602 - Concrete Pavement Construction - Revision history

McGowanR: /* Load Transfer Assemblies */ Added quick links for Forms(0553) and Figures (602-5 & 602-6) to improve user experience

2019-09-18T14:56:37Z

Load Transfer Assemblies: Added quick links for Forms(0553) and Figures (602-5 & 602-6) to improve user experience

McGowanR: /* Load Transfer Assemblies */ Updated new content and included Presentation for Load Transfer Assemblies Inspection

2019-09-18T14:12:34Z

Load Transfer Assemblies: Updated new content and included Presentation for Load Transfer Assemblies Inspection

Clarkj25: /* Aggregate Base */

2019-05-21T13:07:51Z

Aggregate Base

JohnsonN23: /* Slipform Paving */ relink

2017-02-14T13:47:38Z

Slipform Paving: relink

JohnsonN23: /* STREET INSPECTOR’s REPORT */ relink

2017-02-14T13:08:03Z

STREET INSPECTOR’s REPORT: relink

Greenes2: /* Transverse Joints */

2015-05-08T15:29:49Z

Transverse Joints

Greenes2: /* Sawing and Sealing Joints/Longitudinal Joints */

2015-05-08T15:29:16Z

Sawing and Sealing Joints/Longitudinal Joints

Greenes2: /* Form Paving */

2015-05-08T15:28:58Z

Form Paving

Greenes2: /* Form Paving */

2015-05-08T15:28:36Z

Form Paving

Greenes2: /* Header Joints */

2015-05-08T15:27:38Z

Header Joints

@@ Line 137: / Line 137: @@
 ====[[#Load Transfer Assemblies|Load Transfer Assemblies]]====
-Load transfer assemblies are required to be field inspected a minimum of once per manufacturer per project in accordance with Section 4.07 of the Materials Quality Assurance Procedures Manual.  This inspection should be conducted as soon as possible from the time of delivery to the project.  The following PowerPoint presentation has been created to assist the field inspectors when performing these inspections.  MDOT form 0553 is to be used to document these inspections.
+Load transfer assemblies are required to be field inspected a minimum of once per manufacturer per project in accordance with [https://www.michigan.gov/mdot/0,4616,7-151-9622_11044_11367-207980--,00.html Section 4.07 of the Materials Quality Assurance Procedures Manual].  This inspection should be conducted as soon as possible from the time of delivery to the project.  The following PowerPoint presentation has been created to assist the field inspectors when performing these inspections.  [https://mdotjboss.state.mi.us/webforms/GetDocument.htm?fileName=0553.pdf MDOT form 0553] is to be used to document these inspections.
@@ Line 150: / Line 150: @@
 * The distance between joints should be checked.
-* The assemblies must be positioned at right angles to the centerline as shown in Figure 602-5.
+* The assemblies must be positioned at right angles to the centerline as shown in [[602_-_Concrete_Pavement_Construction#Expansion_Caps|Figure 602-5]].
 * After they are properly positioned, they must be staked to the base using six pins per basket assembly.
-* The basket pins must be in contact with the lower horizontal wire as shown in Figure 602-6.
+* The basket pins must be in contact with the lower horizontal wire as shown in [[602_-_Concrete_Pavement_Construction#Expansion_Caps|Figure 602-6]].
-After the contractor completes staking the assembly, the inspector should check vertical alignment with the basket level to ensure that dowels are parallel with the pavement surface (Figure 602-6).
+After the contractor completes staking the assembly, the inspector should check vertical alignment with the basket level to ensure that dowels are parallel with the pavement surface ([[602_-_Concrete_Pavement_Construction#Expansion_Caps|Figure 602-6]]).

@@ Line 137: / Line 137: @@
 ====[[#Load Transfer Assemblies|Load Transfer Assemblies]]====
 The assembly itself holds the dowel bars in position so they will not move during concrete placement and consolidation.
 * The distance between joints should be checked.
 * The assemblies must be positioned at right angles to the centerline as shown in Figure 602-5.
 * After they are properly positioned, they must be staked to the base using six pins per basket assembly.
-* The basket pin must be in contact with the lower horizontal wire as shown in Figure 602-6.
+* The basket pins must be in contact with the lower horizontal wire as shown in Figure 602-6.
-After the Contractor completes staking the assembly, the inspector should check vertical alignment with the basket level to ensure that dowels are parallel with the pavement surface (Figure 602-6).
+At this time, the bars should be visually checked for horizontal alignment by sighting over the tops of the bars to the previously set assemblies to see if the bars are parallel to the string line. Even though the assemblies have been set at right angles to the string line, the bars may not be parallel to the string line due to improper fabrication of the assemblies.
-Even though the assemblies have been set at right angles to the string line, the bars may not be parallel to the string line due to improper fabrication of the assemblies.
+Any apparent misalignment can usually be corrected by the contractor (e.g. by tapping the frame to realign the bars, etc.).
 The bars should also be inspected for complete coating on at least two-thirds of the length of the bar.

@@ Line 127: / Line 127: @@
 * Behind the grading operation, the aggregate base should be checked for thickness, elevation and proper cross section.
 * Thickness is checked by digging through the aggregate and recording the depth of the hole.
-* Depth should be within 3/4 inch (15 mm) of plan thickness (example: a minimum of 31/4 inch (85 mm) when 4 inches (100 mm) depth is specified).
+* Depth should be within 3/4 inch (15 mm) of plan thickness (example: a minimum of 3-1/4 inch (85 mm) when 4 inches (100 mm) depth is specified).
 * Elevation and cross section are determined by stretching a string line across the grade from stakes set by the instrument crew.
 * Measurements are made from the string line to the grade and recorded.

