Comparative Cost Analysis between Asphalt Pavement and Concrete Pavement in Road Construction: A Case study using Concrete grade 35

Roads and Highways are vital lifelines. Roads are needed for accessibility and for transporting of people, goods and services.  Roads are therefore needed for socio-economic purposes. This research aims at assessing the suitability of concrete grade 35 as an alternative pavement to as asphalt pavement in road construction.  The objective of the research is to carry out investment appraisal on road project undertaken using concrete pavement and asphalt pavement and to compare their lifecycle costs and their initial cost of construction. The findings were as follows; the initial cost of the asphalt pavement was cheaper than concrete pavement. In terms of lifecycle costs, concrete pavement is cheaper than asphalt pavement. Investment appraisal methods were in favour of the asphalt pavement, however the present worth was in favour of concrete pavement. This was due to the high maintenance costs of asphalt pavement. Keywords: Road, Highway, Investment Appraisal, Pavement

Greenhouse Gas Emissions from Asphalt Pavement Construction: A Case Study in China.

In China, the construction of asphalt pavement has a significant impact on the environment, and energy use and greenhouse gas (GHG) emissions from asphalt pavement construction have been receiving increasing attention in recent years. At present, there is no universal criterion for the evaluation of GHG emissions in asphalt pavement construction. This paper proposes to define the system boundaries for GHG emissions from asphalt pavement by using a process-based life cycle assessment method. A method for evaluating GHG emissions from asphalt pavement construction is suggested. The paper reports a case study of GHG emissions from a typical asphalt pavement construction project in China. The results show that the greenhouse gas emissions from the mixture mixing phase are the highest, and account for about 54% of the total amount. The second highest GHG emission phase is the production of raw materials. For GHG emissions of cement stabilized base/subbase, the production of raw materials emits the most, about 98%. The GHG emission for cement production alone is about 92%. The results indicate that any measures to reduce GHG emissions from asphalt pavement construction should be focused on the raw materials manufacturing stage. If the raw materials production phase is excluded, the measures to reduce GHG emissions should be aimed at the mixture mixing phase

Effects of double layer porous asphalt pavement of urban streets on noise reduction

AbstractRoad traffic is the major noise source that impacts the largest numbers of city dwellers. Urban traffic noise control at the source typically involves providing quieter i.e. low noise pavement and regular maintenance. The aim of this paper is to propose a double-layer porous asphalt pavement for keeping the traffic noise at a low level with good durability. It contains the top layer of fine aggregates and bottom layer of course aggregates. The noise-absorption performance of this asphalt pavement is evaluated by adjusting the parameters of the pavement structure simulated in air–solid coupled numerical models. The reduction of noise by using the newly proposed asphalt pavement is compared with those of the traditional pavements such as the thin surfacing (TSF) with small aggregates and rubberized asphalt pavement (RAP). The results from the outdoor noise tests for the double-layer porous asphalt pavement verifies the virtual pavement models and noise reduction effects in practice. This asphalt pavement is designated to lower the noise level of urban road traffic and boost the living environments of the city dwellers

PERBANDINGAN PENGGUNANAN BUTON GRANULAR ASPHALT (BGA) DAN RECLAIMED ASPHALT PAVEMENT (RAP) SEBAGAI BAHAN SUBSTITUSI AGREGAT PADA CAMPURAN ASPAL WEARING COURSE (AC-WC) DENGAN FLY ASH SEBAGAI FILLER

ABSTRAKVolume dan beban kendaraan terus bertambah sehingga diperlukan inovasi dalam pemeliharaan jalan guna mempertahankan atau menambah umur rencana jalan dalam melayani beban lalu-lintas. Overlay yang dilakukan terus-menerus akan membentuk ketebalan jalan yang tinggi, sehingga mengganggu drainase, ketinggian bahu jalan, kerb, dan median. Reclaimed asphalt pavement (RAP) adalah salah satu jenis aspal daur ulang yang didapatkan dari hasil penggarukan bahan perkerasan jalan yang sudah rusak. Penelitian ini bertujuan mengetahui perbandingan penggunaan buton granular asphalt (BGA) dan reclaimed asphalt pavement (RAP) sebagai bahan substitusi agregat pada campuran aspal wearing course (AC-WC) dengan fly ash sebagai filler. Pengujian yang dilakukan uji analisis deskriptif dengan parameter marshall yang dicari stabilitas, flow, vim, vma dan marshall quotient. Hasil penelitian menunjukkan bahwa kadar aspal optimum (KAO) pada campuran AC-WC dengan reclaimed asphalt pavement (RAP) sebagai pengganti agregat sebesar 5,25% dan AC-WC dengan reclaimed asphalt pavement (RAP) dan asbuton butir tipe BGA sebagai pengganti agregat sebesar 4,25%. Karakteristik marshall lapisan aspal beton AC-WC dengan reclaimed asphalt pavement (RAP) mempunyai nilai stabilitas 1208,64 kg , kelelehan/flow 3,3 mm, dan marshall quotient 362,59 kg/mm. Sedangkan pada lapisan aspal beton AC-WC dengan reclaimed asphalt pavement (RAP) dan asbuton butir tipe BGA mempunyai nilai stabilitas 1636,3 kg, kelelehan/flow 3,2 mm, dan marshall quotient 516,71 kg/mm. Kata Kunci: kadar aspal optimum, marshall test, aspal daur ulan

