Downloaded from https://www.everyspec.com tioned so as to direct the two segments together without appreciable binding or loose motion on the guide rods. plates for heating aggregates, bituminous mntzwial, specimen molds, and compaction hammers. Required temperatuma for ma- terials range from 200” F. to 300° F, It is recommended that the heating units be ~hermoststically controlled to maintain the required temperatures. Shields, baflle plates, or sandbaths shall be used on the surfaces (If the hotphites to minimize localized over- heating. 2.7 Loading jack.
A loading jack (figures 10&l and 100-5) consisting of a screw jack, mounted in ~ testing frnme, which will produce a uniform vertical movement - of 2 inches per minute. An electric motor may be attached to the jacking mechanism. XOTE : In lieu of the loading jack, a mechanical or hydraulic testing machine (figure 100-6) may be used if the ra@ of movement can be maintained at 2 inches per minute while the load is applied. 2.11 Mixing appardus A metal pan or bowl. Hand mixing may be I.Ised;however, mechanics] mixing is recommended.
Any type of mechanical mixer may be used if the required mixing temperature can be maintained and a well-coated, homogeneous mixture can be produred in the allowable time. Two 10-quart mixing bowls and two wire stirrers are recommended. 2.8 Provinu ring mtsembly. One proving ring (figures 100-1 and 100-5 ) of 5.000- pound capacity and sensitivity of 10 pounds for lode up to 1,000 pounds and 26 pounds for loads between 1,000 and 6,000 pounds find equipped with a micrometer dial. The micrometer shall be graduated in 0,0001 inch increments. L’pper and lower proving ring attachments are r~uired for fnstening the provin~ ring to the testing frame and trwmrnitting the load to the breaking head.
NOTE: In lieu of the proving ring assembly, any suitable load-measuring device may be wsed, if the capacity and sensitivity meet the requirements. 2.12 Water bath. A water bath at least 6 iriches deep provided with mechanical water agitator. heating elements, and thermostatic controls capable of maintaining the bath ~v~ter at temperatures ranging from 100” F. to 140’ F, The bath shall have a perforated fnlse bottom or be equipped with a shelf for supporting specimens 2 inches ahve - the bottom of the bath. 29 Flowmeter. A flowmcter (figure 100-1 ) consisting of a guide sleeve nncl a gage.
The activating pin of the gage slides inside the guide sleeve with a slight amount of frictional resistance, and the guide sleeve S]ides free]y over the guide rod of the break. 213 Sieve shaker. .An.vtype of mechanic- al sieve tier provi&d it has a capacity of six full-height, 8-inch-diameter sieves. 214 Sieve Eight-inch-diameter sieves of the following sizes are required: 1-, %-, $+., -d ~-inch and NOS. 4, 10, 20, 40, 80, and 200. The sieves shall conform to the requirements of ASTM E 11. Large, rec- tanguhw-shaped screens and shaking facilL tws are recommended for preparation of lnrge samples. ing head.
The flowmeter gage shall be ad- justed to zero when in position on the break- ing head with a 4.000 plus or minus 0.005- inch-diameter metal cylinder inserted be Lween the breaking-head wgmenta. The flowmeter gage shnl) be graduntwl In O.O1- inch dividorm 215 Sink. One sink ~vith cold running vater to cool molded specimens prior to extrusion from thr mold cylinder. 210 Ovens or hotplate~, ovens or ht,t- Method 100 4