Reinforcement Pu Wei highway bridge with carbon fiber fabric

The main technology is to use epoxy mortar to repair the exposed reinforcement and concrete defects in the beam body. The advanced carbon fiber reinforcement technology is applied to reinforce the above highway bridges so as to improve the bearing capacity and durability of the bridge structure.

Project overview

The former canal and provincial highway have been undertaking heavier transportation tasks. In recent years, the traffic volume is increasing. Higher requirements for the safe operation of the provincial roads are put forward. After years of operation, in the bridge inspection process, found that the Pu Wei highway bridge (part of Pu Wei Longquan port, port, port battle Maqiao bridge) portion of the slab beam fine crack obviously, considering the safety of the bridge structure,district highway department to arrange the cracks of plate beam by carbon fiber reinforcement reinforcement plan. The main technology is to use epoxy mortar to repair the exposed reinforcement and concrete defects in the beam body. The advanced carbon fiber reinforcement technology is applied to reinforce the above highway bridges so as to improve the bearing capacity and durability of the bridge structure.

highway bridge with carbon fiber reinforced polymer

（highway bridge with carbon fiber reinforced polymer CFRP fabric）

Engineering scope

The maintenance and reinforcement project of Longquan port, the main battle of Hong Kong, Hong Kong, bridge 3 bridge maintenance construction, advanced line qiaokong scaffording, then the existence of cracks in the beam reinforced with carbon fiber, so as to improve the bearing capacity and durability of bridge structure.

Construction period

The total schedule of the plan is about 28 days.

Plan start date: the scheduled completion date of 10 06 month 2011: 07 month, 7, 2011

Main workload of unit engineering

Externally bonded carbon fiber reinfroced polymer(cfrp) at the bottom of the beam, combined with 162.00m2

Structural strengthening materials

HM-30 unidirectional carbon fiber fabric

HM-180C3P carbon fiber adhesive

highway bridge with carbon fiber reinforced polymer

Carbon Fiber fabric and carbon fiber adhesive's datasheet

Dry Fiber Typical Properties
Standrad Value of Tensile Strength	4900MPa(7.1×105psi)
Tensile Elastic Modulus	234500MPa(34×105psi)
Elongation	1.7%

Laminate Fiber Typical Properties
Standrad Value of Tensile Strength	3800MPa(5.51×105psi)
Tensile Elastic Modulus	234500MPa(34×105psi)
Elongation	1.7%
With Concrete	Concrete Damaged: ≥2.5MPa
Densiy	1.8g/cc(0.065lbs.in3）
	HM-30	0.167mm(0.0065in.)

The properties after carbon fiber adhesive
Colloidal performance	Compressive strength(MPa)	≥70.0	Working performance	Nonvertical mobility(mm), 30℃	2.0
	Tensile strength(MPa)	≥40.0		Operable time(min), 30℃	＞40
	Bending Strength(MPa)	≥50.0		Applicable Temperature(℃)	5～40
	Elastic strength(MPa)	≥2500
Bonding capacity	Steel-steel tensile shear strength(MPa)	≥14	Mixing ratio		A:B=2:1
	Pulling bonding strength along with concrete(MPa)	≥2.5	Curing time(d),25℃		3～7
	Steel-concrete tensile	C60 concrete damage