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Probase Technology Best Practice



Date: 7/5/205
Submitter’s Name: Meboh Atieno Abuor

Sector/Committee Name: Roads and Transport

County:  Meru County

Brief Description of the Practice:  Probase road construction technology
Probase is the method for soil road enhancement & maintenance. The technology is accomplished in three steps.  The first step is soil stabilization. The common methods of stabilizing soil include stabilization by compaction, mechanical stabilization or by the use of stabilizing additives like cement, lime, bitumen and many other stabilizers available in the market.

The second step involves waterproofing  and dust control. The stabilized soil surface is sealed with PROBASE PB-65 SOIL SEALANT to provide a waterproof layer to prevent rainwater penetration into the soil and keep the road in dry condition at all times.

The last step is maintenance. It is the patching any pothole or depression by mixing soil with TX-85, followed by sealing a layer of PB-65 SOIL SELANT on the affected area. Only minimal manpower is required comprising of 3 workers + 1 truck for a maintenance team. Maintenance can be done as and when required for a long lasting road.

Why the practice was used: The practice was used because it is cost effective, the materials are readily available, and fast.  It is in essence cheap, durable and easy to maintain.  The use of probase in Meru was a pilot case, which would be rolled out in other counties. The practice has since been adopted in Kiambu and benchmarked in Taita.
The main challenge addressed by this technology is increasing road network penetration in rural areas to open up for trade and investment.

 Benefits of the practice:
•    Affordable
•    Durable
•    Fast
•    Easy maintenance
•    Good visibility

Waterproof roads
Soil sealed with Proseal can effectively prevent water penetration compared to unsealed roads. This makes the constructed road durable.

Maintaining the roads strength

The non-water soluble layer of protection keeps the road dry. Test results show that the strength of the road is maintained even  during heavy downpour.

Erosion free

Rainwater and traffic can cause erosion of ± 75 mm per year without sealing. Proseal on the other hand prevents erosion; saving cost on resurfacing while protecting the environment.

Dust free

The protective layer of Proseal virtually turns the soil road into a dust-free environment.

Challenges associated with the practice:

Being a new concept, most contractors are reluctant to adopt probase technology.

How the success of the Practice was measured:

The success was measured in terms of:
•    Cost of construction
•    Speed of construction
•    Durability of constructed roads..

The COG Chairman

H E Nanok

His Excellency Josphat Koli Nanok,  Governor Turkana County and the Chairman of the Council of Governors.


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