what is class i based course for ladotd

What is 302.01 construction?

This work consists of furnishing and placing Class II roadway and shoulder base course on a prepared surface in accordance with these specifications, in conformity with the lines, grades, thickness, and typical sections shown on the plans or established. The contractor shall control the selection, placement, mixing and compaction of materials so that the completed base course is uniform and conforms to plan dimensions and other acceptance requirements.

How many passes of a 5 to 10 ton asphalt base?

Permeable Asphalt Base:The permeable asphalt base shall be placed in accordance with Section 502. Compaction shall be with one to three passes of a 5 to 10 ton (4.5 to 9 Mg) smooth steel-wheel roller conforming to Section 503.

What is 308.01 cement?

This work consists of scarifying, pulverizing, blending, shaping and treating roadbed material with portland cement, portland-pozzolan cement, or portland blast-furnace slag cement in accordance with the lines, grades, thickness and sections established or shown on the plans.

How long does asphalt cure?

The application shall be placed immediately following smooth rolling and shall be adequately maintained during the 72-hour curing period.

What is 301.01?

301.01 DESCRIPTION. This work consists of furnishing and placing Class I Roadway and Shoulder Base Courses on a subgrade layer conforming to Section 305 in accordance with these specifications and in conformance with the lines, grades, thicknesses and typical cross sections shown on the plans or established. The contractor shall control the selection, placement, mixing and compaction of materials so that the completed base course is uniform and conforms to plan dimensions and other acceptance requirements.

What is the responsibility of a contractor?

The contractor shall be responsible for adjusting equipment to provide the approved percent of each component in the mixture at optimum moisture content. The contractor shall provide suitable equipment for the determination of moisture content, gradation, proper pulverization, and proper combination of components as required.

What is Class II base course?

Class II Base Courses are similar to Class I Base Courses, with the exception that placement on a subgrade layer built in accordance with Specification Section 305 is not required. Also, central plant mixing is not always required for cement treated Class II Base Courses. When construction is in a dust sensitive area and cement treated Class II Base Course is to be constructed, central plant requirements will be specified in the project plans. When central plant mixing is necessary or is elected by the contractor, the requirements of Class I Base Course, Specification Section 301, will apply, except that a subgrade layer may not be required.

What is DOTD TR 401?

The test procedure DOTD TR 401 - The Determination of In-Place Density, contains a worksheet to be used to facilitate the calculations associated with the determination of density, moisture, and pulverization. This worksheet is to be completed in conjunction with this procedure and used for these calculations. Department personnel will submit this form for acceptance testing regularly to the district laboratory for MATT system entry. The district laboratory will retain the original for inclusion in the 2059 Review. A copy of the documentation of QC tests and results shall be given to department personnel.. Theoretical dry density and optimum moisture content will be obtained from DOTD TR 415 or TR 418 test results. The percent pay for density will be completed for treated or stabilized base only. Raw base courses having density values less than the minimum required shall be recompacted until the required density is achieved. All density tests are to be recorded on the worksheet and submitted.

What is the specification for Portland cement?

The materials selected and used for asphaltic concrete and Portland cement concrete must conform to Specification Sections 501, 502, or 901. Sampling, testing, approval or other procedures shall be in accordance with the appropriate Quality Assurance manual.

What is a water truck?

Water trucks may be used to spray water over the surface of the completed base during finishing operations and to maintain moisture content only. They are not to be used to apply water directly to the base prior to or during the mixing process. Water trucks are to be equipped with spray bars which uniformly spray water across the surface and do not apply water in streams or cause water to puddle on the surface. Water trucks are used to supply water to the in-place mixer. The tank or connections with the in-place mixer are not to leak allowing water to fall directly onto the base course. All spray nozzles must be clean and functioning properly.

What is an in place mixer?

The in-place mixer is used to blend and pulverize the base material prior to the incorporation of cement. The equipment used for preliminary blending shall be capable of achieving specification requirements for the pulverization of the untreated base material.

What is cement stabilized base course?

Cement to be used for In-Place Cement Stabilized Base Course shall be delivered in sealed transports. Each transport shall be accompanied by a Cement Certificate of Delivery. It shall be the responsibility of the contractor to verify that the transports are sealed and that the seal number matches that indicated on the Cement Certificate of Delivery. Seals shall be removed and turned over to the project engineer daily.

What is the purpose of the contractor controlling the placement of base material?

The contractor shall control the placement of base material to ensure that there is sufficient material to finish the roadway and/or shoulders to plan width, thickness, grade, cross slope, and alignment.