Geological workMiddle: ① DeterminationrockThe purpose of water absorption is to evaluate somebuilding materialThe quality of mineralsmineProvide data basis for mining design and solving relevant engineering geological problems.Water absorption of rockMainly determined byporositySize of.adoptFeeding hopperJoin toGlass perforated plateStart the stopwatch at the same time to record different timesGlass capillaryReading of internal scale (ml).The measured time is as follows: 15 seconds, 30 seconds, 45 seconds, 1 minute, 2 minutes, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes.
materialWater absorptionOfmeasurement。It refers to the increase of material immersed in water for a certain time at a certain temperatureWeight percentage。
Water absorption refers toStonestaynormal atmospheric pressureThe ability to absorb water.withStoneThe absorbed water shall be measured andpercentageIndicates it.StoneThe water absorption of is determined by the number and size of the voids and the way the particles are arranged.StoneIt depends on whether it is easy to get wet and the condition of removing air from the gap.The smaller the water absorptionStoneThe denser the harder, such asigneous rockIts water absorption is often less than 1%, and some densesedimentary rockAbout 3%, some loosesedimentary rockbeChangda8% or more.The greater the water absorption of stone, the worse its engineering properties.
igneous rockThe water absorption rate ofStoneThe invasion surface of the middle capillary is transferred to the other side.We often seeStoneUneven wetting on the surface is such a phenomenonCapillary actionTypical of.Generally,igneous rockThe capillary system offeldsparas well asolivine、pyroxene、Hornblende、BiotiteIron and magnesium contained in, etcmineralAnd the interface crack surface.
Five pieces can be prepared for measuring water absorptionStoneThe volume of each piece is about 50 cubic centimeters. Remove the dust first, dry it completely, and then weigh it.After the weight is obtained, put it inMeasuring cylinder、ScrubberOr other containers, submerge to a quarter of the height of the sample with water for two hours;Add water to the half height of the sample, and then soak for three hours;Add water to submerge the sample to a height of three fourths until the sample is completely submerged;Then place the sample in waterTwenty-four hours, then take it out, wipe it gently with a cloth and weigh it, then press the following formulaStoneCalculate the water absorption of: W=(B-G)/G × 100%, where W is the water absorption, expressed as a percentage, G is the weight of the sample after drying, in grams, and B is the weight of the sample after saturated with water, in grams.
