and mortar shall be commercially available and commonly used in masonry
construction and repair. Surface grinders, impact tools, and other
equipment shall conform to the specified requirements, except as
specifically required by the type of finish and texture.
1.5.4
Compressed Air Supplies
Compressed air equipment shall deliver clean, oil and moisture free
compressed air at the surface to be cleaned. The compressed air line shall
have at least two in-line air filters to remove oil and moisture from the
air supply. The compressed air supply shall be tested during each shift
for the presence of oil and moisture.
SECTION 04900
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