Dadang Iskandar
@ummetro.ac.id
Civil Engineering Department, Faculty of Engineering
Universitas Muhammadiyah Metro
RESEARCH INTERESTS
Civil Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scopus Publications
Dadang Iskandar, R. Jachrizal Sumabrata, Eri Prawati, Yusuf Amran, and M. Nurkholid
Horizon Research Publishing Co., Ltd.
Sigit Pranowo Hadiwardoyo, R. Jachrizal Sumabrata, Atica Chairun Nissa, Farras Ammar Muhammad, Masjulina Hia, Dadang Iskandar, and Riana Herlina Lumingkewas
Springer Science and Business Media LLC
Dadang Iskandar, Ida Hadijah, Sigit P. Hadiwardoyo, Novia Lumintu Wati, and Septyanto Kurniawan
Horizon Research Publishing Co., Ltd.
R. Jachrizal Sumabrata, Dadang Iskandar, and Radhitya Abiyoga
Horizon Research Publishing Co., Ltd.
Dadang Iskandar, R. Jachrizal Sumabrata, and Radhitya Abiyoga
Horizon Research Publishing Co., Ltd.
The diversion of people towards public transportation has become the main focus of the Central Government and this involves rearranging the areas traversed by mass transportation corridors through the concept of transit-based integration known as the Transit-Oriented Development (TOD) in order to overcome congestion problems in Greater Jakarta, especially the Jakarta area. However, these plans have raised concerns on the ability of the transit-oriented area to fully accommodate the TOD concepts and principles or just to serve as only a part of the property business owned by several parties. The implementation of the concept is also not optimal due to the lack of an appropriate tool to identify the readiness of an area to be developed into a transit-oriented area by the government and the actions required to unlock the potentials of the development. This research, therefore, used 22 indicators to determine whether an area fulfills the transit-oriented elements and the factors required for its preparation. This involved using literature studies to produce research variables after which a survey was conducted and tested for validity and reliability by the drafter, academics, experts, and practitioners. The indicators were developed into an assessment instrument consisting of 5 parts to represent the research variables and other 23 questions.
S P Hadiwardoyo, R H Aryapijati, R J Sumabrata, and D Iskandar
IOP Publishing
Abstract The use of materials for the construction of roads can be done by recycling asphalt concrete mixtures that have reached fatigue or aging conditions. The results from stripping the asphalt concrete layer on the surface layer can be reused after processing by recycling the material. The recycling process is often intended to preserve the environment from natural damage due to the processing of material for asphalt concrete mix. To improve the performance of the recycled mixture, additives have been widely used and the use of building materials as additives can also be obtained from building material waste. One of the waste that continues to increase is the waste of vehicle tires. In this research used tire waste that has been mashed up to Nano size. The use of finer used tire sizes is intended to facilitate the process of mixing with asphalt. Recycling performance of hot mix asphalt concrete on deformation performance has been used rutting test using Wheel Tracking Machine at a temperature of 27°C, 40°C and 60°C. The test results showed a decrease in the rate of deformation in the asphalt concrete recycle mixture using Nano crumb rubber added material.
S L Annisa, S P Hadiwardoyo, R J Sumabrata, and D Iskandar
IOP Publishing
Abstract Stripping the road surface layers of asphalt concrete caused by various considerations that have been damaged by the aging process of asphalt. This stripping material will continue to grow in sufficient quantities if the recycling process is not utilized. The recycling process can be done by restoring the performance of asphalt or aggregate and can even occur both to meet the specifications required originally. In this research, asphalt concrete mixture has been used where the asphalt element has undergone an aging process so that it needs to be rejuvenated or softened. The addition of used oil has been used in the process of softening the hot Asphalt Concrete Wearing Course (ACWC) type. The process of increasing the performance of recycled blends has used Nano Crumb Rubber (NCR) material. The test results show that the ratio of the old asphalt content and used oil as a softener is obtained with a ratio of 11: 4 to obtain the required level of softening. This composition has produced a bitumen penetration value of 60, and the addition of NCR 2.5% and 5% to the asphalt content. Testing for recycled asphalt mixes is carried out with Marshall Test, Indirect Tensile Strength (ITS), and water absorption testing for recycled mixtures for paving blocks. The test results show the addition of NCR by the dry method has increased the strength of the mixture at both ambient and higher temperatures of 35 °C and 45 °C.
