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High friction surface treatment is one of the surface retention methods in which very high-quality aggregates are applied to the pavement along with polymer resin binders to maintain the pavement friction for the distressed pavements.
In general, the materials that are used for High friction surface treatment are hard and durable in nature, polished and abrasion-resistant. The components used for High friction surface treatment are described below.
The widely used aggregates for High friction surface treatment is calcined bauxite. As it is having very high skid resistance compared to other types it is high recommendable where the accidents are prone to happen. Other aggregates like basalt, granite and flint are also can be used for preventive maintenance where there is a low risk of accidents were present.
Recent studies are suggested using blast furnace slag as an alternative to these high friction surface treatments.
Numerous types of binders used for High friction surface treatment are Polymer resin binder, Epoxy-based binder, methyl methacrylate-based binder, polyester-based resins and polyurethane-based resin etc.
The basic function of these binders is to strongly hold the aggregate in its position by mixing with them. Traditional bitumen binders are relatively softer in nature when subjected to higher summer temperatures whereas these polymer binders having an advantage over them in this case.
These types of binders will have high durability and bond strength. They have a longer curing time compared to other types of binders and can be applied for temperatures lower than 600F.
These are having higher bond strength and moderate to high curing times depending on the additive used.
These are having moderate to higher bond strength and durability. May be applied at lower temperatures.
Materials procured for high friction surface treatment are mainly polymer resin binders and aggregates. Specifications for these materials are as follows. (2)
Polymer binder used for high friction surface treatment is having the following specifications: (2)
|Viscosity||ASTM D-2556||7-30 poises|
|Gel time||ASTM C-881||10 minutes min|
|Ultimate Tensile Strength||ASTM D-638||2500-5000 psi|
|Elongation at breakpoint||ASTM D-638||30-70%|
|Durometer hardness (Shore D)||ASTM D-2240||60-80|
|Compressive strength||ASTM C-579||
1000 psi min at 3hrs;
5000 psi min at 7 days
|The cure rate (Dry through time)||ASTM D-1640||3 hrs max|
|water absorption||ASTM D-570||1% max|
|Adhesive strength @24 hrs||ASTM C-1583||250 psi min or 100% substrate failure|
Specifications of Aggregates used for high friction surface treatment are as follows: (2)
|Aggregate Grading||No. 6 Percentage Passing 95% min. No.16 Percentage Passing 5% max.|
|Aggregate Abrasion Value Loss at 100 rev.||LA Abrasion ASTM C-131||10% max.|
|Aggregate Acid Insolubility||Tex-512-J||Greater than 90%|
|Aggregate Magnesium Soundness||Tex-411-A (Stockpile gradation)||30% max.|
|Aluminium Oxide Content||ASTM C-25||87% min|
High friction surface treatment can be applied to both flexible and rigid pavements.
High friction surface treatment technology addresses various onsite issues and is mainly used in the following:
Based on the adopted polymer binders and aggregates applied high friction surface treatment products are: Epoxy high friction surface treatment and Methyl methacrylate (MMA) High friction surface treatment. Both these types are very rapid in terms of curing and having high durability and bond strength.
Following are various other surface treatment techniques that serve as an alternative to high friction surface treatment. They are chip seal and/ or micro-surfacing.
I hope the blog provides you with adequate knowledge of High Friction Surface Treatment and its associated features. Please feel free to like, share and comment.
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(1)https://www.fdot.gov/docs/defaultsource/materials/pavement/performance/ndt/documents/hfstguidelines.pdf (2) https://ftp.txdot.gov/pub/txdot-info/cmd/cserve/specs/2014/spec/ss4013.pdf (3)https://safety.fhwa.dot.gov/roadway_dept/pavement_friction/high_friction/ (4) http://dot.state.mn.us/research/TRS/2018/TRS1802.pdf (5)https://www.fhwa.dot.gov/innovation/everydaycounts/edc-2/pdfs/fhwa-cai-14-019_faqs_hfst_mar2014_508.pdf
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