AFM(atomic force microscope)-based method for testing surface roughness of aggregate
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An atomic force microscope and surface roughness technology, applied in the field of construction, can solve problems such as errors, and achieve the effect of good accuracy, simple method and high stability
Inactive Publication Date: 2018-07-27
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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[0009] It is not very intuitive to use fractal theory to study the surface roughness of aggregates. The accuracy of this method is also very dependent on the accuracy of the analytical method used when converting the surface roughness curve into a characteristic roughness, no matter which method is used Integrating aggregate surface roughness curves will produce certain errors
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Embodiment 1
[0041] Embodiment 1: A method for testing aggregate surface roughness based on AFM mirror
[0042] The aggregate is limestone.
[0043]1) To prepare the AFM sample of limestone aggregate, cut the limestone into a 5cm x 5cm x 0.5cm thick specimen, and use sandpaper to polish it to eliminate the macroscopic texture caused by cutting. AFM samples of limestone aggregates see figure 1 .
[0044] 2) The Demension icon type AFM equipment from Bruker, Germany is used. The specifications of the AFM instrument are shown in Table 1, and the selected probe models and test parameters are shown in Tables 2 and 3.
[0045] Table 1 Demension icon type AFM instrument parameters
[0046]
[0047] Table 2 Probe Models and Parameters
[0048]
[0049] Table 3 AFM test parameters of aggregates
[0050]
[0051] 3) Topography of limestone aggregates, Figure 2~3 They are the two-dimensional topography map, phase map and three-dimensional topography map of limestone aggregates below 1...
Embodiment 2
[0067] Embodiment 2: A method for testing aggregate surface roughness based on AFM mirror
[0068] The aggregate is basalt.
[0069] 1) To prepare AFM samples of basalt aggregates, cut the basalt into 5cm x 5cm x 0.5cm thick specimens, and polish them with sandpaper to eliminate the macroscopic texture caused by cutting. For AFM samples of basalt aggregates see Figure 4 .
[0070] 2) Demension icon type AFM equipment from Bruker, Germany.
[0071] Instrument index is identical with embodiment 1.
[0072] 3) Topography of basalt aggregates, Figure 5-6 They are the two-dimensional topography map, phase map and three-dimensional topography map of basalt aggregates under 10 μm, respectively.
[0073] 4) Verify the effectiveness of basalt aggregate Ra, see Table 6.
[0074] Table 6 Ra of basalt
[0075]
[0076] 5) Discriminative verification. The independent sample t-test in SPSS is used to conduct discriminative verification of the surface roughness of basalt aggregat...
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Abstract
The invention relates to an AFM(atomic force microscope)-based method for testing the surface roughness of an aggregate. The method comprises the steps of 1) preparing an aggregate test piece; 2) testing the surface roughness of the aggregate in the tapping mode of the AFM; 3) exporting the three-dimensional coordinate information obtained during the test through Nanoescape Analysis; 4) carrying out the validity verification on the contour arithmetic mean deviation Ra of the surface roughness of the aggregate; 5) detecting the distinguishing performance of the surface roughness of the aggregate by adopting an independent sample t in SPSS software. According to the AFM(atomic force microscope)-based method for testing the surface roughness of the aggregate, the AFM is used as a main tool inthe nano technology research and is applied to the fields of new-generation microelectronic chips, optical systems, new materials, bioengineering and the like. In the prior art, less research is conducted on the AFM technology for testing the surface roughness of the aggregate, and the analysis of the surface roughness of the aggregate is very limited. For the research on the surface roughness ofthe aggregate, most of the researchers adopt the fractal theory.
Description
technical field [0001] The invention belongs to the technical field of construction and relates to a method for testing the surface roughness of aggregates based on an atomic force microscope Background technique [0002] In asphalt mixture, the shape and surface roughness of the aggregate have a very significant impact on the road performance of the mixture. The surface roughness of the aggregate is one of the main factors affecting the thickness of the asphalt film adsorbed by it. The greater the surface roughness of the aggregate, the thicker the asphalt film adsorbed, and the greater the bonding force between asphalt and aggregate. [0003] At present, in the research on aggregate surface roughness at home and abroad, most scholars adopt fractal theory. [0004] Chen Guoming used a laser profiler to measure the surface roughness curves of 9 different coarse aggregates, and used the characteristic roughness to comprehensively characterize the surface roughness of the coa...
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