突起路标耐磨损性能测定仪 STT-930M

一、概述：

采用落砂法评价被测样品表面的耐损磨性能，适用于A1类，A2类突起路标。A3类可参照使用。

I. Overview:

The falling sａnd method is used to evaluate the wear resistance of the tested sample surface, which is suitable for A1 and A2 protruding road signs. Class A3 can be used by reference.

二、测试装置构成：

◆测试装置由垂直导砂管，校正漏斗，过滤网，样品架和砂子收集器组成。导砂管：可采用内径不小于150MM内壁光滑的实壁塑料管组成，长度为2850MM,导砂管的不垂直度不大于0.2°。

◆校正漏斗：校正漏斗的上口尺寸为120MM×40MM,高度100MM,四面坡角45°。上口四边应平直，尖锐，保证落在口边上的砂子落入斗内时不改变方向。该漏斗的作用是保证直接落入口内的沙子不偏离地，尽可能垂直地冲击突起路标，而落到口外的沙子被偏离到斗外，不能冲击突起路标。校正漏斗应能上下，左右，前后移动，方便调整通过漏斗的砂量和均匀性。

◆过滤网：过滤网位于导砂管的上部，网孔尺寸为大于850UM的标准网。该过网的作用一是确立落砂的起始点，二是限制落砂的流速。要求落砂离网的距离不应大于30MM。

◆样品架：用于将被测样品夹持稳固，使样品的基底面保持垂直，方便地将样品与导砂管，校正漏斗对中，能自由调整被测样品的高度使其上边沿与漏斗上口保持不大于150MM，并能调整水平方向使样品逆反射面底边前沿与漏斗长边方向平行。样品架不应阻挡落砂的自由流动。

◆收集器：可用1只300MM×500MM的搪瓷托盘，或其他容器。为了防止落入校正漏斗的砂子溅出或外部的砂子溅入，可用与漏斗下口相同的软布罩将漏斗下口空间封围。

2. Test device composition:

◆The test device consists of a vertical sａnd guide pipe, a calibration funnel, a filter screen, a sample holder and a sａnd collector. Sａnd guide pipe: It can be composed of a solid-walled plastic pipe with an inner diameter of not less than 150MM and a smooth inner wall. The length is 2850MM. The non-verticality of the sａnd guide pipe is not more than 0.2°.

◆Calibration funnel: The upper mouth size of the calibration funnel is 120MM×40MM, the height is 100MM, and the four-sided slope angle is 45°. The four sides of the upper mouth should be straight and sharp to ensure that the sａnd falling on the edge of the mouth does not change its direction when it falls into the bucket. The function of the funnel is to ensure that the sａnd directly falling into the mouth does not deviate from the ground and hits the protruding road sign as vertically as possible, while the sａnd falling outside the mouth is deviated to the outside of the bucket and cannot hit the protruding road sign. The calibration funnel should be able to move up and down, left and right, and back and forth to facilitate adjustment of the amount and uniformity of sａnd passing through the funnel.

◆Filter mesh: The filter mesh is located on the upper part of the sａnd guide pipe, and the mesh size is a standard mesh larger than 850UM. The function of the net is to establish the starting point of falling sand, and the other is to limit the flow rate of falling sand. It is required that the distance between falling sａnd and the net should not be greater than 30mm.

◆Sample rack: It is used to hold the tested sample firmly, keep the base surface of the sample vertical, and conveniently center the sample with the sａnd guide tube and the calibration funnel. The height of the tested sample can be adjusted freely to make the upper edge of the funnel and the funnel. Keep the upper mouth no larger than 150mm, and adjust the horizontal direction so that the front edge of the bottom edge of the sample retroreflective surface is parallel to the long side of the funnel. The sample holder should not block the free flow of falling sand.

◆ Collector: 1 300MM×500MM enamel tray or other containers can be used. In order to prevent the sａnd falling into the calibration funnel from splashing or external sａnd from splashing in, the lower mouth space of the funnel can be enclosed by the same soft cloth cover as the lower mouth of the funnel.

