Laboratory evaluation of a biodegradable surfactant for In Situ soil flushing

Growing economy and increasing pollution evoke the need for more environmentally friendly road construction techniques and the saving of natural resources. In this context, cold recycling plays an important role since, on the one hand, it allows to reduce CO2 emissions drastically and, on the other hand, it offers a variety of opportunities for high percentages of recycling. Inspired by experience in Sweden, the international project “Optimal Recycling of Reclaimed Asphalts for low-traffic Pavement” (ORRAP) for low-volume roads in the Upper Rhine region aims to develop and establish a new strategy for 100% reclaimed asphalt pavement (RAP) at ambient temperature (20°C) without adding virgin bituminous binders or rejuvenators. The still ongoing research project involves laboratory experiments as well as in situ test sections. The link between small-scale laboratory experiments and in situ testing is provided by medium-scale traffic simulation in the laboratory. This paper describes results from medium-scale compaction in the laboratory using different methods as well as traffic simulation with a medium-scale mobile traffic load simulator. The results show that compaction in the laboratory at ambient temperature (20°) is very difficult to achieve. Nevertheless, it was found that compaction at a temperature of 60°C appears possible and provides promising results regarding stability and rutting enabling the in situ construction. The in situ pavement construction at ambient temperature on a low-volume road in Switzerland resulted in a visibly well-compacted and stable base course which was covered by a hot mix asphalt surface course the day after. The test section will be monitored closely over the next 12 months.

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Laboratory evaluation of selective in situ refractive cornea collagen shrinkage with continuous wave infrared laser combined with transepithelial collagen cross-linking: a novel refractive procedure

Clinical Ophthalmology ◽

10.2147/opth.s31250 ◽

2012 ◽

pp. 645 ◽

Cited By ~ 4

Author(s):

John Kanellopoulos

Keyword(s):

Continuous Wave ◽

Infrared Laser ◽

Laboratory Evaluation ◽

Cross Linking ◽

Collagen Cross Linking

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Field Application of Modified In Situ Soil Flushing in Combination with Air Sparging at a Military Site Polluted by Diesel and Gasoline in Korea

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph110908806 ◽

2014 ◽

Vol 11 (9) ◽

pp. 8806-8824 ◽

Cited By ~ 8

Author(s):

Hwan Lee ◽

Yoonjin Lee ◽

Jaeyoung Kim ◽

Choltae Kim

Keyword(s):

Field Application ◽

Air Sparging ◽

Soil Flushing

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Laboratory evaluation of K0 for overconsolidated clays

Canadian Geotechnical Journal ◽

10.1139/t91-079 ◽

1991 ◽

Vol 28 (5) ◽

pp. 650-659 ◽

Cited By ~ 17

Author(s):

Vinod K. Garga ◽

Mahbubul A. Khan

Keyword(s):

Axial Stress ◽

Axial Strain ◽

Stress Path ◽

Horizontal Stress ◽

In Situ Stress ◽

Laboratory Method ◽

Laboratory Evaluation ◽

Triaxial Apparatus ◽

Overconsolidated Clays

Most of the laboratory testing methods available for the evaluation of in situ horizontal stresses are applicable to normally consolidated or lightly overconsolidated clays. This paper describes a new laboratory method for the determination of in situ horizontal stresses of heavily overconsolidated clays using a stress-path triaxial apparatus. The proposed method is based on the concept that if the radial stress exceeds the in situ horizontal stress, while maintaining the axial stress constant and equal to the in situ vertical effective stress, only then will the sample experience significant axial strain. The results obtained for undisturbed samples of an overconsolidated clay crust are found to be in agreement with some available methods. For verification of the applicability of the proposed method, K0 was determined for artificially prepared samples that had been subjected to known stress paths simulating field stress history. Key words: K0, overconsolidation, in situ stress, in situ test, clay crust, laboratory test.

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