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- 72-3.03B Placement Method A
- 72-3.03E Placing Concrete
- 72-3.04 PAYMENT
- 72-4.01 GENERAL
72-3.03 CONSTRUCTION72-3.03A GeneralExcavate a footing trench along the toe of the slope. Mix the coloring agent uniformly and homogeneously with the concrete. Local surface irregularities of the concreted-rock slope protection must not vary from the planned slope by more than 1 foot as measured at right angles to the slope. At the completion of slope protection work, fill voids in the footing trench with excavated material. Compaction is not required. 72-3.03B Placement Method APlacement Method A must comply with section 72-2.03B. 72-3.03C Placement Method BPlacement Method B must comply with section 72-2.03C. 72-3.03D Placing Weep TubesWrap each weep tube in filter fabric. Place weep tubes and secure them such that they contact the face of the fabric on the slope and extend at least 2 inches beyond the outer surface of the rock. If placement of fabric on the slope is not required, the end of the tube near the slope must be covered with a cap made of the same material as the weep tube. Ensure that concrete will not plug the tube and perforations. 72-3.03E Placing ConcreteThe surface of the rock to be concreted must be cleaned of adhering soil and then moistened. At any one location, place the concrete in a continuous operation during a work day. Deposit concrete by use of chutes, tubes, buckets, pneumatic equipment, or other mechanical methods. Do not allow the concrete to flow more than 10 feet across the slope protection. Immediately after depositing, spade and rod the concrete into place with suitable spades, trowels, or other suitable means. The minimum concrete penetration must comply with the requirements shown in the following table:
After placing the concrete, thoroughly brush the rocks to expose the top surfaces. Outer rocks must project above the concrete by a height of 0.25–0.32 times the rock diameter. After completion of any 10-foot strip, do not allow workmen or loads on the surface for at least 24 hours. Cure the concreted-rock slope protection by one of the methods specified for curing concrete. As an alternative, you may cure the concreted-rock slope protection by sprinkling a fine spray of water every 2 hours during the daytime for a period of 3 days. If colored concrete is described and you use the curing compound method, apply curing compound no. 6. 72-3.04 PAYMENTIf concreted-rock slope protection is paid by the ton, the payment quantity is the weight determined from scale weightings. If concreted-rock slope protection is paid by the cubic yard, the payment quantity is the volume determined from the dimensions shown or ordered. 72-4 SMALL-ROCK SLOPE PROTECTION 72-4.01 GENERALSection 72-4 includes specifications for constructing small-rock slope protection. 72-4.02 MATERIALSRock must be cobble, gravel, crushed gravel, crushed rock, or any combination of these. If the rock layer is shown as 7 inches thick, comply with the gradation requirements shown in the following table:
If the rock layer is shown as 5 inches thick, comply with the gradation requirements shown in the following table:
If the rock layer is shown as 4-inches thick, comply with gradation requirements shown in the following table:
Granular material must contain at least 90 percent crushed particles when tested under California Test 205. Directory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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