706 - Structural Concrete - Revision history

Clarkj25: /* MEASUREMENT, DOCMENTATION & PAYMENT */

2025-09-08T15:43:38Z

MEASUREMENT, DOCMENTATION & PAYMENT

Clarkj25: /* INSPECTION & TESTING */

2025-09-08T15:42:37Z

INSPECTION & TESTING

Clarkj25: /* Machine Finishing */

2024-09-26T14:09:35Z

Machine Finishing

Clarkj25: /* Sleeper Slabs with Expansion Joints */

2024-09-26T14:08:28Z

Sleeper Slabs with Expansion Joints

Clarkj25: /* Expansion Joint Devices */

2024-09-26T14:07:53Z

Expansion Joint Devices

Clarkj25: /* Superstructure Concrete */

2024-09-26T14:06:57Z

Superstructure Concrete

Clarkj25: /* Superstructure Concrete */

2024-09-26T14:05:54Z

Superstructure Concrete

Clarkj25: /* Additional notes for Footing Reinforcement Placement */

2024-09-26T14:03:30Z

Additional notes for Footing Reinforcement Placement

Clarkj25: /* Placing and Fastening */

2024-09-26T14:02:32Z

Placing and Fastening

Clarkj25: /* Fascia Forms */

2024-09-26T14:00:09Z

Fascia Forms

← Older revision		Revision as of 15:43, 8 September 2025
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	==[[#MEASUREMENT, DOCMENTATION & PAYMENT\|'''MEASUREMENT, DOCMENTATION & PAYMENT''']]==		==[[#MEASUREMENT, DOCMENTATION & PAYMENT\|'''MEASUREMENT, DOCMENTATION & PAYMENT''']]==
−	-~~RESERVED-~~	+	Please see [[Division_7_Supplemental_-_Bridge_and_Bridge_Deck_Construction_Inspection_%26_Documentation\|Bridge and Bridge Deck Construction Inspection & Documentation]] page for more information.

@@ Line 439: / Line 439: @@
 ==[[#INSPECTION & TESTING|'''INSPECTION & TESTING''']]==
--RESERVED-
+Please see [[Division_7_Supplemental_-_Bridge_and_Bridge_Deck_Construction_Inspection_%26_Documentation|Bridge and Bridge Deck Construction Inspection & Documentation]] page for more information.
 {{top}}

@@ Line 382: / Line 382: @@
 ====[[#Machine Finishing|Machine Finishing]]====
-The second paragraph of subsection 706.03.M.1 describes the requirement for the Contractor to perform a “dry run” check. A dry run is critical to making sure that everything is properly set for the actual pour and needs to be witnessed by QA staff. Dry runs are also important for setting up wet check location markers. Notify the BoBS Construction Group of any dry run. See the Superstructure Concrete Placement section for more information.
+The second paragraph of subsection 706.03.M.1 describes the requirement for the Contractor to perform a “dry run” check. A dry run is critical to making sure that everything is properly set for the actual pour and needs to be witnessed by QA staff. Dry runs are also important for setting up wet check location markers. Notify the BoBS Construction Section of any dry run. See the Superstructure Concrete Placement section for more information.
 ===[[#Curing|Curing]]===

@@ Line 372: / Line 372: @@
 Sleeper slabs are to be placed and cured in the same manner as the bridge deck.
-To provide a more consistent ride some Contractors will propose pouring the stem of the sleeper T with the approach. Consult with BoBS before allowing.
+To provide a more consistent ride some Contractors will propose pouring the stem of the sleeper T with the approach. Consult with BoBS Construction Section before allowing.
 ===[[#Placing Anchor Bolts and Position Dowels in Concrete|Placing Anchor Bolts and Position Dowels in Concrete]]===

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 =====[[#Expansion Joint Devices|Expansion Joint Devices]]=====
-The current standard joint set is at a two-inch opening, unless otherwise shown on the plans. Most standard expansion joint devices allow for four inches of movement. If the joint device is set at two inches, it will allow for two inches of contraction and two inches of expansion. In the case where the plan expansion or contraction will exceed one inch the designer and BoBS should be contacted for guidance. In those cases, the joint should be set based on temperature or a different joint device may be needed.
+The current standard joint set is at a two-inch opening, unless otherwise shown on the plans. Most standard expansion joint devices allow for four inches of movement. If the joint device is set at two inches, it will allow for two inches of contraction and two inches of expansion.
 Expansion joint devices are to be placed ¼” to 3/8” below the top surface of the deck, and in accordance with the contract.

← Older revision		Revision as of 14:06, 26 September 2024
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	Do not allow the Contractor’s employees to clean concrete placement tools by banging them on the epoxy coated reinforcement.		Do not allow the Contractor’s employees to clean concrete placement tools by banging them on the epoxy coated reinforcement.
		+
		+	Any request for changes to the pour sequence called out in the plans requires a minimum of 7 days for review.
		+
		+	When pouring a span with a pin and hanger connection and a pier the pour should pour towards the pin and hanger and not away from it.
		+	Contact the BoBS Construction Section with any questions.

