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- 41-3.04 PAYMENT Not Used 41-4 SPALL REPAIR 41-4.01 GENERAL
- 41-4.01C Submittals Reserved 41-4.01D Quality Assurance
- 41-4.03B Remove Pavement
- 41-4.03D Compression Relief at Joints and Cracks
- 41-4.03D(3) Saw Cut Method
- 41-4.03E–41-4.03H Reserved
41-3.02 MATERIALSHMWM consists of compatible resin, promoter, and initiator. HWMW resin may be prepromoted by mixing promoter and resin together before filling containers. Identify prepromoted resin on the container label. Adjust the gel time to compensate for temperature changes throughout the application. The quality characteristics of HMWM resin must comply with the requirements shown in the following table:
Sand must be commercial quality dry blast sand. At least 95 percent of the sand must pass the no. 8 sieve and at least 95 percent must be retained on the no. 20 sieve when tested under California Test 202. 41-3.03 CONSTRUCTIONBefore applying HMWM, clean the pavement surface by abrasive blasting and blow loose material from visible cracks with high-pressure air. Remove concrete curing seals from the pavement to be treated. The pavement must be dry when blast cleaning is performed. If the pavement surface becomes contaminated before applying the HMWM, clean the pavement surface by abrasive blasting. Protect existing facilities from HMWM. During pavement treatment, protect pavement joints, working cracks, and surfaces not being treated. Repair or replace existing facilities contaminated with HMWM at your expense. The equipment applying HMWM must combine the components by either static in-line mixers or by external intersecting spray fans. The pump pressure at the spray bars must not cause atomization. Do not use compressed air to produce the spray. Use a shroud to enclose the spray bar apparatus. You may apply HMWM manually to prevent overspray onto adjacent traffic. If applying resin manually, limit the batch quantity of HMWM to 5 gallons. Apply HMWM at a rate of 90 sq ft/gal. The prepared area must be dry and the surface temperature must be from 50 to 100 degrees F while applying HMWM. Do not apply HMWM if the ambient relative humidity is more than 90 percent. Flood the treatment area with HMWM to penetrate the pavement and cracks. Apply HMWM within 5 minutes after complete mixing. Mixed HMWM viscosity must not increase. Redistribute excess material with squeegees or brooms within 10 minutes of application. Remove excess material from tined grooves. Wait at least 20 minutes after applying HMWM before applying sand. Apply sand at a rate of approximately 2 pounds per square yard or until refusal. Remove excess sand by vacuuming or sweeping. Do not allow traffic on the treated surface until: 1. Treated surface is tack-free and not oily 2. Sand cover adheres enough to resist hand brushing 3. Excess sand is removed 4. Coefficient of friction is at least 0.30 determined under California Test 342 41-3.04 PAYMENTNot Used 41-4 SPALL REPAIR 41-4.01 GENERAL41-4.01A SummarySection 41-4 includes specifications for repairing spalls in concrete pavement. Section 36-1.01D(2) does not apply. 41-4.01B DefinitionsReserved 41-4.01C SubmittalsReserved 41-4.01D Quality AssuranceThe Engineer accepts spall repairs based on authorized saw cut dimensions and visual inspection. 41-4.02 MATERIALSBonding agent must comply with the requirements for HMWM in section 41-3.02 except the tack-free time requirements do not apply and the HMWM must not contain wax. Caulk must be at least 50 percent silicone, designated as a concrete sealant, and comply with ASTM C834. Form board must be single-wall, double-face corrugated cardboard or paperboard covered with a bond breaker on each face. For existing joints or cracks less than 45 mils wide, use paperboard.
41-4.03 CONSTRUCTION41-4.03A GeneralPrepare spall repair areas by removing concrete and cleaning the underlying surface. Repair spalls using polyester concrete with a HMWM bonding agent. After completing spall repairs do not allow traffic on the repairs for at least 2 hours after the time of final setting under ASTM C403/403M.
Do not remove pavement until the Engineer verbally authorizes the saw cut area. Use a power-driven saw with a diamond blade. Remove pavement as shown and: 1. From the center of the repair area towards the saw cut 3. At least 2 inches beyond the saw cut edge to produce a rough angled surface
If you damage concrete pavement outside the removal area, enlarge the area to remove the damaged pavement. If dowel bars are exposed during removal, remove concrete from the exposed surface and cover with duct tape.
41-4.03C CleaningClean the exposed faces of the concrete by: 1. Sand or water blasting. Water blasting equipment must be capable of producing a blast pressure from 3,000 to 6,000 psi. 2. Blowing the exposed concrete area with compressed air free of moisture and oil to remove debris. Air compressors must deliver air at a minimum of 120 cfm and develop 90 psi of nozzle pressure.
41-4.03D(1) GeneralProvide compression relief at joints and cracks by using a form board or saw cutting. 41-4.03D(2) Form Board InstallationBefore placing concrete, place the form board to match the existing joint or crack alignment and width. Extend the form board at least 3 inches beyond each end of the repair and at least 1 inch deeper than the repair. After placing concrete, remove the form board before sealing joints or cracks. 41-4.03D(3) Saw Cut MethodAfter cleaning, seal exposed joints or cracks with caulk at the bottom and sides of the repair area. Any surface receiving caulk must be clean and dry. Place caulk a minimum of 1/2 inch beyond the edges of the repair area into the existing joint or crack. Saw cut the polyester concrete to the full depth along the existing joint or crack alignment within 2 hours from time of final setting. Use a power-driven saw with a diamond blade. 41-4.03E–41-4.03H ReservedDirectory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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