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In Civil Engineering (road Works), What is the importance of air void content in bituminous pavements?

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Question ajoutée par Muhammad Shakeel , CAD Design Manager , M/S zeeruk Intl.
Date de publication: 2015/02/25
Muhammad Shakeel
par Muhammad Shakeel , CAD Design Manager , M/S zeeruk Intl.

The air void content of bituminous materials is an important control parameter for the quality of bitumen being laid and compacted. If the air void content is too high, it allows for intrusion of air and water. Moreover, it also increases the rate of hardening of binders which produce premature embrittlement of pavements. In addition, too high a void content will also lead to differential compaction subject to traffic loads and result in formation of ruts and grooves along the wheel track.

 

However, a minimum amount of air void should be maintained to avoid instability during compaction process and to provide space for bitumen flow in long-term consolidation under traffic loads. A sufficient amount of air voids should be designed to make room for expansion of binder in summer and compaction by road traffic as suggested by National Association of Australian State Road Authorities (1968), otherwise bleeding and loss of stability may occur and the pavement will deform readily under severe loads.

Alex Al Yazouri
par Alex Al Yazouri , General Manager , Al Mushref Cooperative Society

A beautiful and comparative answer by Mr. Muhammad Shakeel.

No need to add. Thanks.

Ali Mohamed Ahmed
par Ali Mohamed Ahmed , site engineering , شركة مقاولات

. Yes I agree with Mr . Alex ..Answer Mr . Shakeel a successful and don't need to add .... Thank you

 

 

جعفر هندي زين السقاف
par جعفر هندي زين السقاف , "Certified trainer by the Yemeni Engineers Syndicate." , Engineers Syndicate

Agreed with colleagues answers

Muhammad Khalil
par Muhammad Khalil , Chief Engineer (Civil) , Water and Sanitation Services Mardan

Good Answer by Muhammad Shakeel. No need to add

محمد يونس
par محمد يونس , مهندس مشرف , الشركة العامة للكهرباء

I agree with Mr Mohammad in his answer 

Excellent idea and argumentation.  

Wolf Klaas Kinsbergen
par Wolf Klaas Kinsbergen , Managing Director, Designer , ingenieursbureau KB International NV

Beautiful answer mr. Shakeel

Mahmoud Zaher Tarakji
par Mahmoud Zaher Tarakji , مدير , أوال جاليري

 I agree with MR MUHAMMAD SHAKEEL . i can,t add any thing

Mohammed Abul Mansur
par Mohammed Abul Mansur , General Manager , Sanmar Properties Limited

I agree with Mr. Shakeel. No need to add anything. This answer is enough.

Utilisateur supprimé
par Utilisateur supprimé

helps in when the temperature varies due to pressure and climate.

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