@@ Line 511: / Line 511: @@
 * Sight along stringline for sags, adequate supports and general condition.  On tight radius ramps, stringline stakes may be required at 10 to 13 foot (3 m to 4 m) spacing.
 * Depth checks on base to be taken after trimming as required.
-* Use stringline to check for proper crown or cross slope from grade stakes to top of aggregate base and record on [http://mdotcf.state.mi.us/public/webforms/public/1145.pdf Form 1145].  Inform Contractor or his representative on the job site of grade checks.  Issue permit to place for placing load transfer devices as directed.
+* Use stringline to check for proper crown or cross slope from grade stakes to top of aggregate base and record on [http://mdotjboss.state.mi.us/webforms/GetDocument.htm?fileName=1145.pdf Form 1145].  Inform Contractor or his representative on the job site of grade checks.  Issue permit to place for placing load transfer devices as directed.
 * Load transfer assemblies should be observed for coating and to make sure they are at right angles to the stringline, parallel to grade and properly spaced and pinned.  Check the free end of the expansion dowel for proper space between cap and end of dowel.
 * Base shall be moist at time of placing concrete.

@@ Line 471: / Line 471: @@
 ===[[#STREET INSPECTOR’s REPORT|STREET INSPECTOR’s REPORT]]===
-Inspector’s Report of Concrete Placed, [http://mdotcf.state.mi.us/public/webforms/public/1174R.pdf Form 1174R], is the primary report required of the paving inspector.  It should be prepared for each day that pavement is cast.  In addition to the original copy to the Engineer and a copy to the Construction Services Section, the inspector should retain a copy.
+Inspector’s Report of Concrete Placed, [http://mdotjboss.state.mi.us/webforms/GetDocument.htm?fileName=1174R.pdf Form 1174R], is the primary report required of the paving inspector.  It should be prepared for each day that pavement is cast.  In addition to the original copy to the Engineer and a copy to the Construction Services Section, the inspector should retain a copy.
 Any unusual happenings should be noted in the remarks section of the report.  Often this is most important when a problem develops and the circumstances surrounding the problem are being reconstructed later.  Any material accepted on the basis of visual inspection should be noted in the remarks.  The back of the form should be used for sketches, when necessary, to describe any irregular areas.
-In addition to the daily report, the field book prepared before the project started can be used to note additional information concerning the paving operation.  Depending on the type of project, it may be necessary for the street inspector to complete an Inspector’s Daily Report, [http://mdotcf.state.mi.us/public/webforms/public/1122B.pdf Form 1122B] documenting traffic control, equipment used or other work activities in progress.
+In addition to the daily report, the field book prepared before the project started can be used to note additional information concerning the paving operation.  Depending on the type of project, it may be necessary for the street inspector to complete an Inspector’s Daily Report, [http://mdotjboss.state.mi.us/webforms/GetDocument.htm?fileName=1122B.pdf Form 1122B] documenting traffic control, equipment used or other work activities in progress.
 Reports and documentation requirements should be reviewed with the Engineer before paving starts.

@@ Line 578: / Line 578: @@
 * Second stage sawing is to be done after the concrete has gained at least 30 percent of its strength.  Centered over relief cut (see plans and Standard Plan R-39 Series for sizes of joint groove for type of seal being used).
 * Temporary or permanent seals must be installed in expansion joints before construction traffic uses pavement.  Construction traffic may run over contraction joints after relief sawing, and when the concrete has met minimum strength requirements.
-* Joint spalls extending into  the joint area   are to be  repaired  with epoxy before sealing.
+* Clean joint with oil-free compressed air before sealing.  Inspect for stones or other foreign material.
 {{top}}

@@ Line 569: / Line 569: @@
 * Joint faces should be cleaned by sandblasting or other approved method and blown clean before sealing with hot poured sealant.
 * Joint should be completely filled, but not overfilled.
 {{top}}

@@ Line 557: / Line 557: @@
 * A Vibrator must be used thoughout the entire pour.
 * Observe operator of finishing machine.  Care should be taken to avoid moving the premolded fiber filler in the expansion joints from the vertical position.
 * After form removal, inspect edges of pavement for honeycomb.

@@ Line 552: / Line 552: @@
 * Surplus base material left inside of forms is to be removed.
 * Depth to base from stringline at top of forms measured and recorded.
-* Vibratory strike board or screed shall be used on hand work.
+* Vibratory strike board or roller screed shall be used on hand work.
 * Screeds on finishing machine and/or spreader finisher adjusted to proper crown.
 * Proper quantity of concrete being carried ahead of each screed.

← Older revision		Revision as of 15:27, 8 May 2015
Line 335:		Line 335:

	The finishers will now be able to straightedge the pavement up to and across the header. When slipform paving, the last 10 feet (3 m) or so of the longitudinal bulkhead joint adjacent to the header should be formed to prevent the slab from becoming over width. This over width will cause spalling of the edge when the paver is backed to the header.		The finishers will now be able to straightedge the pavement up to and across the header. When slipform paving, the last 10 feet (3 m) or so of the longitudinal bulkhead joint adjacent to the header should be formed to prevent the slab from becoming over width. This over width will cause spalling of the edge when the paver is backed to the header.
		+
		+	A run off header is also acceptable and is commonly referred to as a plastic tube header. See standard plan R-39-I for detail. A run off header is a plastic tube basket header that's pinned to the grade, concrete is placed and vibrated through it and beyond by at least 5 feet. Once the concrete has hardened, the joint is sawn in half, full depth, and removed. Smooth dowel bars are installed in the plastic tubes and paving resumes.

	Leaving the header is also an operation that needs close attention. The header board should be removed carefully to avoid damage to the green concrete.		Leaving the header is also an operation that needs close attention. The header board should be removed carefully to avoid damage to the green concrete.