OO-C-2868
REQUIREMENTS
3.
3.1 Description. The central mix concrete plant, hereinafter called the
concrete plant, shall consist essentially of an aggregate bin with three
compartments, conveyor belts or screw conveyors, a weighing means, a cement bin
or silo, control console panel, water delivery, air, and hydraulic systems,
instruments and controls, delivery conveyors or gravity discharge. All
equipment shall be mounted on a single semitrailer chassis frame with kingpin.
When applicable, the plant includes a mobile tiltable or horizontal shaft
concrete mixer with stand and skid mounted diesel engine driven generator set.
3.2 First article. When specified in the contract or purchase order, a
sample shall be subjected to first article inspection (see 4.2.1, 6.2 and 6.3).
3.3 Safety. All rotating or reciprocating parts that are of such nature or
so located as to become a hazard to operating or maintenance personnel shall be
enclosed or properly guarded.
3.4 Standard commercial product. The concrete plant shall, as a minimum,
be in accordance with the requirements of this specification and shall be the
manufacturer's standard commercial product (see 6.6.1). Additional or better
features which are not specifically prohibited by this specification but which
are a part of the manufacturer's standard commercial product, shall be included
in the concrete plant being furnished.
3.5 Materials. Materials used shall be free from defects which would
adversely affect the performance or maintainability of individual components or
of the overall assembly. Unless otherwise specified herein, all equipment,
material, and articles are to be new and fabricated using materials produced
from recovered materials (see 6.6.2) to the maximum extent possible without
jeopardizing the intended use. Used or rebuilt products shall not be used.
3.6 Performance. The assembled concrete plant shall be rated for not less
3
3
than 100 yd (77 m ) per hour of pavement quality, 1-inch or 25 millimeters (mm)
slump concrete, based on a 1-minute mix cycle per batch, utilizing a six-bag mix
and 2-1/2 to 3-inch (63 to 76 mm) maximum sized aggregate; and not less than 100
3
3
yd (77 m ) per hour of structural quality, 3-inch (76 mm) slump concrete,
utilizing a six-bag mix and 1-1/2-inch (38 mm) maximum sized aggregate, and
within 1 Z4cent for cement of the preset requirement. Mix design shall be
verified by slump test method in accordance with ASTM C143. The batching of
aggregates and cement shall be synchronized with the demand cycle of the mixer.
The concrete plant, including the mixer unit when furnished, shall be capable of
being towed over an uneven dirt or gravel road at speeds up to 5 miles per hour
(mph) or 8 kilometers per hour (kph) and over paved highways at speeds up to 35
mph (56 kph) without damage, malfunction, or permanent set.
3.7 Construction. The concrete plant shall conform to CPMB Concrete Plant
Standards, complete with CPMB rating plates. The equipment shall be designed
and constructed to facilitate field maintenance. All adjustments and
replaceable accessories shall be readily accessible.
3.7.1 Aggregate bin. An aggregate bin having three approximately equal
compartments, for sand and two different sizes of aggregates, shall be
furnished. Total capacity shall be calculated in accordance with CPMB and be
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business