Properties of cationic emulsified asphalt paving mixtures

مقدم أطروحة جامعية

Saghir, Husayn Hamil

مشرف أطروحة جامعية

al-Baydani, Hasan H.
al-Mashhadani, Shakir A.

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

Cold emulsified asphalt mixture is generally a mixture that is made of emulsified asphalt with aggregate.

Emulsified asphalt is manufactured of base asphalt, emulsifier agent and water with approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to 60% water plus some minor components.

Asphalt emulsions are manufactured by the colloidal mill for mixing together of asphalt and water, dividing up and dispersing the asphalt in the water phase.

This study aims to use the cold emulsified asphalt mixtures for road construction and maintenance in Iraq as an alternative to the hot asphalt mixtures, due to its economical, practical and environmental advantages.

This study focused on testing and evaluating the emulsified asphalt material properties to be used as paving mixture.

Many variables are considered throughout the experimental program of this work, such as ;type of filler (ordinary Portland cement and limestone dust),mixing procedure ,compaction effort (75,150 and 225 blows) ,curing period (3,14 and 21 days) and temperature degrees (25°C and 60°C) for Marshall stability test.The tested properties of asphalt emulsion mixture were bulk density ,air voids, VMA, absorption, dry Marshall stability, wet Marshall stability, retained Marshall stability ,flow ,indirect tensile strength and moisture damage tests and compared with the common used specification.

Also a field case study is conducted to assess the utility of emulsified asphalt mixture for maintenance of defected asphaltic roads, and to observe the effects of environmental conditions and traffic loads on the maintained area.

The results indicate that the emulsified asphalt type cationic slow setting low viscosity (CSS-1) is very suitable with quartz type of aggregate from Al-Nibaay quarry.

From many trial mixes ,it is found that the best percentages of initial residual asphalt content to produce adequate results for coating test ,mixing ,compaction ,curing and Marshall stability were ranged from (2.5%, 3%,3.5%,4% and 4.5%), and the optimum percentage is (3.5%).

The results also indicate that the compaction procedure required to obtain air voids within allowable range (5-10) % is about 150 blows for each face for asphalt emulsion mixture Marshall Specimen.

The test results showed that the Marshall Stability and indirect tensile strength for asphalt emulsion mixtures with cement filler are higher than that for mixtures with limestone dust filler.

Also it is found that the increasing of curing period up to 21 days causes significant gain strength of asphalt emulsion mixture with cement filler, due to the continuous progress of cement hydration and water evaporation.

From the case study of using emulsified asphalt paving mixture to repair existed defected road, it is found that the repaired road needs an appropriate curing period of about (12±2) hr.

to be reopen for traffic normal use, and the performance of repaired area with mixture containing cement filler is much better than the performance of mixtures with limestone dust filler with use.

Finally, it can be concluded that the emulsified asphalt mixture is a suitable alternative mixture to the hot asphalt mixture for road construction and maintenance in Iraq.

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الأسفلت

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-420116