1.0 Brief introduction

Cracks will occur on roadway, bridge, tunnel, dam and other building because building aging (efflorescence, ultraviolet radiation, acid rain action), inappropriate design, improper material usage when changing load, bad construction, asymmetric sinking of base, earthquake, fire etc.
Influence that cracks cause to building is important. With time passing and because of harmful substance inrushing, cracks enlarge and become bad gradually. Then, building' performance of usage will play down and life of service will shorten, Even it will cause collapse of building, and become unsafe.

1.1 Influence that cracks cause to building

Influence that cracks cause to building is divided up five aspects:

1. Influence that cracks cause to rigidity of whole structure
When cracks appear, structure rigidity, shear strength, tension strength and moment strength will lack. Stress will be distributed again, and destroy continually even members will collapse.

2. Rigidity of concrete decrease
Cracks make available section of member damage and stiffness of section lack, so, flection of member increase and the probability of shake failure will enhance. At one time, because structure rigidity reduce, stress will be distributed again that make cracks enlarge and develop continually. When cracks run through members, section rigidity of concrete will be out of action and steel bars will support all loads, and members are in the danger of collapse.

3.Strength of steel bars decrease
Cracks make strength of steel bars decrease, and besides, they make steel bars rust, hydrogenate and embrittle, and decrease grasp force between steel bars and concrete, decrease tension strength of steel bars too. Hydrogenation and embritlement can make ductibility of bars lower and bars have a tendence to be similar with to brittle material, so, it is dangerous that there is a warning before members failure.

4.Water-seal performance reducing
As a result of water-seal performance' falling quickly, acid and alkali stuff corrade into concrete member that make steel bars rust quickly and make concrete acid. So building will be damaged highly.

5.Influence that cracks cause to permanence
Influence that cracks cause to permanence is mainly to make concrete acid quickly and make steel bars rust quickly, and decorated layer and protected layer flake off because concrete have gone moldy by leaking and seeping, then, life of building will become short. So, in order to hold out safety and life of building, we must repair cracks. Reference to standard of Occident, Japan (the below list)

ACI Standard in terms of permanence:

The maximal width of cracks allowed according to demand of perdurability

[AC1224COMMITTEE]

As for structure reinforcement that is operated after repair is not referred in this text.

2.High-pressure injecting method
We should inject material into members with high pressure (20mpa ~ 40mpa) in limited time. The method is suitable to continual wall of the underground, and we may use various materials according to spots.

3.V-Cut cracks repair method
Cut a hole or a V-groove with diamond cut-machine; then, fill it up with elastic paint or epoxy resin; finally, cover the work surface with glass fiber or elastic paint. The method often is used in brick wall，cellularity concrete and dry-shrinking cracks between partition and concrete.

2.0 Introduction on our products series

This chapter' content includes AE150 continual compressive injecting system, AS2000 high-pressure injecting system and V-Cut surface repair system.

2.1 Products series on injecting method of A&GOOD AE150

AE111, AE160, AE150, AE151, AE152, AE153, AC810, AC100

2.1.1 Concrete Adhesive（Sealant）AE111AB (N)Normal (F) Fast Dry

Advantage：

• High adhibition strength --Have a good bond to materials except for PVC
• High strength -- about 5600psi in 8 hours
• No drooping -- can be used on the vertical plane or fall plane

2.1.2 Crack Injection Resin AE160AB
Appropriate to general concrete structure where cracks is not more than 1.5mm.

Advantage:

• Non-shrinking-no chap like cement shrinking
• Well fluidity-can be applied to any cracks and little hole
• Changeless packaging，used conveniently anywhere and anytime
• Low or high pressure injecting method are all able to be well applied
• High adhibition strength
• High strength
• Water-repellent，good permanence，to protect steel bars from corrading

2.1.3 Dual axes continual-pressure injector AE150

AE150 repair method is the best method to repair cracks with injector among all methods of cracks repair in important structures. Its advantages are stated:

• Reagent is filled up well according to graduation against waste of reagent
• Press well, and press according to design with AE153
• The dosage injected can be measure accurately for being checked up
• Replacing injectors easily
• The process of pressing is easy to operate, and only need to hang AE153
• Continual pressure make reagent go deep into minute cracks, and have no fake saturation
• The injecting pressure is lower than concrete strength, and don't damage building again.

2.1.4 Dual axes continual-pressure injector base AE151

Used in common concrete plane for cracks injecting.

2.1.5 Dual axes continual-pressure injector right-angle base AE152

Used in common concrete vertical angle for cracks injecting.

2.1.6 Dual axes continual-pressure injector rubber band AE153 for pressing

Used for dual axes continual-pressure injector AE150, it has a strength of 0.5kg/cm2／bar when it is pulled to 16cm that is the length between two hooks of injector when reagent was filled 30ml.

2.1.7 Super- particulate non-shrinking cement AC810

Used in common concrete when the width of cracks is more than 1.5mm.
It is difficult to go deep into thin-sand layer whose infiltration coefficient is lower than 5×10cm/s to common cement slurry, and can't go deep into cracks whose width is lower than 0.2mm too, because the diameter of common cement granule is between 40μm and 100μm.

The diameter of 50% super-particulate cement granule is between 4μm and 6μm, and the biggest is 30μm, and compare-surface area is 8000cm2/g. They are much smaller than common cement' diameter, so, super-particulate cement can be injected well into small cracks whose infiltration coefficient is 10-3~10-4cm/s.

2.1.8 general non-shrinking cement（pre-mixed）AC100

To be apt for repairing cracks of brick and porous structure.

2.2 Products series on high-pressure injecting method of A&GOOD AS2000

AS200, AS185, AS155, AS156, AS157, AS158

2.2.1 high-pressure injector AS200

Operate it with electric drill with high torsion and low rotate speed(750W,280∼650r.p.m), and have a injecting pressure of 6000psi.
So, it is propitious to inject resin into structure quickly, and the effect is different if injection is different.

2.2.2 High-pressure stop control injector pinhead AS185

Fix AS185 hardly in the hole after completed drilling, then, connect AS186 and high-pressure pipe AS200. Resin is control to can't backwash because of stop-backwash installation.

2.2.3 Resin of AS155, AS156, AS157 and AS158 for injecting

Table on applications of AS155,AS156,AS157 and AS158.

Table on performance of AS155, AS156, AS157 and AS158.