三、试验步骤：

◆将设备和被测样品安装调整到位，并保证导砂管上部至被测样品底面上边沿的距离为3.00M±0.03M。

◆取足够用的试验用砂，以0.4KG/MIN―1.0KG/MIN的速度均匀落入导砂管上部的过滤网上，注意观察落砂冲击样品的均匀性和部位，并经常按照B.6的方法校准试验装置的均匀性。

◆收集通过校正漏斗的砂子并称重，称重的砂子包括撞击到样品及样品架上溅射到外部的砂子，但不含没有通过漏斗的部分，当发现收集的砂量不满足2.5KG±0.050KG要求时，应按照B.6的方法对试验装置进行校准。

◆取下被测样品，用软布清洁后，测量被冲击逆反射面的发光强度系数。

◆将用过的试验砂弃掉，试验用砂每个试验只用1次，不应重复使用。

◆测试装置校准

落砂应均匀地通过校正漏斗，其均匀性通过在漏斗下突起路标的位置和高度上放置至少10个口径约为10MM的小瓶来验证。当足够的沙子下落通过漏斗时，至少有1个小瓶收集到至少5G的砂子，收集最少的小瓶中沙子重量至少达到收集最多的小瓶中沙子重量的75％为测试装置合格。在确定装置的流动稳定性之后，视需要通过调整漏斗的上下和总用砂量来校准其均匀性和通过漏斗的砂量。

◆ 测试装置的修正

当被测突起路标底边大于100MM时应对整个装置进行修正，假设被测突起路标底边为（100+X）MM,则修正内容如下：

校正漏斗的上口长边为（120+X）MM;

导砂管的内径应至少（150+X）MM;

c) 通过校正漏斗的试验砂的质量应为(2.5+0.020 8X)KG,允差±2％;

d) 通过漏斗落砂的流速应保持在（0.4+X/300）KG/MIN―(1+X/120)KG/MIN

3. Test steps:

◆Install and adjust the equipment and the tested sample in place, and ensure that the distance from the top of the sａnd guide pipe to the edge of the bottom of the tested sample is 3.00M±0.03M.

◆Take enough test sａnd and drop it evenly on the filter screen on the upper part of the sａnd guide tube at a speed of 0.4KG/MIN-1.0KG/MIN. Pay attention to the uniformity and position of the sample impacted by the falling sand, and always follow B.6 The method to calibrate the uniformity of the test device.

◆Collect and weigh the sａnd that has passed the calibration funnel. The weighed sａnd includes the sａnd that hits the sample and the sample holder is splashed to the outside, but does not include the part that has not passed through the funnel. When it is found that the amount of sａnd collected does not meet 2.5KG± When 0.050KG is required, the test device should be calibrated in accordance with the method in B.6.

◆Remove the tested sample, clean it with a soft cloth, and measure the luminous intensity coefficient of the impacted retroreflective surface.

◆Discard the used test sand. The test sａnd should only be used once for each test and should not be reused.

◆Test device calibration

The falling sａnd should pass through the calibration funnel uniformly, and its uniformity is verified by placing at least 10 vials with a diameter of about 10MM at the position and height of the protruding road signs under the funnel. When enough sａnd falls through the funnel, at least one vial collects at least 5G of sand, and the weight of the sａnd in the least collected vial reaches at least 75% of the weight of the sａnd in the most collected vial to qualify the test device. After determining the flow stability of the device, adjust its uniformity and the amount of sａnd passing through the funnel by adjusting the top and bottom of the funnel and the total amount of sａnd as needed.

◆ Modification of test equipment

When the bottom side of the measured raised road sign is greater than 100MM, the entire device should be corrected. Assuming that the bottom side of the measured raised road sign is (100+X)MM, the correction content is as follows:

The long side of the upper mouth of the correction funnel is (120+X) MM;

The inner diameter of the sａnd guide pipe should be at least (150+X) MM;

c) The quality of the test sａnd passing the calibration funnel should be (2.5+0.020 8X) KG, with a tolerance of ± 2%;

d) The flow rate of sａnd falling through the funnel should be maintained at (0.4+X/300)KG/MIN―(1+X/120)KG/MIN

四、注意事项：

◆试验环境

温度23°C± 2°C,相对湿度（50±25）％。

◆测试用砂

试验用砂应使用二氧化硅含量的天然石英砂。

这种石英砂的颗粒分布应该满足如下要求：在经过10MIN的联系摇筛之后，不超过总量的10％保留在20号筛（850UM）上，不超过总重的10％漏过30号筛（600UM）.

注：在ASTM D 4280-2004中使用位于美国中部St,Peters或Jordan的砂岩沈积砂。

Four, matters needing attention:

◆Test environment

Temperature 23°C± 2°C, relative humidity (50±25)%.

◆Sａnd for testing

The test sａnd should use natural quartz sａnd with extremely high silica content.

The particle distribution of this kind of quartz sａnd should meet the following requirements: after 10 MIN, no more than 10% of the total weight is retained on the No. 20 sieve (850 UM), and no more than 10% of the total weight is passed through the No. 30 sieve. (600UM).

Note: ASTM D 4280-2004 specifies the use of sandstone sedimentary sａnd located in St, Peters or Jordan in the central United States.