727STRUCTURAL CONCRETE REPAIR BY EPOXY INJECTION

INJECTION

727.01Description

This work shall consist of structurally rebonding concrete cracks, fractures, or delaminations by means of an epoxy injection system in accordance with 105.03.

MATERIALS

727.02Materials 10

Materials shall be in acco rdance with the following:

Epoxy Resin Additives ................................................ 909.12

727.03Approvals

The epoxy injection system proposed for use shall be subject to approval prior to the start of the repair work. One copy of preparation, mixing, and application instructions shall be furnished. Such instructions shall have been developed especially for use with the proposed epoxy injection system.

CONSTRUCTION REQUIREMENTS

727.04Construction Requirements

The location and extent of cracks to be repaired by epoxy injection will be determined.

The work shall be performed with two-component automatic metering and mixing equipment.

Concrete surfaces adjacent to the cracks sh all be cleaned to the extent necessary 30 727.04

to achieve adequate bond of the surface seal material. Entry ports shall be provided along the crack at intervals determined in the field to ensure full depth penetration of the injection resin. Surface seal shall be applied between entry ports and on both faces of through cracks, when possible.

Epoxy injection shall begin at the lower entry port and continue until there is an appearance of epoxy at the adjacent entry port. Injection shall continue until all cracks are filled. If port to port travel is not apparent, the work shall be stopped immediately. The Engineer shall be notified.

Upon completion of the injection, the adhesive shall cure for sufficient time to enable removal of surface seal without draining or runback of material from the cracks. Surface seal material and injection adhesive runs or spills shall be removed from concrete surfaces. The face of the crack shall be finished flush to the adjacent concrete. The face of the concrete shall show no indentations or protrusions caused by the placement of entry ports.

727.05Method of Measurement

Furnishing equipment for epoxy injection will not be measured for payment.

Crack preparation for epoxy injection will be measured by the linear foot of prepared crack.

Epoxy material will be measured by the gallon placed.

727.06Basis of Payment

This work will be paid for at the contract lump sum price for epoxy injection, furnishing equipment.

Crack preparation will be paid for at the contract unit price per linear foot for 60 epoxy injection, crack preparation.

Epoxy resin adhesive will be paid for at the contract unit price per gallon for epoxy injection, epoxy material.

Payment will be made under:

Pay Item Pay Unit Symbol

Epoxy Injection, Crack Preparation ........................................... LFT 70 Epoxy Injection, Epoxy Material ............................................... GAL. Epoxy Injection, Furn ishing Equipment .................................... LS