| Title |
Author |
Description and Summary |
Links |
| CONCRETE CRACK AND PARTIAL DEPTH SPALL REPAIR |
U.S Department Of Defense |
This handbook contains information on current practices (as of September 1998) for the repair of cracks and spalls in concrete pavements as well as on the selection of materials and equipment. This handbook is intended for use as a field handbook for airfield concrete pavement repair for all U.S. Navy, Army, and Air Force facilities; however, the techniques for repair can be used for other concrete pavements as well. |
Document |
| Crack Injection: A Permanent Solution for Stopping Leaks |
Concrete Network |
As most homeowners with poured-in-place concrete foundations can attest: Cracks in basement walls are a fact of life. These cracks?due to drying shrinkage, thermal movement, and other causes?usually are minor and result in few problems. But over time, even minor cracks can grow larger and cause big headaches, such as loss of structural integrity or, more commonly, water leakage. The good news is that in most cases homeowners can now have these cracks fixed permanently?without the need for costly, disruptive excavation?using low-pressure injection of epoxy or polyurethane foam repair materials. |
Concrete Network Website |
| CRACK SEALING AND REPAIR OF OLDER SERVICEABLE BRIDGES USING POLYMER SEALERS |
KANSAS DEPARTMENT OF TRANSPORTATION |
The objective of this study is to determine the feasibility of using High Molecular Weight Methacrylate (HMWM) and EPOXY Healer Sealers for crack sealing and repair of older serviceable bridges. The study included the field application of two HMWM materials and one EPOXY material to eight bridges throughout Kansas. The field application of the materials was performed in 1992 and the field testing was completed in 1995. Each treated bridge deck also included an untreated control section. The ability of the sealers to penetrate into the cracks and prevent chloride intrusion was evaluated. Due to variability of the penetration data, laboratory tests of concrete beams treated with the sealers were initiated in 1994. |
Document |
| Crack Repair by Gravity Feed with Resin |
ACI International |
This topical application for crack repair uses a thin polymer resin to fill the crack. Penetrating by gravity alone, the resin fills the crack and forms a polymer plug that seals out water, salts, and other aggressive elements. In some cases, a structural repair of the crack can be achieved. Before any concrete is repaired, the cause of the damage must be assessed and the objective of the repair must be understood. Typical causes of concrete cracking include steel corrosion, freezing and thawing, sulfate attack, and alkali-aggregate reaction (AAR). Poor practices during the original construction can cause excessive shrinkage or settlement in the structure. Improper joint spacing and load imbalances also contribute to cracking. |
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| TESTING AND ASSESSMENT OF EPOXY INJECTION CRACK REPAIR FOR RESIDENTIAL CONCRETE STEM WALLS AND SLAB-ON-GRADE |
NAHB Research Center, Inc. |
This research report addresses the performance of epoxy injection crack repair in plain (i.e., unreinforced or lightly reinforced) concrete stem walls and slab-on-grade floors found in typical single-family residential construction. While the research is intended to address the efficacy of repairs in the context of possible seismic damage, the issue of cracked foundations and floor slabs has a much broader association with housing performance problems. In fact, it is ranked among the most common home warranty claims and home builder concerns [1] [2]. Unfortunately, there is little data regarding the effectiveness or appropriateness of various repair methodologies for plain, residential concrete foundations and floor slabs. |
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| EPOXY INJECTION FOR CRACKED CONCRETE AND SPALL REPAIR |
Anon |
A step by step seven page guide to the use of epoxy injection for the repair of cracked concrete and spalls. |
Document |
| Investigation of a Pavement Crack-Filling Robot |
Department of Civil Engineering, Carnegie Mellon University |
This report describes.a.laboratory prototype.designed to identify, map, track and fill pavement cracks. Video imaging and electronic scanning equipment installed in a van is followed by a rack carrying a hot-air lance, a sealant wand, and a supply trailer. The video sensor identifies potential cracks while the depth sensor verifies actual depth. A map plotter defines the crack length, size and depth. Using the combination of visual and depth sensing equipment, the cracks located and mapped were filled with an accuracy of better than 1 cm. (0.5 in.). |
Document |
| Concrete Crack Repair Tips |
Time Carter, Ask The Builder |
Concrete floor repair begins with the preparation. Before you mix any patching material, first make sure your concrete repair job doesn't involve any tapered edges to the patch area. Follow instructions for mixing the patching material and be sure to wet the cracked surface if you aren't using a bonding agent. The best time for concrete repairs is to apply when the weather is cloudy and damp, and 55 degrees F. Follow these tips for concrete patching success. |
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| CONCRETE CRACK REPAIR AN OVERVIEW |
EMECOLE, INC |
Concrete repair is a four billion dollar/year business according to ?Concrete Repair Digest? magazine. Concrete crack repair is one element of this market. This report limits itself to repair of concrete cracks in general and specifically to cracks of structures 16? in thickness or less. Most typically, we are relating to basements, other building foundations, parking decks, swimming pools, and unique poured-wall structures such as sea walls. These applications have in common the preferred method of repair being low pressure crack injection of a liquid polymer which hardens with time. Other applications, such as those involving very thick-walled structures (such as dams) and very long cracks (such as found on bridges and highways) may be more suited to high pressure injection. |
Document |
| Repairing Cracks in Concrete |
Corner Hardware (How To) |
