Section 611 Section 611 indicated on the plans or directed. Weep holes shall be constructed as shown on the plans or as directed. In case a brick is moved or the joint broken after laying, the brick shall be taken up, the mortar thoroughly cleaned from the brick bed and joint, and the brick relaid in fresh mortar. In hot or dry weather, brick masonry shall be protected and kept wet for a period of at least 48 hours after the brick are laid. Only expert bricklayers shall be used for this work, and all details of the construction shall be in accordance with approved and satisfactory practice. All exposed masonry shall present an even, uniform, neat, and workmanlike appearance, and the exposed surfaces shall be thoroughly cleaned of all mo rtar and scars and the surface left the natural color of the brick.
611.03.3 Backfill . Backfill for brick masonry shall be in accordance with the provisions
of Subsection 203.03.8.6.
611.04 Method of Measurement . Brick masonry will be measured by the cubic yard or
by the thousand. The unit for measurement will be indicated on the bid sheet. When measurement is by the cubic yard, the volume will include the mortar. When measurement is by the thousand, the mortar will not be measured for payment. When either concrete masonry or brick masonry is permitted under Subsection 604.03.4, measurement will be made in accordance with Subsection 604.04. Excavation for brick masonry will not be measured for payment.
611.05 Basis of Payment . Brick masonry will be paid for at the contract unit price per
cubic yard or per thousand, as indicated, which shall be full compensation for completing the work. When brick masonry is used as an optional item of construction under Subsection 611.04, payment will be made as provided in Subsection 601.05. Payment will be made under: 611-A: Brick Masonry - per cubic yard or thousand SECTION 612 - FLOWABLE FILL
612.01 Description. This work shall consist of furnishing and placing a flowable fill
material. Uses include, but are not limited to, placement under existing bridges, around or within box culverts or pipe culverts, or at other locations shown on the plans.
612.02 Materials. All materials shall meet the requirements of the following
Subsections, or as stated herein: Fine Aggreg ate............................................................................................. * Portland Cement ............................................................... 701.01 and 701.02 Fly Ash ............................................................................................... 714.05 Air Entraining Admixt ures ** ........................................................... 713.02 Water .......................................................................... 714.01.1 and 714.01.2 Calcium Chlori de ** ............................................................................ 714.02 * The gradation of the fine aggregate shall be fine enough for the fine aggregate to stay in suspension in the mortar to the extent required for proper flow and shall conform to the following grading: Sieve Size % Passing 1/2 inch 100 No. 200 < 1 ** High air generators shall be used, as required, in order to increase the total air content to 25 – 35%. Only approved high air generators shall be used to obtain the required air content. Either a Ty pe C or E chemical admixture or maximum 1.0% calcium chloride by weight of the total cementitious materials may be added as required by the application and with the approval of the Engineer. Calcium chloride may not be used where the flowable fill comes into contact with metal. Adding the Type C or E chemical admixture or calcium chloride does not require a different or new mixture design from one previously approved.
612.02.1 Mixture Design. Flowable fill is a mixture of portland cement, fine aggregate,
water, and, as required to obtain the required to tal air content, either high air generators or air entraining admixtures. Fly ash shall be used for Non-Excava table applications. Flowable fill contains a low cementitious content for reduced strength development. At least 30 days prior to production of flowable fill, the Contractor shall submit to the Engineer proposed flowable fill mixtures design following the mixture design submittal procedures listed in the Department’s Concrete Field Manual . The concrete producer shall assign a permanen t unique mixture number to each flowable fill mixture design. All flowable fill mixtur e designs will be reviewed by the Materials Division prior to use. Flowable fill mixture designs disapproved will be returned to the Contractor with a statement explaining the disapproval. Once approved, a flowable fill mixture design may be transferred to other projects without additional testing provided the material sources have not changed. Allowable changes in material sources shall meet the re quirements of the Department’s Concrete Field Manual , Section 5.7. For allowable changes in material sources, the mixture design shall be re-verified following the requirements of Subsection 612.02.1.2.