Key Points of Construction Quality Control of SMA Asphalt Pavement

Compared with ordinary pavement, SMA pavement structure not only has a good high temperature resistance to rutting and low temperature crack resistance, but also has excellent performance, such as seepage resistance, anti-skid, fatigue and durability, so it is widely used for SMA asphalt pavement and the supervision of the work also gradually standardized. In this paper, through the example of SMA asphalt pavement construction quality supervision of Sui-Yue-Zhong Expressway, the main points of SMA asphalt pavement construction quality control are introduced

DETERMINATION OF DESIGN PARAMETERS OF ASPHALT PAVEMENT BASED ON PG TECHNOLOGY

The design parameters are one of the important factors to ensure the quality of asphalt pavement design. In “Highway Asphalt Pavement Design Specification” (JTGD50-2017), the stander of China, used the asphalt mixture anti-pressure resilience modulus at a single temperature of 20 ℃ as the design metrics. However, asphalt mixture, as a sticky-bullet plastic material, shows different mechanical properties at different temperatures. China is a vast territory, and there are great differences between the high and low temperature value (m and n) of each region. Therefore, it is unreasonable to design asphalt pavement only with the asphalt mixture anti-pressure resilience modulus value at 20 ℃. Studies show that the design parameters using PG technology can improve the high temperature anti-rutting and low temperature cracking performance of asphalt pavement

Reconstruction of Asphalt Pavements with Crumb Rubber Modified Asphalt Mixture in Cold Region: Material Characterization, Construction, and Performance

Dry-processed rubberized asphalt mixture has recently attracted a lot of attention as an alternative to conventional asphalt mixtures. Dry-processed rubberized asphalt pavement has improved the overall performance characteristics compared to the conventional asphalt road. The objective of this research is to demonstrate the reconstruction of rubberized asphalt pavement and evaluate the pavement performance of dry-processed rubberized asphalt mixture based on laboratory and field tests. The noise mitigation effect of dry-processed rubberized asphalt pavement was evaluated at the field construction sites. A prediction of pavement distresses and long-term performance was also conducted using mechanistic-empirical pavement design. In terms of experimental evaluation, the dynamic modulus was estimated using materials test system (MTS) equipment, the low-temperature crack resistance was characterized by the fracture energy from the indirect tensile strength test (IDT), and the asphalt aging was assessed with the rolling thin-film oven (RTFO) test and the pressure aging vessel (PAV) test. The rheology properties of asphalt were estimated by a dynamic shear rheometer (DSR). Based on the test results: (1) The dry-processed rubberized asphalt mixture presented better resistance to cracking, as the fracture energy was enhanced by 29–50% compared to that of conventional hot mix asphalt (HMA); and (2) the high-temperature anti-rutting performance of the rubberized pavement increased. The dynamic modulus increased up to 19%. The findings of the noise test showed that at different vehicle speeds, the rubberized asphalt pavement greatly reduced the noise level by 2–3 dB. The pavement M-E (mechanistic-empirical) design-predicted distress illustrated that the rubberized asphalt pavement could reduce the IRI, rutting, and bottom-up fatigue-cracking distress based on a comparison of prediction results. To sum up, the dry-processed rubber-modified asphalt pavement has better pavement performance compared to the conventional asphalt pavement

Experimental feasibility study of using date palm oil as a bitumen Bio-Modifier in HMA pavement

This paper examines the effects of Date palm oil as a bitumen modifier on the compressive strength of bitumen and hot mixed asphalt (HMA) pavement. Date palm oil contains anti-oxidant isomers that have the potential to enhance the performance and durability of bitumen. The compressive strength test of asphalt pavement mixed with Date palm oil was performed in accordance with British Standards BS 1881: Part 116: 1983. The cube specimens of asphalt pavement were manufactured mixing with 0%, 2.5%, 5%, 7.5%, and 10% of Date palm oil out of total sample mass. The experimental results suggested that Date palm oil as a bitumen modifier reduced the compressive strength of HMA pavement. The findings of this paper urge for further experiments to understand the effects of Date palm oil on the asphalt pavements under long-term traffic load, environment and surface drainage