土壤自由膨胀率测定仪

土壤自由膨胀率测定仪适用于粘土的自由膨胀率，自由膨胀率为松散的烘干土粘在水中和空气中分别自由堆积的体积之差与在空气中自由堆积的体积比，以百分数表示，用以判定无结构的松散土粘在水中的膨胀特性。 本仪器符合交通部JTJ-2000标准要求。用于测定石料在液体中的膨胀率，广泛适用于各科研单位、学校、矿山、冶金，铁路，交通等部门。

The soil free swelling rate tester is suitable for the free swelling rate of clay. The free swelling rate is the ratio of the difference between the volume of the loosely dried soil sticking in the water and the air and the volume of free accumulation in the air. Used to determine the expansion characteristics of unstructured loose soil sticking to water. This instrument complies with the requirements of the Ministry of Communications' JTJ-2000 standard. It is used to determine the expansion rate of stone in liquid. It is widely used in various scientific research units, schools, mines, metallurgy, railways, transportation and other departments.

土壤自由膨胀率测定仪主要技术参数：

★无颈漏斗

★量土杯

★搅拌器

★量表：量程5mm、精度0.001mm的千分表

★水槽：160×160×130mm

★试样规格：圆柱体Φ50～60mm，高度约等于直径 正方体边长为50～60mm，两端面应平行且磨平

★外形尺寸：500×500×150mm

Main technical parameters of soil free expansion rate tester:

★ No neck funnel

★ Measuring Cup

★ Blender

★ Scale: dial indicator with a range of 5mm and an accuracy of 0.001mm

★ Water tank: 160 × 160 × 130mm

★ Specification of the sample: Cylinder Φ50 ～ 60mm, the height is approximately equal to the diameter. The side of the cube is 50 ～ 60mm.

★ Dimensions: 500 × 500 × 150mm

土壤自由膨胀率测定仪试验：

★取代表性风干土样碾碎，使其全部通过0.5mm筛。混合均匀后，取约50g放入盛土盒内，移如烘箱，在105～ll0℃温度下烘至恒温取出，放在干燥器内冷却至室温。 

★将无颈漏斗装在支架上，漏斗下口对正量土杯中，并保持距杯口l0mm距离，如图所示。 

★从干煤器内取出土样，用匙将土样倒入杯中，盛满后沿杯口刮平土面，再将量土杯中土样倒入匙中，把量土杯按图所示仍放在漏斗下口正中处。将匙中土样一次倒入后移开漏斗，用平口刀垂直于杯口轻轻刮去多余土样（严防震动），称记杯中土质量。 

★按本规程3规定，称取二个试样，进行平行测定，两次质量差值不得大于0.1g。 

★将A筒置于试验台上，注入蒸馏水30mL，并加入5mL5％的分析纯氯化钠溶液，然后将土杯中的土样倒入量简内。  

★用搅拌器搅拌量简内悬液，搅拌器应上至液面下至底，搅拌10次（时间约10s），取出搅拌器，将搅拌器上附着的上粒冲洗入量筒，并冲洗量筒内壁，使量筒内液面约至50ml。刻度处。 

★量筒中土样沉积后约每隔5h记录一次试样体积，体积估读全0.1 mL。读数时要求视线与土面在同一平面上，若土面倾斜，取高低面读数的平均值。当两次读书差值不大于0.2 mL时，即认为膨胀稳定。用此稳定读数计算自由膨胀率。 

★WX-2000土壤自由膨胀率测定仪按下列公式计算土样的自由膨胀率： FS=V-V0／V0 X 100 式中：FS一自由膨胀率，％，计算至1％； V-土样在量筒中膨胀稳定后的 体积，mL；   VO-量土杯容积，mL，即干土自由堆积体积。

★使用后立即擦拭干净，放于干燥处。

Test of soil free expansion rate tester:

★ Take a representative air-dried soil sample and crush it so that it all passes through a 0.5mm sieve. After mixing, take about 50g into the soil box, move it into an oven, bake it at a constant temperature at 105 ~ 110 ° C, and take it out in a dryer to cool to room temperature.

★ Install the neckless funnel on the support, the lower mouth of the funnel is aligned with the measuring cup, and maintain a distance of 10mm from the mouth of the cup, as shown in the figure.

Take out the soil sample from the coal dryer, pour the soil sample into the cup with a spoon, scrape the soil surface along the mouth of the cup when full, and then pour the soil sample from the measuring cup into the spoon. The illustration is still centered in the lower mouth of the funnel. Pour the soil sample in the spoon once and then remove the funnel. Use a flat-blade knife to gently scrape the excess soil sample perpendicular to the mouth of the cup (to prevent vibration), and weigh the mass of soil in the cup.

★ According to the regulations 3, two samples are weighed and measured in parallel. The difference between the two masses shall not be greater than 0.1g.

★ Put the A cylinder on the test bench, inject 30mL of distilled water, and add 5mL of 5% analytical pure sodium chloride solution, and then pour the soil sample in the soil cup into the volume.

★ Stir the suspension with a stirrer. The stirrer should be lowered to the bottom of the liquid surface and stirred 10 times (about 10s). Remove the stirrer, rinse the particles attached to the stirrer into the graduated cylinder, and rinse the graduated cylinder. Inner wall, make the liquid level in the graduated cylinder about 50ml. At the scale.

★ Record the sample volume every 5 hours after the soil sample is deposited in the graduated cylinder. The volume is estimated to be 0.1 mL. When reading, the line of sight should be on the same plane as the soil surface. If the soil surface is inclined, take the average of the high and low surface readings. When the difference between two readings is not greater than 0.2 mL, the expansion is considered stable. Use this stable reading to calculate the free expansion rate.

★ WX-2000 soil free expansion rate tester calculates the free expansion rate of soil samples according to the following formula: FS = V-V0 / V0 X 100 where: FS-free expansion rate,%, calculated to 1%; The volume after expansion and stabilization in a graduated cylinder, mL; VO-volume of measuring cup, mL, that is, the volume of dry soil free accumulation.

★ Wipe clean immediately after use and put in a dry place.