CBR PLUS North America Inc.

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Client:

Village of Di-Gang
Wuhu City - Anhui Province - Peoples Republic of China

Location:

Rural Roads

Road:

Unpaved Road. Heavy Clay Soils.

Problem:

Rutting and wash boarding due to base failure — very dusty with road failures during rain — resulting in high maintenance and poor trafficability.

Soil Type:

Heavy Silty Clay AASHTO Classification A-7-6

Sieve Analysis	% passing	#40 mesh	96.7
	% passing	#60 mesh	90.1
	% passing	#200 mesh	87.3

Liquid Limit	40
Plastic Index	24

Application Rate:

0,012 liter/m2 CBR PLUS Classic

Treatment Objectives:

Increase the strength or bearing capacity of the base layer
Reduce the weakening of base layer due to moisture — particularly in the rainy period
Improve trafficability and reduce maintenance

Equipment:

1 Front End Loader
1 Water Tankers
1 Vibratory Drum Roller Compactor
3 Two Wheel Rotary Tillers

Construction Method:

The quality of the in situ soil was poor and as such was not treatable with CBR PLUS so a decision was made to bring in about 6 inches of silty clay soil which showed a very high reactivity with CBR PLUS, to cap the existing road structure. This soil was spread in a 15 cm layer on top of the existing base.

The CBR PLUS was then applied in a mixture of 200 : 1 parts water to CBR PLUS. Numerous application of this CBR PLUS / Water Mixture and then pure water without product was applied, until the top 150 mm had been treated, mixed, and had reached optimum moisture content. The layer was then mixed well by means of the rotary tillers. Using manual labour, the top 75mm was shaped into the road profile and compacted. After final shaping, the surface was finished with the vibratory smooth drum roller.

A thin layer of gravel was added onto the surface to provide a less slippery and more suitable riding surface. This section was once again compacted with the compactor.

After completion the top layer was sprayed once a day for a week to cure the top and allow the layer to dry out evenly.

Result:

The resultant road finished in a smooth surface with a fine gravel making up the surface. A smooth road surface that provides an excellent ride.


Untreated road - September, 2001		Treated road - September, 2001

December, 2001

May, 2002		May, 2002

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