1. Shima Barezi, Mahmud Vafaian, Seyed Mehdi Abtahi, "Study of physical and mechanical properties of a sandy soil improved with water soluble polymers", Bratislava, Slovak Republic, June 2 – 4, 2010, (18296).
2. Hossein Matinmanesh, Sayyed Mahdi Abtahi, Ajalloeian Rassoul, Mohammadali Rowshanzamir, "Effect of Acrylic Resin Injection on Improvement of Compressive Strength and Elastic Modulous of Grouted Sand", Bangladesh Geotechnical Conference 2010: Natural hazards in geotechnical engineering, 2010, DHAKA, (24289).
3. Sayyed Mahdi Abtahi; Mahmud Ameri; Mohammad Sheikhzadeh; Sayyed MAHDI Hejazi; Esmael Rahnama, "A Comparative Study on the Use of SBS Polymers and Poly Propylene Fibers Modifying Asphalt Concrete Structures", 8th International Conference on Sustainable aggregates, asphalt technology and pavement engineering, February 2009, Liverpool, UK, (14593).
4. Sayyed Mahdi Abtahi; Fatemeh Ebadi Ahsan; Sayyed Mahdi Hejazi; Mohammad Sheikhzadeh, "On The Use Of Textile Fibers To Achieve Mechanical Soil Stabilization", 4th International Textile, Clothing & Design Conference - Magic World of Textiles, October 05th to 08th 2008, DUBROVNIK, CROATIA, (13149).
5. Sayyed MAHDI Abtahi, Mohammad Tamanaie, Shahab Kermanshahi, Alireza Abrishamkar, Determination Of The Highway Capacity Based On Time Headway Analysis (Case Study: Isfahan Highways), 2011 international conference on traffic and transportation engineering, Dubai, UAE, 2011, (20749)
6. M. M. Kunt, M. Ebrahimi, S. Esfandiarpour, S. M., Abtahi Forooshani, The Effect Of Polypropylene Additive On Asphalt Mixture Properties, 9th International Congress on Advances in Civil Engineering, 27-30 September 2010, Karadeniz Technical University, Trabzon, Turkey(18295).
7. Sayyed MAHDI Abtahi, Kiachehr Behfarnia, Sayyed Ahmad Reza Hejazi, Application of Polypropylene Fibers in Pervious Concrete Pavement, International Conference on Transport infrastructures – iCTi2010, São Paulo, Brazil, 4 - 6 August, 2010, (19893).
8. Neshat Okhovat, Reza Porhoseini, Seyed Mehdi Abtahi, Sayyed Mahdi Hejazi, Improvement Of Soil Strength By Natural Fibers, From Research to Design in European Practice, Bratislava, Slovak Republic, June 2 – 4, 2010 (18293)
9. Sayyed MAHDI Hejazi, Sayyed MAHDI Abtahi, Mohammad Sheikhzadeh, Dariush Semnani, " Using an Artificial Neural Network (ANN) for the Investigation of some Fiber Parameter Performances in Fiber Reinforced Asphalt Concrete (FRAC)", 7th International Conference on Sustainable aggregates, asphalt technology and pavement engineering Wednesday 20 and Thursday 21 February 2008, Liverpool, UK, (11416).
10. Sayyed MAHDI Abtahi, Mohammad Sheikhzadeh, Sayyed MAHDI Hejazi, Reza Alipour, "Physical and Mechanical Properties of Bitumen Reinforced with Poly Propylene Fibers", the 1st International and the 7th National Conference on Textile Engineering -October 2009- Rasht, Iran, (15809).
11. Sayyed MAHDI Abtahi, Mohammad Sheikhzadeh, Sayyed MAHDI Hejazi, Younes Hassani, Compressive Behavior of Composite Soils Reinforced with Recycled Waste Tire Cords and Poly Propylene Fibers, The 1st International and the 7th National Conference on Textile Engineering -October 2009- Rasht, Iran, (15823).
12. Sayyed MAHDI Abtahi, Neshat Okhovat, Sayyed MAHDI Hejazi, Using Textile Fibers as Soil Stabilizers – New Achievements, The 1st International and the 7th National Conference on Textile Engineering -October 2009- Rasht, Iran, (16117).
13. Sayyed MAHDI Abtahi, Reza Khodadadi, Saeed Puladsaz, Ehsan Tavakkol, Sayyed MAHDI Hejazi, "On the Reinforcement of Steel-Slag Asphalt-Concrete Structures Using Poly Propylene Fibers", the 1st International and the 7th National Conference on Textile Engineering -October 2009- Rasht, Iran, (16118).
14. Amirhosein Momeni, Sayyed Mahdi Abtahi, Hamidreza Safavi, Mansor Shisheforosh, "A New Approach for Identification and Priorities of Accident Prone Points in Suburban Transportation Networks", 9th International Congress on Civil Engineering, 2012, Isfahan, Iran, (23515).
15. Majid Amuchi, Sayyed Mahdi Abtahi, Behrooz Koosha, "technical and economic analysis of using steel slag SS aggregate in pavement engineering", 9th International Congress on Civil Engineering, 2012, Isfahan, Iran, (23977).
16. Sharbaf, Mohammadreza, Abtahi, Sayyed Mahdi, Amini, Danial, Sedaghatdoust, Arash, Investigating the Influence of Microsilica on Strength and Durability Properties of Structural Lightweight Concrete and the Economic Feasibility of Such Concrete, Fourth International Conference on Concrete and Developement, At Tehran, Iran,2013