into the existing reinforcing steel. And all that new concrete meant a lot of tie bars and a lot of dowel drilling. Enough concrete was removed around the rebar to allow room for the dowels at the bottom of the precast pier cap. The idea is to reduce restraint so your slab doesn't crack. proctor density approved equal. Reply To This Thread Posting in the Eng-Tips forums is a member-only feature. 1.2K views Answer requested by Ridam Dhami Related Answer If using rebar theory, the appropriate Ψe reduction factor can be used to account for the epoxy coated rebar. Rebar Doweling - Hilti USA sidewalk at existing tool joint surface be level with concrete shall match color of and joint sealing compound 4 ' 5 shall be placed on a b. a min. 3) clean rocks and concrete out of the fill dirt. sidewalk joints. Do remove the grass first. Tie Slab to Wall?| Concrete Construction Magazine A concrete pedestal was left at the center of the existing columns. Plate dowels in concrete slabs | For Construction Pros Does this sound like the way to do this. Salam. Posted by jdd48 on 6/24/14 at 12:26 pm to civiltiger07 We recently extended our back patio with a slab, and there was no rebar or dowels tied into the existing slab. Don't tie your new slab into the house foundation. If you've got the proper tools you can blow an 8" hole in concrete in about 45 seconds. e) Be doweled into existing curbing, as applicable. I would use either 1/2" or 5/8" threaded rod or #5 rebar. Placing Concrete - Place concrete into the repair area from ready-mix truck or other mobile batch vehicles. Dowel size and placement questions | DIY Home Improvement ... 8 Foot Tee Wall, 12" Thick, Backfill 2-7 Feet, <50% Fines, Machinery Allowed On Non-Structural Slab, And On Soil. Our Process - Concrete Solutions of Atlanta PDF 842 - Drilling and Grouting Section 842 Drilling and ... Dowels are lengths of rebar that extend from near the bottom of the footing up into the cavity area of the forms, and are used to control a transverse sliding movement, as well as pulling or tipping movement. Figure 9-80 shows the drilling operation being performed at a widening joint. Put a slab next to it. PDF Best Practices for Dowel Placement Tolerances greater than that of the tie bars. (280 mm) splice. That's why you shouldn't dowel into the perimeter walls and glue the bars with epoxy. When butting up a new footing to a basement wall, the boss would have us simply knock a hole or two in the cinderblock about 6" round, stuff some ruble into the top of the block below the holes & allow the concrete to flow into the block & drop a piece of rebar in once the concrete level was half way up the hole. Between 7 and 8 inches, you are in a gray zone, and the use of dowels depends on the amount of trucks, the traffic patterns (channelized or non channelized), speed, etc. The bars may be equipped with hooks or heads on the cast-in end, but are by necessity straight on the post-installed end; b. He's calling out for a 6-inch deep concrete, with a 3250-PSI straight cement, and also he's gonna go with wire mesh. Additionally, dowel rods can be used when looking to reinforce concrete in one horizontal direction, whilst allowing some movement in a direction perpendicular to the initial direction. Post-installed reinforcing barsare embedded in adhesive in a hole drilled in existing concrete on one side of the interface and are usually cast into new concrete on the other side of the interface (Figure 1). Fill the hole with epoxy slowly. Because its the easiest quickest way to do the form work. 1) #4 2) Yes, if that gets the rebar into the holes, with the ridges. HOW TO install rebar with epoxy anchor into concrete ... (Dowel rebar into existing concrete) Step: 4 (Install 4,000 p.s.i. As a mason and a builder, I've used 5/8" rotary hammer drill bits to epoxy #4 rebar to reinforced concrete as a "tie in" or an anchor. Clean out hole really well (compressed air is best), get some epoxy into the hole, hammer rebar in then pour your slab next to it tieing the rebar into your mesh. Shear Dowels - Hilti USA Would someone explain how to connect the rebar properly? The plastic sleeve is nailed to lumber edge forms before concrete placement and the steel plate slides into the sleeve after forms are removed in preparation for the adjoining slab. High Strength Anchoring Epoxy | QUIKRETE: Cement and ... Mark the tie bar locations and drill holes into the existing concrete at least 10 in. Epoxy can be used for anchoring bolts, dowels and reinforcing bars, i.e. Re: Drilled and Epoxied Rebar Installation. Hi Gary, If using anchor theory, there is no testing for epoxy coated rebar being used with a Hilti