Ask a question from expert

Ask now

Binders for Pavement Construction

29 Pages5869 Words120 Views
   

Added on  2020-05-11

Binders for Pavement Construction

   Added on 2020-05-11

BookmarkShareRelated Documents
Running head: RESEARCH PROJECTRESEARCH PROJECTName of the StudentName of the UniversityAuthor note
Binders for Pavement Construction_1
1RESARCH PROJECTTable of Contents2.4 BINDERS FOR PAVEMENT CONSTRUCTION...............................................................32.6 Recycled Concrete Aggregates with polyethylene plastics...................................................4CHAPTER 3 MATERIALS AND METHODOLOGY..................................................................53.1 Overview................................................................................................................................53.2 Low Density Polyethylene:....................................................................................................53.2.1 Chemical Properties of Low Density Polyethylene:...........................................................63.3 High Density Polyethylene:.......................................................................................................73.3.1 Chemical Properties of High Density Polyethylene:..............................................................93.4 Low-density Polyethylene Filled with Calcium Carbonate:....................................................103.4.1 Application of Low-density polyethylene filled with Calcium Carbonate:..........................123.5 Recycled Concrete Aggregates (RCA):...................................................................................133.6 General Purpose Cement.........................................................................................................157.2 Physical properties of the material..........................................................................................163.7.2.1 Sieve Analysis...............................................................................................................163.7.2.3 Specific Gravity for Coarse Aggregates:.......................................................................183.7.2.5 PH value testing:............................................................................................................193.7.3 Testing on Mechanical Properties....................................................................................213.7.3.1 California Bearing Ratio:...............................................................................................21Relative CBR values for sub-base and sub-grade..........................................................................24
Binders for Pavement Construction_2
2RESARCH PROJECT3.7.3.2 Repeated Loaded Tri-Axial:..............................................................................................243.7.3.3 Unconfined Compressive Strength:...................................................................................27
Binders for Pavement Construction_3
3RESARCH PROJECT2.4 BINDERS FOR PAVEMENT CONSTRUCTIONTo stabilize marginal lateritic soil for building a sustainable pavement base, fly ash (FA)and calcium carbide residue has been used. These are two waste by-products and develop geo-polymer binders. Sodium hydroxide (NaOH concentration 10molars) and silicate solution(Na2SiO3) of same concentration are mixed to produce the liquid alkaline activator. Images fromscanning electron microscopy (SEM) of lateritic soil–fly ash geopolymers at distinctiveprominent parts and unconfined compressive strength (UCS) are measured. The local nationalauthorities specifies that soaked 7 day unconfined compressive strength of lateritic soil-FAgeopolymers congregates the potency required for both heavy and light traffic pavement. Thecementitious products and early 7-day UCS boost with CCR replacement ratio and the highestCCR replacement ratio tested is 30% at which these cementitious products are usually observed.At 20%, this ratio providing 3-month strength can be found. This research attempts to use CCR,which is designed for landfill traditionally, as a proponent in geopolymer binding. Fromeconomical, environmental and engineer’s point of view, this is significant to address thejustifiable usage of CCR.FA is a byproduct that has no footprint of carbon. It is a prospective stabilizer thatenhances the geotechnical and physical features for pavement aggregation. In this analysis, flyash is measured and used in different measurement in stabilizing crushed brick and recuperatingpavement for base/sub-base applications of pavement. To increase the durability and strength ofthese reused materials, FA stabilization of RAP and CB has been targeted. The development ofUCS and resilient modulus of the stabilized RAP and CB aggregates under the room temperaturehas been considered as well as an increased temperature of 40 degree Celsius. After that, theresult has been compared with unbound RAP and CB. It has been seen that the soil structure
Binders for Pavement Construction_4
4RESARCH PROJECTmatrix falls and strength is reduced by examining atomic silica content. FA was a workablebinder for stabilizing recycled CB and RAP as revealed by the MR and UCS testing. RAP andCB modified with 15% FA has shown the result of highest UCS in both 40C and roomtemperature. Higher temperature curing led to higher strengths.2.6 Recycled Concrete Aggregates with polyethylene plastics:Demolition activities generate the major municipal waste streams such as recycledconcrete aggregate (RCA) and plastic wastes. Pavement base and sub-bases demand significantamount of construction materials. Therefore, stockpiles of plastic and recycled concreteaggregate waste have budding application in road construction process. In the research, high-density polyethylene (HDPE) and low-density polyethylene (LDPE) are mixed with RCA.Including this test, other geo-technical tests such as repeated load triaxial (RLT) tests,unconfined compressive strength (UCS) and California bearing ratio (CBR) were conducted onthese blends of RCA–LDPE and RCA–HDPE. After comparing, the results derived from thetests of UCS, RLT and CBR with these quarry materials it can be understood that RCA–LDPEand RCA–HDPE is potent to be used as sustainable material in the pavement base and sub-baselayers construction. Higher CBR value can be seen in the mixture of RCA–HDPE. To markRCA–LDPE and RCA–HDPE performances under replicated traffic loads, RLT test results wereagain analyzed using resilient modulus models. Moreover, this evaluation showed that thegeotechnical nature of recycled concrete aggregate is not hampered by percentage of wasteplastic particles, which supports the idea of using the bled in pavement construction.
Binders for Pavement Construction_5
5RESARCH PROJECTCHAPTER 3MATERIALS AND METHODOLOGY3.1 OverviewIn this research, recycled concrete aggregate along with plastic particles and Cement wasused. These plastic materials were of three types, Low Density Polyethylene (LDPE), LowDensity Polyethylene and High Density Polythene (HDPE) filled with Calcium Carbonate(LDCAL).3.2 Low Density Polyethylene:Low Density Polyethylene is has been produced by heating ethylene at temperatures of100 to 300 C and high pressures (up to 3,000 bar) in the presence of free radical initiator. Thissemi-crystalline thermoplastic material can be cooled easily and looks transparent only in thinsegment. Its actual color is white opaque. It feels soft with wax like touch. Its crystallinity levelis low and the polymers densities are from 0.915 - 0.940 g/cm3 largely depending on the extenton the polymerization conditions. Both short and long chains are present. The plastic’s ease offlow is good and easy because the branched molecules of long chain are more compact. Thematerial has average tensile strength though tough.
Binders for Pavement Construction_6

End of preview

Want to access all the pages? Upload your documents or become a member.