Sigit P.Hadiwardoyo, Oliver Senawibowo, R. Jachrizal Sumabrata, and Dadang Iskandar
Horizon Research Publishing Co., Ltd.
As the number of vehicles increases, the increasing number of used tires becomes an important issue, which needs to be handled so as not to become waste. One method that has been widely used is to process used tires into Crumb Rubber which in the field of road pavement can be utilized as added material. Hot mix asphalt concrete has a service life based on the mixture's mechanical strength, but its slip resistance is another important thing. The slip resistance is influenced by the composition of asphalt concrete aggregate as well as temperature. The increase of asphalt concrete mixture, whose content will experience an increase in temperature, will decrease the value of its slip resistance because asphalt becomes softer, which will result in a decrease in the bonding ability between asphalt and aggregate. Crumb Rubber is refined into Nano-sized particles in hot mix asphalt concrete. The percentages of Nano Crumb Rubber used in asphalt content are 0%, 2.5%, and 5% by using the dry process method. This skid resistance test is performed by using a British Pendulum Tester and carried out under various temperature conditions, 26 ℃, 30 ℃, 35 ℃, 40 ℃, and 45 ℃. Test results have shown that at normal temperature (25 ℃) asphalt modification is smaller than the asphalt mixture of virgin asphalt. However, at temperatures above 40 ℃ the opposite occurs, especially in the addition of 2.5%. The addition of Nano Crumb Rubber 2.5% has reduced the effect of high temperature more than 40 ℃ on the asphalt mixture.
Sigit P. Hadiwardoyo, Fatih Nurahman P. Imansyah, R. Jachrizal Sumabrata, and Dadang Iskandar
Horizon Research Publishing Co., Ltd.
The pavement construction is designed by considering the factor of resistance to deformation due to the repetition of wheel loads. Other factors are the influence of the wheel load, the condition of the increase in temperature on the road surface, which is the cause of the decrease in the strength of the road surface layers. The deformation of the road surface due to wheel tracks occurs when an increase in tensile stress at high temperatures due to wheel loads occurs. The relationship between the number of wheel tracks and permanent stresses that occur on the road surface can be known to be analyzed through the wheel tracking test. This study aims to determine the effect of the addition of nano-sized use of rubber tires on increasing the resistance of hot mix asphalt to the effect of temperature due to vehicle wheel loads. This use of tire waste has been processed to nano-sized granules called nano crumb rubber; this material is added to the Asphalt Concrete Wearing Course hot mix asphalt. This material addition of 0%, 1.25%, 2.5%, 3.75%, and 5% of the asphalt content in hot mix asphalt. The Nano Crumb Rubber is added to the aggregate at the mixing temperature 130℃, before mixing the aggregate with asphalt. The optimum asphalt content is obtained through a Marshall standard test; the research is continued by conducting the Wheel Tracking Machine test. The results of the test found that the addition of Nano Crumb Rubber in the asphalt mixture will improve the quality of the mixture, especially at high temperatures, increase the quality of the addition of 1.25% and continue the addition of 5%. However, the addition of Nano Crumb Rubber > 1.25% decreased performance due to high temperatures. The test results at 40℃ and 60℃ with the addition of 1.25% are the hot mix asphalt with the best performance. The use of Nano Crumb Rubber in hot mix asphalt requires a smaller amount compared to Crumb Rubber.
