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Scanning application of ACT in 8-inch concrete slab
Release time: 2018-06-23

检验超声波 混凝土厚度测试仪 ACT )探测 缺陷 的能力 ,我们 制作了一块含有 分层和空洞 的混凝土板(见 1 2 3 所示)。 To test the ability of the ultrasonic concrete thickness tester ( ACT ) to detect defects , we made a concrete slab containing layers and voids (see Figures 1 , 2 and 3 ). 60 ”( 英寸 ) ,宽 120 厚度 分别 8 4 The board is 60 "( inches ) long, 120 " wide , and 8 " and 4 " thick , respectively . The slabs are built on excavated dense clay paved with a layer of crushed limestone as the base and reinforced with steel bars. 石灰石上 铺设了一层 12 ´ 24 大小的 3/4” 厚的泡沫薄片 ,及一层 24 ´ 24 大小的 1” 厚的 鹅卵石 层。 A layer of 12 " ´ 24 " 3/4 " thick foam sheet and a layer of 24 " ´ 24 " 1" thick cobblestone were laid on the limestone .

        8” 厚的那部分板中。通过布设 1/32” 厚的三元乙丙 (EPDM) 橡胶薄片来产生分层。 Defects are only placed in the 8 " thick part of the board. Delamination is created by laying 1/32" thick EPDM rubber sheets. 3 12 ´ 12 大小的分层分别设置在 2 ,1/2” 1-1/2” 深处,另外 2 6 ´ 6 大小的分层分别设置在 1 4 深处。通过使用 3-1/8” ´ 3-1/8” ´ 23 大小的密封塑料管来产生空洞,密封塑料管顶面置于 4 - 1/2” 深的地方。而在鹅卵石基层上 5 深的地方还布置了一块 12 ´ 12 ´ 1/4” 大小的钢板,另外该混凝土板还包有一个大小 24 ´ 24 的由水泥浆和鳞片石构成的蜂窝缺陷。 Three 12 " ´12 " size layers are set at 2 " , 1/2" and 1-1 / 2 " depths, and two 6 " ´6 " size layers are set at 1 " and 4 deep. The cavity is created by using a sealed plastic tube 3-1 / 8” ´ 3-1 / 8 ” ´ 23 . The top surface of the sealed plastic tube is placed 4-1/ 2 " deep. A 12 ´ 12 ´ 1/4 ” steel plate was also placed 5 deep on the cobblestone basement. In addition, the concrete slab also contained a size 24 ´ 24 made of cement slurry and scaly stone. Honeycomb defect.

: Test steps :

、用 ACT 对该混凝土路面进行了扫描得到 1121 个数据,在 XY 坐标系统上建立间距为 2” (ΔX = ΔY = 2”) 1. The concrete pavement was scanned with ACT to obtain 1121 data, and the distance was established on the XY coordinate system as 2 ” (ΔX = ΔY = 2”) X 坐标点范围从 2-118 Y 坐标点范围从 2-58 ,如图 4 所示 . 在每个数据点,得到一个 2-30KHz 范围内的主频(共振频率峰值)。 Gray scale pattern, X coordinate point range is 2-118 , Y coordinate point range is 2-58 , as shown in Figure 4. At each data point, a main frequency (resonance frequency peak) in the range of 2-30KHz is obtained . .

、为便于数据采集和扫描报告生成 , 对每一个 Y 坐标点(上诸如 2, 4, ... 58 )创建 1 个记录名。 2. To facilitate data collection and scan report generation , create a record name for each Y coordinate point (such as 2, 4, ... , 58 ) . X 坐标点处采集得到一个数据。 For each record name, one data is collected at each X coordinate point. This data collection method can optimize the generation of scan results. EXCEL 电子表格显示和分析 , 得到主频形成的相对应图像,结果如图 5 所示,其中灰色区域是与 8” 厚度区域共振频率相对应的,而蓝色区域是与 4” 厚度区域共振频率相对应的。 By displaying and analyzing the Microsoft Excel spreadsheet , the corresponding image formed by the main frequency is obtained. The result is shown in Figure 5 , where the gray area corresponds to the resonance frequency of the 8 ” thickness area and the blue area corresponds to the 4” thickness area The resonance frequency corresponds.

Test Results:
8” 4” 厚的混凝土板相一致。 The test results show that where there are no defects, the results corresponding to the main frequency (thickness resonance) are consistent with 8 ” and 4” thick concrete slabs. In areas with delamination and voids, the dominant frequency changes from thickness resonance to bending resonance. Compared with the thickness resonance frequency, the frequency of the bending resonance is very sharp and low frequency. In the foam base region, the main frequency result corresponds to the reduction in thickness. In the cobblestone base and the honeycomb region, the obtained main frequency is very close to the thickness resonance frequency. Due to the use of a wet concrete mix, it is believed that the simulated honeycomb does not work and the concrete can easily flow around the cobblestone to make the stone a part of the concrete slab. ACT 检测缺陷的能力和准确性(见图 6 )。 The overlay of defect locations and scan results clearly demonstrates ACT 's ability and accuracy to detect defects (see Figure 6 ).

1. 8” 4” 深的部分 Figure 1. 8 ” to 4” deep

2 8” 深处有缺陷、砂砾和泡沫基底 Figure 2 Defective, gravel and foam substrates in the 8 " depth



3 混凝土板构造分布图 Figure 3 Structural distribution of concrete slabs


4. 2” 测试间隔分布测点的混凝土板 Figure 4. Concrete slabs with measuring points distributed at 2 ” test intervals


5 ACT 扫描混凝土板得到的数据绘制的 EXCEL Figure 5 EXCEL chart drawn from the data obtained by scanning the concrete slab with ACT

6 缺陷位置和扫描结果叠加图 Figure 6 Overlay of defect location and scan results


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