Home > Documents > Granular Materials

Granular Materials

Date post: 01-Jun-2018
Category:
Author: mohd-qazar-yusop
View: 212 times
Download: 0 times
Share this document with a friend
Embed Size (px)
of 16 /16
NAME ID MOHD AMIRRUL CE089378 MOHD HAZIQ CE089412  AHMAD NAJMUDDIN CE090834 NUR F ARAHID A CE089364 SITI F AIZAH CE089382
Transcript
  • 8/9/2019 Granular Materials

    1/16

    NAME ID

    MOHD AMIRRUL CE089378

    MOHD HAZIQ CE089412

    AHMAD NAJMUDDIN CE090834

    NUR FARAHIDA CE089364

    SITI FAIZAH CE089382

  • 8/9/2019 Granular Materials

    2/16

    INTRODUCTION It is one or more layers of material paced immediately

    above sub-grade or capping

    Together with capping, the unbound pavement coursecomprises the road foundation ensuring that thecourses above are adequately supported so that theirfull potential is achieved.

  • 8/9/2019 Granular Materials

    3/16

    THE UNBOUND PAVEMENT

    BASE

    COURSE

    SUB-BASE

    COURSE

  • 8/9/2019 Granular Materials

    4/16

    BASE COURSE Help to distribute the load

    Depth is the main factor considered in design

    Must not be a cause of failure Strong enough to carry the load without shear failure

    and resultant rutting

    Must allow water drainages

    Must be durable

    The material such as crushed stone, crushed oruncrushed slag, crush or uncrushed gravel & sand.

  • 8/9/2019 Granular Materials

    5/16

    The material shall are as

    requirement: The plasticity index shall be not more than 6

    The aggregated crushing value shall be not more than 30

    The flakiness index shall be not more than 30

    Not less than 80% of particles on the B.S 4.75mm sieveshall have at least one fractured face.

    The weighted average loss of weight in the sodium suphatesoundness test(5 cycles)shall not more than 12%

    The material shall have a CBR value of not less than 80when compacted to 95% of the maximum dry density

    The gradation shall comply with the envelope shown intable 2.1 for type specified.

  • 8/9/2019 Granular Materials

    6/16

  • 8/9/2019 Granular Materials

    7/16

    THE TESTING CALIFORNIA BEARING RATIO (CBR)

    PLASTICITY INDEX (PI)

    AGGREGATE IMPACT VALUE (AIV) FLAKINESS INDEX (FI)

    SOUNDNESS

    SIEVE

  • 8/9/2019 Granular Materials

    8/16

    SUB-BASE COURSE Must drain readily

    Subjected to the much smaller loads

    Requirements for sub-base materials are usually givensin terms of the gradation, plastic characteristic andstrength

  • 8/9/2019 Granular Materials

    9/16

    The function of sub-base are: To sustain road base layer and distribute load from the

    vehicle

    Act as a drainage layer Can be used as a temporary road during construction

    To protect the sub-grade from the failure due to theclimate effect

    As a barrier layer to avoid the mixing of sub-grade androad base materials.

  • 8/9/2019 Granular Materials

    10/16

    Testing The liquid limit shall be not more than 25% The plasticity index shall be not more than 6% The aggregate crushing value shall be not more than 35%

    The material shall have a CBR value of 30 or more whencompacted to 95% of the maximum dry density The gradation shall conform to one of the envelopes shown in

    table 2.2 with the fraction passing the B.S 75 um sieve not greaterthan 2/3 of the fraction passing the B.S 425 um sieve.

    Laterite sand-which have CBR value 20% Crushed aggregates-with the size ranging from 75mm to dust

    and the CBR value 10 30% Sub-base material should fullfill the test of CBR, liquid limits,

    plastic limits, aggregate impact value (AIV), Los angeles abrasion(LAA) and sieving.

  • 8/9/2019 Granular Materials

    11/16

  • 8/9/2019 Granular Materials

    12/16

    Granular material picture

  • 8/9/2019 Granular Materials

    13/16

  • 8/9/2019 Granular Materials

    14/16

  • 8/9/2019 Granular Materials

    15/16

  • 8/9/2019 Granular Materials

    16/16


Recommended