The best contractor we know guarantees his concrete work to be free of cracks "for as long as it takes me to get in my truck and drive away." He's being a bit flip, but he's also acknowledging a fact of life: all concrete cracks. It's a rigid material in a flexible world. Earth movement, temperature changes and freeze-thaw cycles all have their way with concrete. Properly designed, concrete slabs handle this inevitable cracking without structural degradation. Concrete sidewalks and large slabs have control joints tooled into their surfaces to provide points where cracks can occur cosmetically. But driveways, basement floors and garage and carport slabs tend to accumulate cracks over time. At best, they're unsightly. At worst, they can threaten your safety. If your cracks seem to come from foundation settling, poor drainage or the like, contact a structural or soils engineer. Patching such cracks will not fix them. But repairing typical superficial cracks is well within your reach as a homeowner. In most cases, it's an easy job that's over and done in an hour or less. |
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| How can I Repair Cracks in Concrete? |
Wise Geek |
Home ownership comes with both benefits and responsibilities. One of those responsibilities is to maintain the concrete or cement paved areas around your home. While undertaking the repair of cracks in concrete may seem daunting at first, the process of fixing concrete is fairly simple. It is best to perform the repairs as soon as you see cracks appear for a variety of reasons. The primary reason to repair quickly is that the task is easier while the cracks are still small. Safety is another reason to get started right away; homeowners are responsible for any injuries that occur on their property. And lastly, cracked concrete is simply unattractive and you want to protect the looks and value of your home. |
Wise Geek Website |
| Repairing a Cracked Concrete Slab |
Time Carter, Ask The Builder |
Cracks in concrete slabs can be permanently repaired. The trick is to use high-strength epoxies that are easily injected into the cracks. Epoxy repair kits are affordable and can be found readily. |
Ask The Builder Website |
| How to Repair Cracks in Concrete |
Kimberly Ann Good |
Concrete work is expensive, and when a concrete sidewalk or concrete driveway is poured, no one expects a crack to form. If expansion joints or control joints aren?t properly constructed, or if the ground isn?t properly compacted before the concrete is poured, the concrete might eventually fail. If a crack develops in concrete, even the smallest crack will generally continue to expand until the concrete sidewalk or driveway becomes a cracked and broken mess. Besides making a home appear neglected, cracks in concrete often cause that concrete to eventually buckle and heave, making it dangerous for passers by to walk upon. |
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| Crack detection and vertical deflection monitoring in concrete beams using plastic optical fibre sensors |
K S C Kuang et al |
Plastic optical fibres have been employed to detect initial cracks, monitor post-crack vertical deflection and detect failure cracks in concrete beams subjected to flexural loading conditions. The intensity-based sensor system relies on monitoring the modulation of light intensity within the optical fibre as the sensor is loaded. The sensor design offers good signal stability and sensitivity to the monitored parameter and represents a cost-effective alternative to other more sophisticated health-monitoring systems currently used in civil engineering structures. |
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| EVALUATING FRP REPAIR METHOD FOR CRACKED PRESTRESSED CONCRETE BRIDGE MEMBERS SUBJECTED TO REPEATED LOADINGS |
Kansas Department of Transportation |
The bridge and highway infrastructure in the United States is aging. According to the Federal Highway Administration (FHWA), nearly 61% of the over 584,000 bridges in the United States were built prior to 1970. Many of these older bridges have been loaded to levels that are beyond the service limits the bridges were initially designed for. When this occurs, damage to the structure is typically the result. Repair and strengthening of bridges is becoming an attractive way of extending the useful life of a bridge. For a strengthening technique to be beneficial, however, it must be able to reliably strengthen the structure for a long period of time and be cost effective. |
Document |
| Taming Oregon?s Cracked Bridges |
Better Roads Website |
Five years after Oregon learned that it had hundreds of cracked reinforced concrete deck girder bridges in its inventory, the state has diagnosed the problems and is executing an action plan, but the road from then to now has not been easy. There have been multiple inspections, alarmist media coverage, bridge weight restrictions, unwelcome detours, engineering tests, original research, funding challenges, and even a follow-up review by a blue ribbon committee of the Transportation Research Board. |
Better Roads Website |
| Subsidence Cracking of Concrete Over Steel Reinforcement Bar in Bridge Decks |
Nathan Lawrence Kyle |
It is known that subsidence cracking may cause premature deterioration of concrete slab structures in salt laden environments. Chlorides from either deicing salts or marine environments may cause chloride-induced corrosion of the reinforcing steel resulting in spalling of the cover concrete. Concrete specimens with 16 mm (# 5) diameter bars were cast with various cover depths, bar spacing and two concrete mixture types to determine the influence that epoxy coated reinforcement, cement type and bar spacing may have on the probability of subsidence cracking in bridge deck slabs. It was determined that there is not a significant difference in the probability of cracking of concrete between concrete cast with epoxy coated reinforcing steel and bare reinforcing steel. Concrete subsidence cracking was found to be dependent upon the clear cover depth and cement type. |
Document |
| Crack Repair Basics |
Blastrac |
Proper maintenance of concrete floors often involves crack repair. Cracks in a concrete floor are caused by a number of factors including temperature changes, changes in moisture levels, stress loads (such as heavy traffic or heavy objects), ground or building movement, the hydration process of the concrete slab when it is curing, or poorly placed control joints. Cracks can also be caused when a concrete slab is poured on an unstable subsurface. |
Document |
| Repairing Cracks in a Concrete Floor |
Henry Harrison |
Help Around the House host Henry Harrison shows a guest how to repair surface cracks in her garage floor by using concrete crack filler. On his elbow grease scale of one to four, Harrison gives this job a one. |
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