Guidelines on the selection and use of road construction ...

practices in terms of a whole road unit, including earthworks and drainage, rather than in terms of individual pavement layers. It follows that there has been a need to derive and implement design and construction procedures specifically for the tropical and sub-tropical regions. Overseas Road Note 31 (ORN 31), which is now

(PDF) CONSTRUCTION OF SUBGRADE, SUBBASE AND …

CONSTRUCTION OF SUBGRADE, SUBBASE AND BASE LAYERS Dr. Anjaneyappa Department of Civil Engineering RV College of Engineering Bengaluru – 59 Email: [email protected] Pavement Types Flexible pavements Rigid pavements / Cement Concrete (CC) Pavements Semi-rigid pavements Composite pavements Pavement …

CHAPTER 3: SUBGRADE, SUBBASES, and BASES

Blending or selection of material from various areas of the source may be required. The Resident Engineer cannot direct that a Contractor furnished source be worked in a particular manner, but can advise the Contractor when the methods or materials may not produce an acceptable product. Comments of this type should be supported by test results.

Subgrade | Steps For Preparation Of ... - Construction Civil

The material at the site is too Wet: If the material at the site is too wet, it shall be dried by aeration and exposure to the sun until the moisture content is acceptable. When a combination of grader and dozer is used, the dozer shall carry out the initial spreading of borrowed material to the approximate line and level.

SUB-BASE AND ROAD-BASE - Method Statement HQ

METHOD STATEMENT SUB-BASE AND ROAD-BASE Ref. No. : 02/11/MC/14/00-01 Revision No. : 1.0 Revision Date : 1/11/2002 2.3 Placing of Road Base or Wet Mix Macadam 2.3.1 The material shall be laid using an approved machineries and compacted in layers in accordance with specification. Any areas of

IC-QA-3051 - Granular Pavement Base and Subbase …

a Base material. However, higher standard materials can be expected to be more expensive. Note that higher standard materials, or materials with higher plasticity, will generally have lower permeability, and the substitution of a lower standard material in the subbase with a higher standard

Standard Subgrade and Base Construction

the material fails to meet the density specified, it shall be reworked as necessary to obtain the density required. Prior to placement of any base materials, the in-place density and moisture content of the top6 inches (150 mm) of compacted subgrade shall be checked. If …

Sub-bases | Pavingexpert

The sub-base layer is often the main load-bearing layer of a pavement. It is designed to evenly spread the load of the paving, and any traffic thereon, to the …

AGGREGATE BLENDING, ABSORPTION, & SPECIFIC …

Aggregate Blending, Absorption & Specific Gravity 31 Blending of Aggregates Material Aggregate Aggregate No. 1 No. 2 Blend Target % Used Sieve % Passing % Batch % Passing % Batch 3/8 100 100 100 No. 4 90 100 90 to 100 No. 8 30 100 36 to 76 No. 16 7 88 No. 30 3 47 No. 50 1 32 No. 100 0 24 No. 200 0 10 2 to 10 30.0% 70.0% 30.0% 70.0%

GUIDELINES FOR SOIL AND GRANULAR MATERIAL …

Base/Sub-base in Pavement Construction" All these guidelines were reviewed and it was found that IRC-33, 49, 50, 51 and 88 are related to soil stabilization with admixtures. However, IRC-28 deals with soil and soft aggregates stabilization. The revised guidelines presented through this document encompass the review of

Building Roads over Swamps - Bright Hub Engineering

Building Roads Over Swamps. Building roads in challenging terrain and swamps or bogs requires special attention compared to construction in ordinary soil. Swampy or marshy lands are periodically or permanently …

Granular Sub-base (GSB)-Specification and construction ...

Granular Sub Base. Granular Sub-base (GSB) consists of laying and compacting well graded material on prepared sub-grade in accordance with the specifications.: GSB layer is intermediate layer in between Sub-grade and Wet mix macadam. GSB layer is laid in roads and higway works due to its properties .

MATERIAL SPECIFICATION FOR AGGREGATES - BASE, …

MATERIAL SPECIFICATION FOR . AGGREGATES - BASE, SUBBASE, SELECT SUBGRADE, AND BACKFILL MATERIAL . TABLE OF CONTENTS . ... Road Sample means a random sample taken from road construction after placement and spreading of the ... test methods identified herein. Aggregates shall be clean, hard, durable particles and shall be produced from material ...

WORKING METHOD STATEMENT OF GRANULAR SUB …

Granular-Sub-base is often used as subbase layer of the pavement . The main role of this layer is to spread evenly the load over the subgrade .The subbase shall consist of a uniform mixture of granular material placed on a subgrade, …

Pavement Manual: Base and Subgrade Preparation

Anchor: #i1021617 Section 2: Base and Subgrade Preparation Anchor: #i1024130 2.1 Introduction. Pavement performance can be largely attributed to the care given in designing and preparing its foundation, which is comprised of the subgrade and base layers.

Road Pavement Design Guide - Kent County Council

design;( sub-base alone or sub-base plus capping layer), and one flexible design for the structural layer (unless a concrete block surface is preferred). The designer may select a different sub-base or structural layer option e.g. stabilised material or a hydraulic bound roadbase, and design information has been provided.

22 Spec - 301 Base, Subbase, and Subgrade Aggregate

Effective with the November 2021 Letting 2022 Standard Specifications [3] Required as specified for the individual component materials defined in columns 2 - 6 of the table before blending. [4] For base placed between old and new pavements, use crushed stone, crushed gravel, or crushed concrete with a plasticity index of 3 or less. [5] >=75 percent by count of …

Use of Recycled Concrete Materials in Base/Subbase ...

–Blend with aggregate if designed base requirements exceed volume of recoverable RCA base. •Minimize waste and hauling by using RCA base across full pavement section (including shoulders) when excess material is produced (e.g., 12-inch PCCP is recycled to produce material for 4-inch base layer). 30

Sub-base Layers In Road Construction | Clark & Kent ...

The sub-base layer works by distributing the surface load over a wide area, and it dramatically improves the ability of the top surface to carry heavy loads and maintain integrity notwithstanding long and repeated use.. The value of a properly laid sub-base layer, even a thin one, cannot be overestimated. Just a few centimetres of crushed aggregate can help ensure a reliable surface …

Cement stabilization of road pavement materials ...

and performance of cement-stabilized road materials. The main objectives of the project are to: Compare the chemical and physical properties of the current generation of cements with those on which TRH13 was based. Identify the implications of the range of cements that is being produced under the EN197-1 specification on road stabilization ...

FM 5-430-00-1 Chptr 5 Subgrades and Base Courses

SUBGRADES AND BASE COURSES. This chapter discusses the functions of the subgrade, subbase, and base courses and covers the selections of materials and construction procedures. Chapters 8 and 9 of ...