ACI - Aggregate Base Testing Technician

Testing - answer-Sampling should be done very carefully because it is as important as ____________. Conveyer belts Transport units Roadways Stockpiles - answer-What are the four sources from which field samples can be obtained? contaminated, damaged - answer-Sampling containers for aggregate samples should be made so that the contents will not be lost, _____ or _____. Nonrepresentative sample - answer-Not using correct procedures for reducing samples to testing size can result in a _____. False - answer-T or F Generally, small samples are most representative of the total supply. True - answer-T or F There are some instances in which differences between test samples can't be avoided. Laws of chance - answer-What determines whether large-size particles are equally distributed among test samples that have been reduced? Method A, mechanical splitter - answer-Which method of reducing a sample must be used with fine, dry aggregate? Moisten the sample - answer-What must be done to the sample if method B or C is used? Dry the sample - answer-What do you do if the sample is wet and Method A is to be used? Coarse aggregate, or mixtures of coarse and fine aggregate - answer-Method C, miniature stockpiling, cannot be used for which type of aggregate? Method A - answer-Which method involves the use of chutes, holding receptacles, and hoppers or straight-edged pans? 8 - answer-Sample splitters must have how many equal width chutes for coarse aggregate? 12 - answer-Sample splitters must have how many equal width chutes for fine aggregate? conical pile - answer-In Methods B and C the sample is shoveled into a ____ before it is flattened and divided. Canvas blanket or tear resistant tarp - answer-When using Method B, what is an alternate surface that can be used when reducing the sample? diagonally opposite - answer-When quartering a sample, retain two _________ quarters and reject the other two. 5, random - answer-In miniature stockpile sampling, obtain the sample by selecting at least ____ increments of material from ____ locations in the stockpile. 60*C/140*F - answer-The drying apparatus used for dry preparation of a sample is any suitable device capable of drying samples at a temperature not exceeding _____. representative, fines - answer-A suitable sample splitter is one capable of obtaining ____ portions of the sample without appreciable loss of ____. 110, 60 - answer-For particle size analysis, material passing a 2.00mm (No. 10) sieve is required in amounts equal to approximately ___ g for sandy soils and approximately ___g for silty or clayey soils. 25, 10 - answer-For specific gravity, material passing a 2.00mm (10) sieve is requires in amounts of at least ____g when the volumetric flask is used and at least ____g when the stoppered bottle is used. 2.00mm (No. 10), Two - answer-For the physical test, the remaining portion of the material passing the _____ sieve shall be separated into ____ parts by means of a 0.425mm (40) sieve. Pulverizing operation - answer-For the physical test, if the sample contains brittle particles such as flakes of mica, fragments of seashells, etc, the ____________ shall be done carefully to free the finer material that adheres to the coarse particles. The liquid limit of a soil - answer-What is defined as he water content at which the soil passes from a plastic to a liquid? corrosion, mass, disintegration - answer-(LL) suitable containers should be made of material resistant to ____ and not subject to change in ____ or ___ on repeated heating and cooling. 100g - answer-(LL) A sample with a mass of about ___ shall be taken from the thoroughly mixed portion of the material. 13, one half - answer-Wear on the liquid limit device is considered excessive whe the point of contact on the cup or base exceeds approximately ____mm in diameter, or when any point on the rim of the cup is worn approximately ____ the original thickness. 10.0 +-0.2mm - answer-(LL) Adjust the height of drop of the cup so tha the point on the cup that comes in contact with the base rises to a height of____. 15-20 - answer-When using the curved grooving tool, the soil sample shall be place in the mixing dish and thoroughly mixed with ____ to ____mL of water by alternately and repeatedly stirring, kneading, and chopping with a spatula. False - answer-T or F Once testing has begun, additional dry soil may be added to the moistened soil if too much water is added. two revolutions per second, 13mm - answer-The liquid limit device is cranked at a rate of about _______ until the two sides of the sample come into contact at the bottom of the groove along a distance of about ____. False - answer-T or F To ensure accurate and consistent shocking, the base of the liquid limit device is to be held steadt with the free hand while cranking. Liquid Limit - answer-The number of shocks needed to close the groove of each sample is correlated with the moisture content to determine the _________ of the soil. False - answer-T or F All of the material in the cup is used for determining the moisture content for the liquid limit test. 25-35, 20-30, 15-25; 10 - answer-The liquid limit procedure is repeated until one determination is made in the ranges of ____, ____, and ____ and the range between each is at least ___. 25 shock - answer-The liquid limit is the moisture content corresponding to the intersection of the flow curve with the ___ ordinate. Plastic limit of a soil - answer-What is defined as the lowest water content determined at which the soil remains plastic? Plasticity index - answer-The _______ of a soil is the range in water content, expressed as a percentage of the ass of an oven dried soil, within which the material is in a plastic state. 115 - answer-The dish used for the plastic limit procedure should have a diameter of about ____mm.