in recent decades, economic development and population growth in the world has led to the expansion of road networks. therefore the use of optimum methods for repairing and maintenance of these roads is considered as an important value. today one of the options in this regard, is the use of asphalt recycling technology. the present study which took place in the summer of 2015 in iran, lorestan ...

Shingle material can appear as an excess usage due to defective production problems or at the end of their service life. Especially reuse shingle materials in bitumen has brought a different approach terms sustainability. In this study, utilization waste asphalt pavement were investigated. Mechanical properties hot mix and warm samples involving amount (1-6% by weight aggregate) evaluated. Foll...

Determination the optimal mix design plays an important role in order to gain the maximum characteristic strength. This research was conducted as a case study for Manjil tunnel project located in Qazvin-Rasht highway. For this purpose, 18 concrete mix designs were prepared at the study phase of the project with specifications such as conventional water-to-cement ratios of 0.4, 0.5 and 0.6, the ...

This paper presents an experimental investigation on geopolymer cement formulations for enhancing oil-well integrity. Fresh slurry properties, mixability, density, free-water, and rheology were determined possible field applications. The compressive strength expansion characteristics studied the durability integrity of well system. Mix complied with requirements API RP 10B-2. All showed homogen...

in this work an improved method for designing a linear vibrational absorber, excited by random vibrations is presented and analyzed. first, analytical expressions, for non-stationary white noise accelerations, are derived. the criterion is different from the conventional criteria, used for structural design under random vibration, and it is based on minimum displacement or acceleration response...

Despite its few inherent shortcomings, concrete has proved to be the most widely used construction material, no substitute in time still to come. In the present investigation, study of admixture of concrete was carried out. The strength of concrete depends on its mix proportions. We used so many admixture e.g. ‘silica. Fumes, fly ash etc , when we used these type of admixture the result was ver...