Experimental on molding process for chipsprinklingcement concrete pavement(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年03期
- Page:
- 34-42
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Experimental on molding process for chipsprinklingcement concrete pavement
- Author(s):
- GAO Zhenxin; GUO Ping; LI Jun
- Keywords:
- -
- PACS:
- -
- DOI:
- -
- Abstract:
- Aimed at the relationship between the surface texture of chipsprinkling cement concrete and the pressingin effect of crushed aggregates, the key molding process parameters, including the pressingin time, pressingin depth, and pressingin load, which control the pressingin effect of crushed aggregates, were studied. The road material strength tester was used to simulate a laboratory molding process of chipsprinkling cement concrete, and the effects of different factors on the molding process parameters were analyzed. Three kinds of mixes, including cement concrete, cement mortar, and cement paste, were chosen. Moreover, pressingin loads were measured, respectively, under different pressingin conditions. The latest pressingin time of the crushed aggregates was recommended on the basis of the initial setting times of the cement concrete mix with different consistencies, and the effects of certain factors, such as concrete consistencies, aggregate particle sizes, aggregate spreading areas, and pressingin time, on pressingin loads, were analyzed under different pressingin depths. The appropriate molding process parameters of chipsprinkling cement concrete were recommended. The effect differences of different factors on the molding process parameters were analyzed by calculating appropriate ranges. The results show that the impeding effects of coarse aggregate in the cement concrete play a major role in pressingin load sources. Fine aggregate affects the friction characteristics of the contact interface between the crushed aggregate and cement concrete, and the friction resistance has a certain effect on pressingin load. The better the workability of cement concrete, the more easily implanted it is for crushed aggregates; however, crushed aggregates are easily entirely implanted if the workability is too large. The cement concrete with a plasticity consistency is recommended as the implanted layer material for chipsprinkling technology. The crushed aggregates of chipsprinkling technology should be single particle size. The pressingin loads positively correlate with the spreading area of the crushed aggregates. A spreading area that is too small could result in bad surface texture, and a spreading area that is too large could result in crushed aggregates falling off. The spreading area should be distributed within a range of 60% to 70%. A pressingin time that is too late could result in the plastic failure of the cement concrete, due to the gradual forming of early strength. The pressingin time should not exceed 75 ℃·h. Cement concrete consistency is the most prominent influence on molding process parameters for chipsprinkling cement concrete, followed by the effects of the crushed aggregate particle size and the pressing time. The crushed aggregate spreading area has a minimal impact on molding process parameters. 4 tabs, 9 figs, 27 refs.
Last Update: 2018-06-13