adhesive for anchoring into concrete. As figure A.2 shows, the slab with only 2 inches of concrete cover between dowel and surface performed as well as the slab with 3 inches of cover for up to 10 million load cycles (Odden et al., 2004). And he designed his own specs on this one. Just lay a 2X4 on the ground with the 3 1/2" side vertical and boom instant form. Restraint increases the chance that your slab will crack. be a 2" x 6" form board or d. forms shall be set up so that . If you're looking to extend, join or strengthen walls, slabs, columns or beams, then post-installed rebar systems can help. Answer: 1. Load your concrete epoxy into your epoxy gun following the instructions provided with the system. Step 5 Insert your rebar dowel into the hole. there was no transversal rodding used. These dowel bar slots are then chipped out to place a 1 1/4 " dowel bar 15" long in the slots. The size and diamond-shape of the Taper Dowel provides concrete joint stability, load transfer and smooth slab-to-slab transition, without restraining floor movement. The joint must be made with the use of #4 rebar dowels 12 inches in length spaced a minimum of 16 inches on center. Down here in gator country my architect would typically prescribe: drill and epoxy 36" #5s 24" o.c. in Figure 2. Just lay a 2X4 on the ground with the 3 1/2" side vertical and boom instant form. Making these dowel holes deeper and lower will help to prevent popping the edges of the concrete on the top when you bend the dowels down. re: Tying New Concrete to an Existing Foundation - Yes or No? When the rebar is not being used to hold the concrete members together, post-installed anchor theory can be applied. Coating rebar. One way to minimize these separations is to pin the two sections together with rebar. Some engineers require the edges of the existing footings and foundations where the new and old concrete meet be roughened. back of curb radius5' min.10' max r.o.w. 1 . The Chester Bross crew of 16 had to drill a total of 40,492 holes, 9 inches deep to tie 18-inch rebar into the existing concrete. Insert the tip of the epoxy gun into one hole and pump the trigger. 8620-31) is a commercial grade, high strength, two component structural epoxy with an extended working time of approximately 20 minutes. Push the dowel in as far as it can go, and then move on to the next hole. Can a rotary hammer drill with carbide tip be used to drill the hole? Bonding Dowels in Drilled Holes There are three materials currently specified to bond a reinforcing dowel into a drilled hole in existing concrete. The intend of the dowels are to pull together the old and new concrete together such that their bonding become inseparable. Bonding fresh concrete to existing concrete. The rebar, or dowels, should be sized for the job. reduced concrete cover did not significantly affect the LTE performance of pavement. Squeeze the epoxy out in about 15 seconds. The horizontal and vertical bars are recommended to be constructed of 1/2" (13 mm) rebar and should be embedded to a depth of at least 6" (152 mm) in the concrete. The horizontal rebar should be wired to vertical dowels that are grouted into the concrete base as shown in Figure 2. 416.3.4 Placing Dowel Bars in Existing Concrete (1) Drill holes into the edge of the existing concrete to the dimensions the plans show. 5) I would do 12". And then also we're not gonna dowel into the existing driveway, we're just gonna go 6 . 3) Quikrete 8.6 oz. Don't tie your new slab into the house foundation. It is often said that you should not dowel into an existing slab because you want both pieces of concrete to be able to move separately. Accommodate some differential movement longitudinally along the joint. The thought is, if your patio begins to shift and it is locked into the existing slab it could either crack the patio or damage the house. (Epoxy) Rebar dowels are typically used to strengthen the bond between two concrete structural elements. High Strength Anchoring Epoxy-862031 - The Home Depot 4) These look to be primarily shear, so probably 6" embedment is fine. A.: In ACI 302.1R-89, "Guide for Concrete Floor and Slab Construction," ACI Committee 302 does not recommend keyed joints for slabs thinner than 6 inches, and also doesn't provide guidance for dowels in slabs thinner than 5 inches. More information. This eliminates the need to embed the bar deep enough into the base material to develop the rebar for steel failure. Diamond shapes for formed That solution would be for a monolithic pour on base material compacted to a min. 8 Foot Tee Wall, Backfill 2-7 Feet, 0-100% Fines, Machinery Allowed On Non-Structural Slab, And On Soil. Grouting