SECTION 401
(m) Desk brush and floor broom.
(n) Sample splitter (riffle type), chute width 1- 1/2 to 2”
(0) Microwave oven when drum mix plant is used.
(p} Minimum of one metal sample pail for each hot bin.
(q) Lavatory with toilet (See 698.2.2.4) and wash basin, unless approved otherwise.
(r) Water, hot and cold, and water suitable for drinking. (Fountain style will be acceptable),
(s) Telephone with private line.
(t) Drying oven, minimum of 3.5 fe.*
(u) Equipment sufficient to perform AASHTO T 209.*
(v) Water cooled diamond saw capable of cutting 6” road cores.
(w) High Speed Internet Connection - Each laboratory (on State-bid projects) will be provided with bi-directional
Internet access having a minimum data rate of 256K bps.
(x) Wheelbarrow when a drum mix plant is used.
*All ovens other than microwaves shall be vented to the outside.
3.1.7.3. All of the foregoing testing equipment shall be in good condition and shall be replaced or repaired by the Contractor
if, during the duration of the project, it becomes unsuitable for testing purposes. Testing equipment shall be calibrated by the
Contractor in accordance with 106.03. The above mentioned equipment is for operation of a single plant.
3.2. Storage of Asphalt Binder — General.
3.2.1 Tanks for storage of asphalt binder shall be of minimum 10,000 gal capacity and equipped for heating the material
under effective and positive control at all times, to the temperature requirements set forth in the specifications for the paving
mixture. Heating shall be accomplished by steam or oil coils, electricity, or other means such that no flame shall come in contact
with the heating tank.
3.2.2 A complete system providing for continuous circulation of the asphalt binder between the storage tank and the
proportioning units shall be employed. The discharge end of the circulating pipe shall be maintained below the surface of the
asphalt binder in the storage tank to prevent discharging the hot asphalt binder into the open air.
3.2.3 The Contractor shall provide in the asphalt binder feed lines connecting the plant storage tanks to the asphalt binder
weighting system or spray bar a sampling outlet consisting of a valve installed in such a manner that samples may be withdrawn
from the line slowly at any time during plant operation. The sampling outlet shall be installed between the pump and the return
discharge line in such a location that it is readily accessible and free from obstruction. A drainage receptacle shall be provided
for flushing the outlet prior to sampling.
3.3. Control of Asphalt Binder — General.
3.3.1 Satisfactory means either by weighing or metering shall be provided to obtain the proper amount of bituminous
material in the mix within the tolerance specified. Means shall be provided for checking the quantity or rate of flow of bituminous
material into the mixer as follows:
(a) Metering devices for asphalt binder shall indicate accurately to within 1.0 percent the amount of asphalt binder
delivered. The section of the asphalt binder flow line between the charging valve and the spray bar shall be provided
with a three-way valve and outlet whereby the quantity delivered by the meter may be checked by actual weight.
The valve controlling the flow of asphalt binder to the mixer shall close tightly to prevent asphalt binder from
leaking into the pug mill during the mixing cycle. The meter shall be constructed so that it may be locked at any
dial setting to 0.1 gal and will automatically reset to this reading after the addition of asphalt binder to each batch.
The dial shall be in full view of the mixer operator. The size and spacing of the spray bar openings shall provide a
uniform application of asphait binder the full length of the mixer in a thin uniform sheet or in multiple sprays.
(b) Ifa bucket is used for weighing the asphalt binder, the bucket shall be of sufficient capacity to hold and weigh the
amount required for a batch in a single weighing. The filling system and bucket shall be of such design, size, and
shape that asphalt binder will not overflow, splash, or spill outside the confines of the bucket during filling and
weighing. The filling system and bucket shall be so arranged as to deliver the asphalt binder in a thin uniform sheet
or in multiple sprays over the full length of the mixer, The time required to add the asphalt binder shall be not more
than 15 seconds.
(c) Asphalt binder scales shall conform to the requirements for aggregate scales as specified in 3.1.6.7. Beam type
scales shall be equipped with a tare beam or adequate counter-balance for balancing the bucket and compensating
periodically for the accumulation of asphalt binder on the bucket.
2016 NHDOT
Go To=> TOC Division 106 Division 200 Division 300 Division 400 Standard
Division 500 = Division 600 Division 700 Specifications