	====[[#Nighttime Casting of Superstructure Concrete\|Nighttime Casting of Superstructure Concrete]]====		====[[#Nighttime Casting of Superstructure Concrete\|Nighttime Casting of Superstructure Concrete]]====

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 Setting the screeds on finishing machines is to be done by Contractor personnel from information shown on the plans or provided by the Engineer. Checking the screed is to be done by the inspector. After the screed rails have been set, the finishing machine is passed over the deck to check for plan slab thickness and reinforcement cover. Record results on Form 1131 “Bridge Decks – Concrete Depth Measurements” as dry measurements.
-Dry run measurements should be taken between 5 feet and 10 feet from each bulkhead, then at some interval (ex. 20 feet) for the remaining distance, including center span (see example below). If distances are much less than 20 feet, it will be difficult to get all measurements and due to timing can become distracting and unsafe. If spacings are over 25 to 30 feet, there may not be adequate checks to make sure the deck and finishing machine are reacting as planned.  Transverse spacing should aim for the center of each bay. When casting the second half of part width decks, or if paving decks where widenings or beam lines are added, it is critical to contact BoBS Bridge Construction for screed set up. It is best to involve BoBS prior to setting deck forms due to the complexity of operations.
+Dry run measurements should be taken between 5 feet and 10 feet from each bulkhead, then at some interval (ex. 20 feet) for the remaining distance, including center span (see example below). If distances are much less than 20 feet, it will be difficult to get all measurements and due to timing can become distracting and unsafe. If spacings are over 25 to 30 feet, there may not be adequate checks to make sure the deck and finishing machine are reacting as planned.  Transverse spacing should aim for the center of each bay. When casting the second half of part width decks, or if paving decks where widenings or beam lines are added, it is critical to contact BoBS Construction Section for screed set up. It is best to involve BoBS Construction Section prior to setting deck forms due to the complexity of operations.
 Wet measurements must be taken during the concrete placement, and at or near the same locations as the dry run measurements. Record results on Form 1131 “Bridge Decks – Concrete Depth Measurements” as wet measurements. Enough wet checks should be taken at each location to ensure that proper cover and thickness is being obtained. If depth checks show a lack of cover or thickness, additional checks should be taken.
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 When there are many narrow bays, it is still recommended to perform dry and wet measurements for all bays. Work with the operator of the finishing machine to pause the carriage of the paver so that the depth checks can be safely measured.
-When casting the second half of part width decks or if paving decks where widenings or beam lines are added, a tighter frequency of depth checks may be needed. The additional checks are needed to adjust loading the deck for beam deflection differences. In these cases where the screed rail is on a member that does not deflect with or at the same rate as the remainder of the beams, the deck may need to be preloaded to deflect beams and ensure proper thickness and ride quality. Typical pour rates vary from forty to eighty cubic yards per hour. If this is the case, contact BoBS Bridge Construction for allowable lead time between placing and finishing the concrete.
+When casting the second half of part width decks or if paving decks where widenings or beam lines are added, a tighter frequency of depth checks may be needed. The additional checks are needed to adjust loading the deck for beam deflection differences. In these cases where the screed rail is on a member that does not deflect with or at the same rate as the remainder of the beams, the deck may need to be preloaded to deflect beams and ensure proper thickness and ride quality. Typical pour rates vary from forty to eighty cubic yards per hour. If this is the case, contact BoBS Construction Section for allowable lead time between placing and finishing the concrete.
 [[File:706-7.png|800px|thumb|center|'''Figure 706-7''']]

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 * If a template is used to hold vertical steel in place during concrete placement, it should be laid out by the Contractor and verified by an inspector prior to the pour.
 * All vertical reinforcement must be installed and tied in place prior to placing concrete. Do not allow the Contractor to “stick” vertical reinforcement into the plastic concrete during placement as it does not allow the concrete to properly consolidate around the reinforcement.
 ===[[#Placing Galvanized Metal Pipe Sleeves|Placing Galvanized Metal Pipe Sleeves]]===

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 Additional bar chairs are required outside the fascia beam to support the reinforcing steel along and near the fascia. On concrete box beams without slab ties, a bar chair will be required along the longitudinal centerline of each beam. Chairs used at the fascia are typically different sizes than the ones needed at interior locations.
-The upper layer of reinforcing steel will be supported over the supports for the lower layer of steel with rows of approved continuous steel bar supports consisting of a minimum of three longitudinal wires. Supports for holding reinforcement will be approved plastic or coated metal chairs. Bar chairs for the top mat of steel are to be placed directly over the bar chairs below the bottom mat of reinforcement. When there are wide beams and relatively narrow bay making the ¼ and ¾ points impractical for the bottom row of bar chairs, place the bottom row as close to the edge of the beam as the deck forms will allow and place the top mat directly above them. If beams are wider than 4’ or there are smaller than #5 transverse bars, an additional row of chairs may be needed above the beam line for stability.
+The upper layer of reinforcing steel will be supported over the supports for the lower layer of steel with rows of approved continuous steel bar supports consisting of a minimum of three longitudinal wires. Supports for holding reinforcement will be approved plastic or coated metal chairs. Bar chairs for the top mat of steel are to be placed directly over the bar chairs below the bottom mat of reinforcement. When there are wide beams and relatively narrow bay making the ¼ and ¾ points impractical for the bottom row of bar chairs, place the bottom row as close to the edge of the beam as the deck forms will allow and place the top mat directly above them. If beams are wider than 4’ or there are smaller than #5 transverse bars, an additional row of chairs may be needed above the beam line for stability. These chairs will likely need to be a different size to account for the haunch depth.
 The stability of the mat is important to maintain the bond of the plastic concrete and the rebar intact during concrete placement which requires workers standing on the reinforcement. Occasionally an additional row of bar chairs will be placed near the centerline of the beam between the top and bottom matts of reinforcement.  This has proven to provide additional support with wider beam.
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 The top mat of reinforcing steel must be securely tied to the structural member at 5-foot intervals along each beam or girder.
 No bar substitutions are allowed without written approval from the Engineer of Record.

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 * Supporting the screed rail will typically require the facia forms to utilize a double 2X6 top plate with 2X6 studs and a 2X6 bottom plate.
 * Remember to obtain good lines and grades in finished concrete. The forms must remain securely in place during concrete forming and be smooth and free of defect.
 ===[[#Steel Reinforcement|Steel Reinforcement]]===