Abrasion resistance and microstructure of road concrete
under different design parameters(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年06期
- Page:
- 1-11
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Abrasion resistance and microstructure of road concrete
under different design parameters
- Author(s):
- GUO Yinchuan; SHEN Aiqin; ZHAI Chaowei; LI Peng
- (1. School of Highway， Changan University， Xian 710064， Shaanxi， China； 2. Louisiana Transportation Research Center, Louisiana State University, Baton Rouge LA70803, Louisiana, USA;3. Henan Provincial Communications Planning & Design Institute Co. Ltd， Zhengzhou 451464， Henan， China)
- Keywords:
- road engineering; abrasion resistance; mercury intrusion porosimetry; mortar volume component; microstructure; correlation
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the correlations between the microstructure and abrasion resistance of concrete pavement, the influence of mortar layer on the abrasion resistance of concrete pavement was considered, and the mortar volume component was used as an important design parameter for the abrasion resistance of concrete pavement, the compressive strength test and abrasion resistance test were used for the concrete pavement with different mortar volume components and watercement ratios, in addition, the digital image processing technology, mercury intrusion porosimetry and scanning electron microscope have been used to study the change laws of the stomatal structure, pore structure and micro topography under different design parameters, and the correlations between microstructure and abrasion resistance of road concrete have been analyzed. The results show that the compressive strength of road concrete improves with the increase of the mortar volume component or the decrease of watercement ratio, and the abrasion resistance of road concrete improves with the increase of mortar volume component or the reduction of watercement ratio, and the effect of mortar volume component on abrasion resistance is more significant. When the mortar volume component increases from 0.52 to 0.58, the compressive strength of road concrete improves by 23% and the abrasion resistance increases by 50%. When the watercement ratio decreases from 0.46 to 0.40, the compressive strength of road concrete improves by 21% and the abrasion resistance increases by 41%. With the increase of the mortar volume component and the decrease of watercement ratio, the parameters of stomatal structure and pore structure of concrete reduce gradually, and the percentage of <100 nm pores increases, so the microstructure of concrete improves and internal structure of concrete tends to be dense, which is conducive to enhance the abrasion resistance of road concrete. The correlations between abrasion value and stomatal structure is different from that between abrasion value and pore structure. Further, the abrasion resistance has strongest correlations with the average stomatal size, followed by the correlations with the stomatal spacing coefficient, and has weak correlations with the total stomatal rate. However, the abrasion value has the strongest correlations with the percentage of 50 to 100 nm pores, followed by the characteristic parameters of each pore structure, and has weak correlations with the percentage of >200 nm pores.
Last Update: 2019-12-19