D Iskandar, S P Hadiwardoyo, R J Sumabrata, and M Fricilia
IOP Publishing
Abstract One of pavement deterioration causes is the lack of road drainage maintenance. Road drainage system has a function to dry the pavement thus water can flow as quickly as possible out of the road surface and then flow through the channel to the final disposal. Road distress will interfere the comfort and safety ride and affect the pavement structure performance and quality. This research aims to identify and analyze the influence of drainage conditions through road pavement structures distress using Pavement Condition Index (PCI) method in Jakarta. The method used is a field research with primary data in the form of road distress survey that will be evaluated using PCI and analyzed using factorial experiment design. The research results using Design of Experiments shows that the main factors which greatly influence the road distress is drainage conditions, PCI score and surface water condition. Most of the surveyed region has a “good” PCI score and “routine maintenance” type.
Dadang Iskandar, Sigit Pranowo Hadiwardoyo, Raden Jachrizal Sumabrata, and Hendra Ariyapijati
AIP Publishing
This paper presents the results of the application of non-destructive test: Falling Weight Deflectometer (FWD) to assess the bearing capacity of the rigid pavement and calculate the overlay on a composite pavement. The present study was conducted on toll roads in Jakarta Outer Ring Roads S-section (JORR-S), with vehicles lane that received relatively heavy axle loads. The main motivation of this research was to evaluate the use of FWD method against destructive testing (DT)—which is relatively time-consuming, unsafe and costly—as the support for decision making in carrying out effective and efficient toll road maintenance. The structural models were build based on the deflection of the FWD and the real traffic load measured using Weigh in Motion (WIM) data. The layers elastic moduli were estimated through back-calculation. Furthermore, the calculation of thickness overlay with bearing capacity values from the non- destructive test data was done using back calculation method. The final calculation results obtained the average thickness of the overlay of 8 cm. It can be concluded that the thickness of the pavement layer has a high influence on the approximate modulus of the bitumen layer to be added. Although the results are specific to this case, it is expected that this study will strengthen the importance of using non-destructive testing for pavement evaluation.This paper presents the results of the application of non-destructive test: Falling Weight Deflectometer (FWD) to assess the bearing capacity of the rigid pavement and calculate the overlay on a composite pavement. The present study was conducted on toll roads in Jakarta Outer Ring Roads S-section (JORR-S), with vehicles lane that received relatively heavy axle loads. The main motivation of this research was to evaluate the use of FWD method against destructive testing (DT)—which is relatively time-consuming, unsafe and costly—as the support for decision making in carrying out effective and efficient toll road maintenance. The structural models were build based on the deflection of the FWD and the real traffic load measured using Weigh in Motion (WIM) data. The layers elastic moduli were estimated through back-calculation. Furthermore, the calculation of thickness overlay with bearing capacity values from the non- destructive test data was done using back calculation method. The final calculation results ...
Restu Alan Suyuti, Raden Jachrizal Sumabrata, Sigit Pranowo Hadiwardoyo, and Dadang Iskandar
AIP Publishing
Sustainable development is one of the major subjects that must be considered in the development process. One primary concept of sustainable development is recycling of materials that have been used to minimize the use of resources. The objective of this study is to utilize reclaimed asphalt pavement (RAP) as a mixture of new asphalt formations in the recycling process. Experiments on RAP material were used in the condition of warm asphalt mixture (WMA) with the addition of retona asbuton to the mix of Asphalt Concrete-Wearing Course (AC-WC) which would be tested with Marshall Test. Zeolite of 1% and 1.5% were added to each variation of asphalt content ranging from 5%; 6%; and 7%. The result of the recycled aggregate asphalt mixture was tested with Marshall Standard on the optimum Asbuton-R content. The mixing process was performed at warm temperatures to reduce fuel usage as well as carbon emissions produced. This research also utilized Retona asbuton which is a native product in the country. It also used zeolite which was not difficult to obtain in Indonesia. This would increase the potential of materials in the state. In this study, the analysis was carried out using a factorial design to obtain the optimum level of retona asbuton mixture with RAP used in the warm mixture. Evaluation would also be carried out on the effect of RAP on a mixture of AC-WC properties. The best mixture results were obtained, namely RAP content of 49.37% with 7% asphalt content where the addition of new asphalt was only 4.13% of the total mixture.Sustainable development is one of the major subjects that must be considered in the development process. One primary concept of sustainable development is recycling of materials that have been used to minimize the use of resources. The objective of this study is to utilize reclaimed asphalt pavement (RAP) as a mixture of new asphalt formations in the recycling process. Experiments on RAP material were used in the condition of warm asphalt mixture (WMA) with the addition of retona asbuton to the mix of Asphalt Concrete-Wearing Course (AC-WC) which would be tested with Marshall Test. Zeolite of 1% and 1.5% were added to each variation of asphalt content ranging from 5%; 6%; and 7%. The result of the recycled aggregate asphalt mixture was tested with Marshall Standard on the optimum Asbuton-R content. The mixing process was performed at warm temperatures to reduce fuel usage as well as carbon emissions produced. This research also utilized Retona asbuton which is a native product in the country. It also used...