bolts, dowels, and rebar into concrete, stone, and masonry. This eliminates the need to embed the bar deep enough into the base material to develop the rebar for steel failure. If rebar is used in place of dowels, it must be taped or greased. The method is called a dowel to join the 2 slabs. Learn how to install rebar with an epoxy anchor into concrete using Hilti's standard cleaning method. existing concrete curb & gutter full depth saw cut at existing flowline remove curb only #3 dowel bar, 24" long on 24" centers, dowel & epoxy 8" into existing concrete. of 2500 psi however. Maintain proper vertical and horizontal alignment while drilling the holes. Drill 5/8-inch diameter holes six inches deep into the old concrete. Filling joints and voids in masonry. Another rule of thumb for the use of dowels is truck traffic. glenn. Even some require application of bonding agent to enhance the bonding. Selecting the correct product Use Prime Bond 3000 or Prime Bond 3100 to produce pourable grout for horizontal applications. Efficient use of steel. 416.3.4 Placing Dowel Bars in Existing Concrete (1) Drill holes into the edge of the existing concrete to the dimensions the plans show. Whether you need high-volume dispensing tools and bolts for rebar doweling on a high-traffic infrastructure retrofit project or a concrete adhesive for a do-it-yourself project, Simpson Strong-Tie offers a wide variety of adhesive anchoring products to meet virtually any need. 1) hammer-drill holes sideways into the cut surfaces of the concrete to make holes 3-inch deep for dowels (3/8 rebar that I already have sitting around) 2) remove all loose material from the dirt hole. Re: rebar dowel size and spacing. When the rebar is not being used to hold the concrete members together, post-installed anchor theory can be applied. HOW TO USE POST-INSTALLED REBAR. The range of dowel bar length will be 45d to 50d as d is the dia of the bar. Pull the tip of the gun out of the hole as it fills. Slots for the dowel bar retrofit are milled into existing concrete with the modified roto mill head Many states are retrofitting older highways with epoxy-coated dowel bars. 8 Foot Tee Wall, Backfill 2-7 Feet, <50% Fines, Machinery Allowed On Non-Structural Slab, And On Soil. Plate Dowels - Widely Used in Floor Slabs Now being used in some parking areas / industrial pavements. The retrofit begins with cutting of six slots (three in each wheel path) across all transverse joints or cracks. I have been told by several contractors here that the rods should have been a minimum of 4-6" into the original driveway and should have been placed no more than 16" apart. 2. High Strength Anchoring Epoxy. Use f8 mesh on 60mm 5 chairs. 7. where new sidewalk is placed against existing where new sidewalk is placed against existing sidewalk, saw cut existing sidewalk to an even straight line prior to installation of the new sidewalk install #4 rebar dowel into existing sidewalk. Bottle brush and air for 30 seconds. Honeycombing reduces concrete strength and durability. This eliminates the need to embed the bar deep enough into the base material to develop the rebar for steel failure. Vibrate fresh concrete to hold old concrete and ensure fresh concrete has surrounded the bar fully. After holes are drilled into the concrete footing or slab, the holes are cleaned and epoxy injected. Used to brace joints between concrete 8 9 656.02 Materials. Very heavy and massive pieces of concrete will use heavier gauge rebar, but for typical driveway, sidewalk and step repair, ½-inch rebar is usually adequate. 4" sand cushion 1 / 8" to line and grade and shall and sand shall be compacted to 95% std. However, the concrete may crack anyway because the bars also . Once the hole is completely filled with epoxy, put the end of one of your rebar dowels in it. I have also heard it's really difficult to drill the dowel holes into an existing 4" slab of sidewalk.-use rebar reinforcement. Dowel bar retrofit Saw truck sawing slots for the Dowel Bar Retrofit. Than use longer dowels and stick in as usual when done stand on the dowel sticking out above the floor surface to bend down into the pour. To transfer the load of producing in the concrete slab or pavement, dowel bars are left to joint any slab, column, and pavement. And I'm about 99.9% (unless it is off the ground) sure your house isn't on piles. Distribute the concrete evenly to avoid the need of excessive shoveling. 