SECTION 523: CEMENTITIOUS-GROUTED DOWELS AND ANCHORS
523.1 Description
This Work consists of providing and placing cementitious-groute d dowels and anchors for concrete Structures.
523.2 Materials
Unless otherwise specified in the Contract, the Contractor shal l use chemical adhesive anchorage per Section 522, “Chemic al Adhesive Anchors” for the installation of steel anchors in concrete Structures. Cementitious grouted dowels and anchor s shall only be used when required by the Contract. 523.2.1 Grout The Contractor shall provide gr out in accordance with Section 5 21, “Non-Shrink Grout.” The Contractor shall provide preblended mortar (grout), in acco rdance with the manufacturer’s recommendations and instructions regarding propo rtioning, mixing, maximum water content, application, and curing temperatures and conditi ons.
523.2.2 Threaded Rods or Deformed Anchor Bars
Unless otherwise specified in the Contract, the Contractor shal l fabricate dowels and anchors from full length threaded steel rods in accordance with ASTM A 307 or better, or deformed steel reinforcing bars in accordance with AASHTO M 31, Grade 60.
523.3 Construction Requirements
523.3.1 Design (Proof) Loads
Unless otherwise shown in the Contract, the Contractor shall pr ovide design tensile (pullout) loads for anchors or dowels fabricated from full leng th threaded steel bars or Grade 60 reinforcing bars in accordance with Table 523.3.1:1, “Cement itous-Grouted Dowels and Anchors Design (Proof) Loads.” Table 523.3.1:1 Cementitious-Grouted Dowels and Anchors Design (Proof) Loads Reinforcing bar size or threaded rod diameter Design tensile load for cementitious grout (lb) No. 8 5230 No. 7 4000 No. 6 2930 No. 5 2030 No. 4 1300 One (1) inch 4700 7/8 inch 3600 3/4 inch 2630 5/8 inch 1830 1/2 inch 1170
523.3.1 1 Field Proof Load Tests
The Contractor shall submit the testing method to the State Materials Bureau before beginning the field pullout tests . The Contractor shall use an applied test load for the anchors field pullout tests in accordance with Table 523.3.1:1, “Cement itious-Grouted Dowels and Anchors Design (Proof) Loads.” The Contractor shall perform proof load tests only if the Contr act requires. The NMDOT may perform proof load tests at NMDOT discretion. If the Contr act requires proof load tests, the Contractor shall use nondestructive loading and stop the te sts when the design tensile forces have been sustained for at least three (3) minutes witho ut creep or deflection. The Contractor shall use anchors that attain the specified test loads without permanently displacing the anchor or damaging the concrete. The Contractor shall replace anchor devices that fail the load test. The Cont ractor shall test replaced an chors. The Contractor shall repair spalled or damaged concrete from lo ad tests as directed by the Project Manager. In the event that proof load tests fail t o meet requirements, the Contractor shall submit a corre ctive action plan for deficienci es.
523.3.2 Embedment Depth
The Contractor shall provide the required embedment depth as sh own in the Contract Drawings. The Contractor shall maintain a distance of 1 1/2 inch or great er from the bottom of structural deck slabs and two (2) inches or greater from the fa ce of Structures in other installations. The Contractor shall only use anchor systems that can maintain this minimum surface to drill hole distance requirement and still meet certified streng th requirements.
523.3.3 Hole Preparation
The Contractor shall use impact drills equipped with carbide ti pped bits or core drill. The Contractor shall not spall or damage concrete adjacent to the h oles. The Contractor shall provide a drilled hole diameter 3/4 inch greater than the diameter of steel anchors and dowels. Diamond core drilling of the holes i s not permitted. The Contractor shall clean holes of dust, drilling debris, and other Deleterio us Materials, saturate holes with water, and remove free water before placing the dowels or ancho rs. The Contractor shall not drill with a lubricant; water is not a lubricant.
523.3.4 Placing of Anchors and Mortar (Grout)
The Contractor shall use sufficient mortar (grout) so no voids remain between the anchors and the sides of the holes after the dowels or anchors are fully inserted. During and after placing of the dowels and anchors, the Contractor shall m aintain a tight bond between the mortar (grout) and hole and between the mortar (grout) and anchor or dowel.
523.3.5 Curing
Curing shall be in accordance wi th Section 521, “Non-Shrink Gro ut.”
523.3.6 Temperature Limitations
Temperature limitations shall be in accordance with Section 521 , “Non-Shrink Grout.”
523.3.7 Damaged or Unbonded Dowels and Anchors
The Contractor shall remove and replace dowels and anchors that fail to bond or are damaged before placing new concrete or completing the Structure .
523.4 METHOD OF MEASUREMENT—Reserved
523.5 Basis of Payment
523.5.1 Work Included In Payment
The Department considers all labor and Materials for the prepar ation of holes and grouting of dowels and anchors Incidental to the completion of the Work and will not make separate payment. Section 529: Pier and Abutment Bearing Modification Page 441