612.02.1 1--Proportioning of Mixture Design. The mixture design proportions shall be
determined based on batches mixed using production equipment. Table 1, “Flowable Fill Mixture Design Proportioning Guide”, is a guide for proportioning flowable fill, except where noted. Table 1 Flowable Fill Mixture Design Proportioning Guide Excavatable Non-Excavatable Material Amount (lbs/yd3) Cement 75 – 150 * 75 – 150 * Fly Ash - 150 – 600 * Fine Aggregate ** ** Water *** *** * Guideline for proportioning. The actual amount may vary from the amount listed the Table 1. ** Fine aggregate shall be proportioned to yield one cubic yard of mixture as verified by unit weight. *** Mixture designs shall produce a consistency that will result in a flowable self- leveling product at time of placement. Each mixture design shall be verified using production equipment prior to submittal of the mixture design for review. During the verification, the mixture design shall meet the requirements of the “Performance Requirements Flowable Fill Design” listed in Table 2. The verification performance data and the corresponding batch ticket shall be submitted with the mixture design. Table 2 Performance Requirements for Verification of Flowable Fill Mixture Designs Mixture Property Performance Requirement Required Test Method Excavatable Non-Excavatable Consistency Approximate 8-inch spread (see below) Total Air Content (%) 25 – 35 5 – 15 AASHTO T121 28 Day Compressive Strength (psi) – Minimum 125 AASHTO T22 and T23 Unit Weight (lbs/ft3) 90 – 110 100 – 125 AASHTO T121 The consistency of the fresh mixture shall be that of a thin slurry. The consistency shall be tested by filling to the top a three-inch di ameter by six-inch high cylinder that is open on both ends. With the mixture in the cylinder, immediately pull the cylinder straight up. The correct consistency of the mixture will pr oduce a spread meeting the requirements in Table 2 with no segregation.
612.02.1 2--Verification of Mixture Design. The verification shall be performed by the
Contractor prior to submittal of the mixture design proportions for review. The verification performance data and the corresponding batch ticket shall be submitted with the mixture design. The verification shall be performed using the batching and mixing equipment anticipated to be used during production of the mixture for the project. In addition to the performance requirements listed in Table 2, the verification shall meet the batching tolerance requirements for the material weights listed in the Department’s Concrete Field Manual . Adjustments of the proportions of fine aggregate and/or water shall be made to achieve suspension of the fine aggregate. The requirements in Table 2 for consistency, percent total air content, compressive strength, and unit weight are for verification of the mixture design proportion purposes only and are not intended for jo bsite acceptance requirements.
612.02.2 Acceptance of Mixture. The acceptance of the mixture at the job site will be
based on the performance of the flowable fill mixture placed and will be at the discretion of the Engineer. For acceptance of the mixture at the job site, the mixture shall be self- leveling and shall not settle, segregate, or have excessive bleed water.
612.02.3 Manufacturing. Flowable fill will be batched, mixed, and transported in
accordance with the requirem ents of Section 804.
612.02.4 Sampling and Testing . The yield shall be determined by testing the first load
placed on each production day in accordance with AASHTO T121. If adjustments are made to the mixture design proportions to correct for yield, the yield shall be determined on the next load with the adjusted proportions.
612.03 Construction Requirements. Prior to placing flowable fill, each end of the
structure shall be plugged leaving an opening at each end no larger than necessary to accommodate the filling equipment. Flowable fill shall be discharged from the mixer by any reasonable means into the area to be filled. Unless otherwise approved by the Engineer, filling will begin on the downstream end of the structure and continue until no further material will enter the structure. The flowable fill will then be continued from the upstream end of the structure.
612.04 Method of Measurement. Flowable fill will be measured by the cubic yard,
which will be determined from the yield in a ccordance with the requirements of Subsection
612.02.4 The yield will be calculated by dividing the actual batch weights of each load by the unit weight of the mix, which will be determined by testing the first load placed on
each production day.
612.05 Basis of Payment. Flowable fill, measured as pr escribed above, will be paid for
at the contract unit price per cubic yard, which price shall be full compensation for furnishing all labor, equipment, tools and materials to complete the work. Payment will be made under: 612-A: Flowable Fill, Excavatable - per cubic yard 612-B: Flowable Fill, Non-Excavatable - per cubic yard SECTION 613 - ADJUSTMENT OF CASTINGS, GRATINGS, AND UTILITY APPURTENANCES
613.01 Description . This work consists of furnishing all materials and adjusting existing
catch basins, inlets, manholes and other designated structures in accordance with these specifications and in reasonably close conformity with the lines, grades and dimensions