4. Formulated to allow for adequate placement time. Drill through sound concrete compatible diameter to a specified depth as per the specifications of epoxy adhesive and fix the new rebars under a competent person's supervisio. The existing specifications are based on limited laboratory testing and ana-lytical investigations. Once sealed within the concrete the air cannot get to the bar and so it will never rust. Furthermore, if you're tying into another concrete component -- like a footing or a reinforced concrete wall -- you must use a bit that allows for the placement of the rebar and the anchoring epoxy. I believe it has 8" wall. Best to avoid placing too long a section at once and also other items of good practice to minimise this.. contraction joint shall be 3/8" deep on 4' centers. 10 11 Reinforcing Steel 602 12 13 Epoxy-Resin Adhesive 712.02 14 15 Epoxy Grout 712.04(B) 16 17 Submit test certificates indicating conformance of materials to . Celtic will not be responsible for any permits or cracking that occours in concrete. Anchor the dowel bars into the existing concrete with an epoxy conforming to 416.2.3.2. I want to pour a 16 x 22 patio from my house foundation (slab) and encasing 3/4 sides of the storm shelter. rebar, into concrete and masonry. Inject epoxy into the backs of the holes. Use 16mm 3/4 round bar and drill 300mm 12 into existing garage slab at 900mm 3′ intervals 100mm 4 down from top of concrete ,cut the round bars into 600mm 2′ lengths, grease ,with any kind of grease,half the length of rod and, then whooops beer time, have a coldy then clean out holes and push greasy end into holes. fiber reinforced concrete 4-5 inches thick) (Hand tool joints, picture frame edges and joints with light broom finish) Step: 5 (Saw cut joints to make sure they're 25% of overall depth) (Pressure wash and clean up) Even if you did need/decide to dowel them together, stainless steel would be un-necessary - just get some standard T12 (12mm) or similar reinforcing bar and drill it into the existing, making sure it has at least 40mm concrete cover all around. surface full depth asphalt . This is the common reason for dowel rod use in road repairs (known as dowel bar retrofit). You drill into the existing slab every 400mm with a 12mm hole 100mm at least into slab) then get some rebar. Insert 12-inch lengths of rebar into the holes, twisting them to ensure an even coating of epoxy around their circumferences and along their lengths within the holes. -dowel rebar into the adjacent existing sidewalk? I was thinking of cutting a few short (140mm) channels across a few places where the new and old concrete joins to a depth of half the slab thickness (~70mm) and laying a 12mm x 100mm length of rebar into a bed of epoxy and finally, filling the channel over the rebar with high strength repair mortar. of 6" imbediment. I don't want to core drill. Dowel into existing concrete, spacing maximum - 18". • Limited use of dowel bar inserters (DBIs). Rebar dowels are used to brace the joints between two concrete elements. A good ICF footing will be at least 11" deep, allowing for 8" of the dowel to be embedded into the concrete (a 4 to 6-inch "L" at . Sidewalks must be continuous with joints; provided at 40'-0" center to center max. deep. Dowel Bars can be provided in any length and with any diameter. I have concerns with him messing with the storm shelter. 7,500.00 7,500.00 Concrete Celtic will furnish all labor and material to completeabove portion of the project. Is this overkill?-use mesh reinforcement. Alright in this video we go over the usefulness and time saving of Speed/Slip dowels for your rebar instead of later drilling up to 100 holes into the freshl. Broom Finsh with one coat of Cure and Seal. I need to dowel #8 rebars with 20" embedment for a new pier into an existing concrete footing. The carport has very good foundations all around, and I'd like to reenforce my concrete slab by tying the rebar into the existing foundation. Strip form and insert ungreased dowel into the Speed Dowel sleeve Dowel Bar Installation Using vs. 6 reinforcing bars where new concrete is to be joined to existing concrete by means of 7 dowel reinforcing bars grouted into holes drilled into existing concrete. Can be effectively used in thinner slabs than round dowels. rebar was used and was 16" square pattern. Recommended uses: Interior and exterior. into an existing footer with a min. Rebar dowels are used to brace the joints between two concrete elements. When the rebar is not being used to hold the concrete members together, post-installed anchor theory can be applied. Step 4. Historically, 3/4 inch x 14 inch and 1 inch x 16 inch smooth round dowels spaced at 12 inches on center have been used in construction joints for 5- to 6-inch and 7- to 8-inch-thick slabs (Ref. Rebar is drilled and epoxied into the old concrete to help keep the new concrete in place.