Constant Slope Barrier – Technical Specification Guide

Standard Dimensions

Parameter	Measurement	Tolerance	Purpose
Height	810mm	±10mm	Vehicle containment
Base Width	570mm	±5mm	Stability
Top Width	180mm	±5mm	Impact surface
Length	3050mm	±15mm	Standard unit
Face Slope	79° (constant)	±1°	Vehicle redirect
Weight	2.2 tonnes	±0.1t	Unit mass
Drainage Slot	100x100mm	±5mm	Water flow

Design Features

Feature	Specification	Benefit	Performance
Single Slope	79° continuous	Predictable impact	Consistent redirection
No Snag Points	Smooth profile	Reduced vehicle damage	Enhanced safety
Continuous Base	Full contact	Stable foundation	Better load distribution
Symmetrical Design	Both sides equal	Bi-directional use	Installation flexibility
Integral Drainage	Through-slots	Water management	Reduced ponding

Performance Ratings

Test Level	Vehicle Type	Mass (kg)	Speed (km/h)	Impact Angle (°)
TL-4	Single Unit Truck	8,000	80	15
TL-4	Pickup Truck	2,270	100	25
TL-4	Passenger Car	1,100	100	25
TL-3	Pickup Truck	2,270	100	25
TL-2	Passenger Car	1,100	70	25

Material Requirements

Component	Specification	Strength	Standard
Concrete	Class 40/50	40 MPa	ASTM C31
Primary Rebar	#5 (16mm)	Grade 60	ASTM A615
Stirrups	#4 (13mm)	Grade 60	ASTM A615
Connection Steel	Grade 50	350 MPa	ASTM A36
Lifting Points	Grade 50	350 MPa	ASTM A36

Installation Parameters

Parameter	Requirement	Tolerance	Verification
Foundation	150mm Type 1	±25mm	Compaction test
Alignment	String line	±15mm	Survey check
Grade	Design level	±10mm	Level survey
Joint Width	15mm	+5mm/-0mm	Gap measure
Anchoring	As specified	±5mm	Template check

Connection Systems

Type	Components	Rating	Application
Pin & Loop	32mm pin	TL-4	Permanent
Plate Connection	200x200mm	TL-4	Structure mount
Quick Release	Drop pin	TL-3	Temporary
Bridge Mount	Anchor bolt	TL-4	Bridge transition
End Terminal	Impact head	TL-3	Terminal section

Maintenance Schedule

Activity	Frequency	Scope	Action Required
Visual Inspection	Monthly	Surface condition	Document/Repair
Joint Check	Quarterly	Connection integrity	Adjust/Replace
Level Survey	Annually	Position verification	Realign if needed
Impact Inspection	Post-incident	Damage assessment	Replace if needed
Drainage Check	Monthly	Clear slots	Clean/Maintain

Repair Criteria

Damage Type	Assessment	Action	Timeline
Surface Spall	<50mm deep	Patch repair	1 month
Deep Spall	>50mm deep	Unit replacement	1 week
Cracking	>0.3mm width	Epoxy injection	2 weeks
Joint Damage	Any	Replace hardware	24 hours
Misalignment	>25mm	Realignment	1 week