subgrade material youtube

Subgrades & Subbases for Concrete Slabs - Concrete Network

The type of soil (or subgrade material) determines the type of equipment needed for compaction: Cohesive soils need to be sheared to get compaction, so you need a machine that has high impact force. A rammer is the best choice, or for bigger jobs, a pad-foot roller (similar to a sheepsfoot roller). Lifts for compaction of cohesive soils should ...

Proper Subgrade Prep| Concrete Construction Magazine

The measured density of the subgrade material for a residential application should be 90% to 95% of the Standard Proctor Density. This density can be achieved using a combination of three to four passes with a vibratory plate compactor or rammer, in …

Characteristics of sub-ballast and subgrade materials ...

The presence of a geotextile separator avoids or minimize the contamination of the good quality base or ballast material with fines from the subgrade, increasing the life of the road and reducing ...

Subgrade Design and Construction

factors involved when evaluating subgrade materials (such as swell in the case of certain clays), stiffness is the most common characterization and thus CBR, k-value, and resilient modulus are discussed here. 1. California Bearing Ratio (CBR): The CBR test is …

Modulus of Subgrade Reaction of Soils - Structville

k s = q/δ ——- (1). Where; k s = Coefficient of subgrade reaction expressed in force/length 2 /length q = pressure on the surface at the given point δ = settlement at the same point. Against many popular opinions, the modulus of subgrade reaction is not an exclusive property of soil but depends mainly on the loaded area (size of the footing or mat).

Tests on Subgrade Soil - Highway Material - youtube.com

Subject - Transportation Engineering 1Video Name - Tests on Subgrade SoilChapter - Highway MaterialFaculty - Prof. Pranay PadadeWatch the video lecture on To...

CHAPTER 3: SUBGRADE, SUBBASES, and BASES

Before adding lime, the subgrade material to be treated is scarified, pulverized, mixed, and windrowed or re-laid. It may be necessary to remove oversize material (see Standard Specification Subsection 301-3.01). Windrows should be sized so that the mixer can easily process all the material at once. This may mean that several windrows will be ...

Module 3.1 (Classification of Soil) Geotechnical ...

CLASSIFICATION OF HIGHWAY SUBGRADE MATERIALS FOR GRANULAR MATERIALS (AASHTO) [A-1 to A-3] CLASSIFICATION OF HIGHWAY SUBGRADE MATERIALS FOR SILT-CLAY MATERIALS (AASHTO) [A-4 to A-7] Range of LL and PI for soils in Groups A-2, A-4, A-5, A-6 and A-Group index Group index is used to evaluate quality of a soil as a highway subgrade material

Cement soil stabilization-1/1 - YouTube | Soil ...

Apr 22, 2017 - This video contains lab and field demonstrations of the stabilization of subgrade soils and a discussion of field inspection practices. ... family, and the world on YouTube. ... Natural Homes. Mud, glorious mud: Homes made of earth. Warm in winter and cool in summer, earth is the perfect material for green construction. No wonder ...

MATERIAL SPECIFICATION FOR AGGREGATES - BASE, …

1010.05 MATERIALS . 1010.06 EQUIPMENT - Not Used . 1010.07 PRODUCTION . 1010.08 QUALITY ASSURANCE . 1010.09 OWNER PURCHASE OF MATERIAL - Not Used . APPENDICES . 1010-A Commentary . 1010.01 SCOPE . This specification covers the requirements for granular aggregate materials for use in subgrade, subbase,

Subgrade | Steps For Preparation Of Subgrade ...

Loosening and compaction of the original ground/subgrade up to the required depths as directed by the Engineer. Construction of subgrade layer with the help of approved borrow area material, including all leads and lifts, completed. Construction of road subgrade with suitable approved material available from the roadway excavation or any other ...

Modulus of Subgrade Reaction - Geo Hydro Engineers

The magnitude of (k) typically ranges from about 100 to 250 pci, sometimes higher, depending on the subgrade materials and conditions. Additionally, the modulus of subgrade reaction used for design (effective modulus of subgrade reaction) can be enhanced by using a …

Pavement Manual: Treated Subgrade and Base Courses

Anchor: #i1013771 Section 4: Treated Subgrade and Base Courses Anchor: #i1048902 4.1 General. Frequently, local base and subgrade materials do not meet the material and engineering properties required for good pavement foundation performance.

Difference between Subbase and Subgrade

Heavier is the loads coming over the subgrade, higher is the thickness of the subgrade. A thickness of 12 inch or more can be expected for normal highway pavement. Compared to other surface material, the cost of subgrade material is less. The subgrade material can be improved when it do not have adequate load bearing strength.

Subgrade Preparation

2 Types of subgrade preparation Modification and Stabilization Removal and Replace Modification and Stabilization Subgrade treatment that is intended to provide a stable working platform during construction. –Adding chemicals like fly ash or cement

Physical stabilization of expansive subgrade soil using ...

This paper illustrates application of a locally produced geogrid material for strength improvement of expansive subgrade soil. Samples of black, soft soil predominating the study area were collected from south western parts of Modjo town, inside the rift valley region of central parts of Ethiopia. X-Ray diffraction as well as index property tests were executed to identify and categorize the ...

