The invention relates to a test method of aggregate apparent
relative density water absorption and apparatus. The method mainly includes: using vacuum method to reduce aggregate saturation period; using
alcohol concentrate soundex to confirm saturate face dry point; using
ultrasound fluid place method to compute aggregate volume. The show character of apparatus and
system are composed of three part of
machine body structure, sensor measurement and electronic
control data processing system and accessory equipment. Its key steps includes: (a) putting the aggregate into the oven
drying until constant weight, weigh the certain qualitative sample,
record the quality; (b) putting the aggregate into the vacuum suction device, add dense
alcohol, vacuumize to saturation; (c) with the steadied stirring under the sirocco, the saturation aggregate in the saturation face dry equipment, based on the
alcohol dense sensor to judge the saturation face dry state, weigh and
record the saturation face dry quality; (d) inject a dosing dense alcohol which is known density, measure the alcohol liquid level position,
record the liquid level height data;(e) compute aggregate apparent
relative density, bulk volume
relative density and water absorption based on the above data; (f) according to the relation between the dense alcohol density and the
water density, do the conversion between relative density and water (liquid)absorption, again according to the test temperature, do the
temperature correction of the relative density and water absorption. The invention achieves the full
automation of measuring the thick, thin aggregate apparent relative density, bulk volume relative density and water absorption; unifies the original measure method of thick, thin two different size aggregate. Effectively eliminates the subjectivity of
manual testing method, renders the test better accuracy and
repeatability; greatly reduces the time of test and manual intervention.