Dadang Iskandar, Sigit Pranowo Hadiwardoyo, and Raden Jachrizal Sumabrata
IOP Publishing
The cover layer of the pavement can be functioned as a structural layer or non-structural layer. Improvement of road surface conditions is done by overlay with additional layers above it or stripping the surface layers of the road. Reclaimed Asphalt Pavement (RAP) or asphalt stripping results into a new problem of aggregate asphalt waste. Utilization of material from the pavement surface layer can reduce environmental pollution and can save maintenance cost. Research has been done by knowing the content of asphalt and gradation of aggregate from stripping asphalt through the extraction process. A few modified asphalts as Asbuton Retona Blend-55 (Asbuton-R) and fresh aggregates have been added to obtain the aggregate bitumen mixture on the specification type of Asphalt Concrete Wearing Coarse (ACWC) mixture. Crumb Rubber (CR) of used tire rubber has been added to the new aggregate and mixed with the old asphalt mixture, and then added asphalt modified Asbuton-R. Crumb rubber (CR) of 0.5%, 1%, 1.5% and 3% were added to each variation of asphalt content ranging from 1.5%; 2%; and 4%. The result of the recycled aggregate asphalt mixture was tested with Marshall Standard and Marshall Immersions on the optimum Asbuton-R content. The deformation resistance of pavement mixture to weather changes has been simulated using Wheel Tracking Machine (WTM) at 26° C, 30° C, 35° C. The results showed that RAP content of more than 80% can still be utilized in the recycling process. The asphalt pavement mixture resistance to rutting deformation due to temperature change, with the addition of 1.5% of optimum Asbuton-R content has shown an increase.
Dadang Iskandar, Sigit Pranowo Hadiwardoyo, Raden Jachrizal Sumabrata, and Ika Nur Fitriasari
Author(s)
One of the causes of road deterioration is inundation due to poor drainage conditions. Delays of repair will only exacerbate the distress of road and increase the maintenance costs. This study aimed to determine the pavement maintenance cost for outer ring road of Universitas Indonesia using Life Cycle Cost Analysis (LCCA) method and to determine the most cost-effective maintenance strategies based on the analysis of pavement performance. Based on three pavement maintenance scenarios, the result showed that the most cost-effective maintenance strategy is the first scenario, namely pavement maintenance every two years, with the lowest value of Net Present Value (NPV) of IDR 23,490,602.00. The comparison of NPV values showed the potential reduced cost of IDR 18,826,750.00 from pavement maintenance budget using overlay if the first scenario strategy is implemented.One of the causes of road deterioration is inundation due to poor drainage conditions. Delays of repair will only exacerbate the distress of road and increase the maintenance costs. This study aimed to determine the pavement maintenance cost for outer ring road of Universitas Indonesia using Life Cycle Cost Analysis (LCCA) method and to determine the most cost-effective maintenance strategies based on the analysis of pavement performance. Based on three pavement maintenance scenarios, the result showed that the most cost-effective maintenance strategy is the first scenario, namely pavement maintenance every two years, with the lowest value of Net Present Value (NPV) of IDR 23,490,602.00. The comparison of NPV values showed the potential reduced cost of IDR 18,826,750.00 from pavement maintenance budget using overlay if the first scenario strategy is implemented.