IMPORTANCE OF SUB GRADE PREPARATION FOR HIGHWAYS/ ROADS

The general principle is to replace poor load-bearing in situ subgrade with better load-bearing fill. Typically, 0.3 - 0.6 m (1 - 2 ft.) of poor soil may be excavated and replaced with better load ...

What Is Pavement | Types Of Pavement | Road Pavement ...

1. Compacted Sub-grade (150 – 300 mm) The compacted subgrade is a base of all pavement layers. All the above pavement layers transfer the stress to this layer. So, it is essential to ensure that soil sub–grade is not overstressed. Therefore, it should be properly compacted to the desired density, near the optimum moisture content. 2.

Subgrade: Properites, Advantages & Disadvantages

Introduction to subgrade: The sub-grade is made from wide range of materials, although some are much better than others. In transportation engineering, the subgrade is the basic material for construction road, pavement, or railway track. The term may also refer to imported material that has been used to build an embankment.

Webinar Lecture Series - Week 2 Subgrade and ... - youtube.com

Dr Geoffrey Jameson from the Australian Road Research Board (ARRB) delivered a series of webinar lectures on the overview of Australian flexible pavement str...

33 03a N Road Construction Sub-base and Sub-grade - YouTube

In this guide we are going to learn about the very important layers in road construction which are sub-grade and sub-base.

Standard Specifications Manual SERIES 200 - SUBGRADE AND ...

approved material as established by the Engineer or designated representative. Any deviation in the subgrade cross section which exceeds 1/2 inch in a length of 10 feet (12 mm in a length of 3 meters), measured longitudinally, shall be corrected by loosening, adding or removing material, and then reshaping and compacting by sprinkling and rolling.

California Bearing Ratio(CBR Test) of Subgrade Soil ...

Originally California bearing ratio test was developed in 1929 by California division of highway for evaluating the stability of soil sub-grade and other flexible Highway Materials which was later modified by the U.S. Corps of Engineers. The abbreviation of the California bearing ratio is (C.B.R.).

Blending of Aggregates|| Trial & Error Method ... - YouTube

This video emphasis on the basics of aggregate blending and the use of Trial and Error method employed for obtaining blended mix which will further be utiliz...

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 sub-grade below. A well-constructed sub-base will aid drainage and prevent settlement and channelisation - the phenomenon common on cheap installations of block paving, where two 'ruts' develop in the paving.

Chapter 15 Construction Survey Procedures

shoulder to subgrade shoulder as a check for the slope stake notes. 15-02.3 Manual Method To find the catch point, first obtain the distance and elevation of the subgrade shoulder for a fill section, or back of ditch (BOD) for a cut section. This information is found …

Subgrade and Subbase for Concrete Slabs - The Constructor

Subgrade and subbase are the foundation of a concrete slab and play critical role in its performance. According to the ACI Code, the subgrade is a compacted and improved natural soil or brought infill whereas subbase is a layer of gravel placed on the top of the subgrade. Both subgrade and subbase shall be constructed according to design ...

Causes of Failure of Pavement |Flexible Pavement Failure ...

The localized depression may develop due to the failure of any component layer of the flexible pavement structure. Fig. 1, 2, and fig. 3 show respectively failures in flexible pavements due to failure in the subgrade, failure in base or sub-base course, and failure in wearing course.

Estimating Stiffness of Subgrade and Unbound Materials for ...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 382: Estimating Stiffness of Subgrade and Unbound Materials for Pavement Design explores the significance of the resilient modulus property, various methods of determining this property of subsoils and unbound bases, and the application of this parameter in the mechanistic ...

Pavement Design in Road Construction - Design Parameters ...

Selected materials placed on subgrade which is compacted to 98% of IS heavy compaction. Function of sub-base is to distribute the stresses over a wide area of the subgrade imposed by the traffic. Materials: CBR of 15%; Passing through 425 micron IS sieve; L.L<25 and P.I<6

Subgrade - YouTube

In transport engineering, subgrade is the native material underneath a constructed road, pavement or railway track. It is also called formation level.The ter...

Subgrades and Subbases for Slabs| Concrete Construction ...

On top of the subgrade, for most industrial slabs, a subbase is placed. Although the subbase is not mandatory, it serves as a work platform for construction of the slab and a cushion for more uniform support of the slab. Most road base material approved by the local DOT is suitable for the subbase. "We use 6 to 8 inches of crusher run ...

(PDF) CONSTRUCTION OF SUBGRADE, SUBBASE AND BASE LAYERS ...

Any soft areas in embankment, be removed and replaced by app.material, compaction Tests On Borrow Materials Of Embankment/subgrade Test Desirable Frequency / 3000 cum Gradation/ Sand Content 2 Tests Plasticity Index 2 Tests Modified Proctor Test 2 Tests CBR on a set of 3 One Test Specimens Deleterious Constituents As Required Natural Moisture ...

METHOD STATEMENT FOR SUBGRADE – The Quality Guru

The material used in subgrade shall generally be soil, moorum, gravel, a mixture of these or any other approved material. In respect of quality of material, such material shall be ensured to be free of logs, stumps, roots, rubbish for any ingredients likely deteriorate or affect the stability of the subgrade.

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