GRAVEL ROADS Road Material Stabilisers (Pty) Ltd COMPANY PROFILE - - PowerPoint PPT Presentation
ALTERNATIVE METHODS TOWARDS THE IMPROVEMENT OF GRAVEL ROADS Road Material Stabilisers (Pty) Ltd COMPANY PROFILE Road Material Stabilizers (Pty) Ltd Products Services Technical support Road surfacing Soil stabilizers and binders Dust
(Pty) Ltd
Technical support Products Road surfacing Trafficked surfaces Un-trafficked surfaces Services Soil stabilizers and binders Dust suppression Surfaced roads Gravel / Dirt roads
Road Material Stabilizers
(Pty) Ltd
Key requirements of additives:-
Improved riding quality Reduce defects; gravel loss; corrugations; potholes; mud etc. Wet season - improved resistance to water erosion Dry season – reduction in dust levels Reduction in the required maintenance Gravel preservation
Cohesive materials Good grading Non-cohesive materials Poorly graded Soils stabilisers Binders (also function as dust palliatives)
PRODUCT CATEGORIES
Soil Stabilisers: Wetting Agents Enzyme Products Electrochemical / Sulphonated Petroleum Calcium Chloride
Binders: UF Resins Synthetic Emulsified Polymers Lignosulphonates Petrolium Resins Bitumen Emulsions
PRODUCT SELECTION MATRIX
PARAMETER/ PRODUCT High PI materials (PI >10) Medium PI materials (PI 3 - 10) Sandy materials (PI < 3) Short term applications (deviations) Long term applications* (maintenance progs) Spray-on application Mix-in application Grader maintenance Wetting agents
x x x x x x x
Enzymes
x x x x x x
Electrochemical
x x
Calcium Chloride
x x x x x x x
UF Resins
x x x x x x
Synthetic polymers
x x x x x x
Lignosulphonate
x x x x x x x
Petroleum resins
x x x x x
Bitumen Emulsions
x x x x x x
Economical construction method for use in gravel and surfaced roads Increase in compacted densities and bearing capacities Greater use of in-situ material No specialised equipment required Treatment with certain products is permanent Roads can be opened to traffic immediately
Electrochemical Stabiliser
CSIR Report: DPVT –C83.5 (Prepared for Department of Development Aid)
THE EVALUATION OF EROSION PROTECTION MEASURES FOR ROADS IN FULL SCALE EXPERIMENTS
Control SPP Gravel Loss
14 — 22 4 — 7
Month CBR %M CBR %M 1
38 8.1 41 8.0
3
66 4.4 85 4.1
4
63 4.4 >200 4.0
57 3.8 >200 3.0 Site conditions:
VPD 200 Rainfall 750 — 900 mm Slope 0 — 20% Materials Sandstone, shale, Laterite
Water-based (mixes in with compaction water) Suitable for application to a wide variety of soil types No specialised equipment required Minimal disruption to traffic Reduces erodibility and improves waterproofing of unsurfaced roads Increases CBR and UCS significantly
Emulsified Polymer
CSIR TANSPORTEK
SASBIND application rate (%) Mass loss on brushing (%) None 0.2 0.4 0.6 1 35 16.9 7.7 6.1 3.7 SASBIND application rate (%) None 0.7 CBR (%) 62.2 50.2 46.5 140.9 121.4 86.9 Avg CBR 53.0 116.4 SASBIND application rate (%) None 0.7 Mass loss (%) 2.3 3.2 0.4 0.3 Avg loss 2.8 0.4 Water Erodibility California Bearing Ratio Results Abrasion Resistance REPORT ON THE TESTING OF SASBIND STABILSER
Reduced gravel loss and dust levels and road maintenance Suitable for use with a variety of materials with compositions and characteristics Easy to apply, no specialised equipment required Minimal disruption to traffic, roads can be trafficked immediately Environmentally friendly, non-toxic and non-hazardous
Calcium Lignosulphonate
CSIR Report: DPVT –C83.5 (Prepared for Department of Development Aid)
INITIAL LABORATORY INVESTIGATION ON THE USE OF DUSTEX AND CA-SA AS ROAD ADDITIVES
Material % Improvement in resistance Dustex 0.5% Granite 98.9 Diabase 12.5 Ferricrete 84.6 Calcrete 60.0 Chert 68.8 Shale 75.0 Sand 97.1 Material % Reduction in P0.075 Dustex 0.5% Granite 43 Diabase 87 Ferricrete 22 Calcrete 42 Chert 71 Shale 82 Sand 41
Abrasion Resistance Dust prevention