Laboratory Evaluation Of Warm Mix Asphalt Influence On Theoretical Maximum Specific Gravity PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Laboratory Evaluation Of Warm Mix Asphalt Influence On Theoretical Maximum Specific Gravity PDF full book. Access full book title Laboratory Evaluation Of Warm Mix Asphalt Influence On Theoretical Maximum Specific Gravity.
| Author | : Jianhua Yu |
| Publisher | : |
| Total Pages | : 8 |
| Release | : 2012 |
| Genre | : Asphalt concrete |
| ISBN | : |
Download Laboratory Evaluation of Warm Mix Asphalt Influence on Theoretical Maximum Specific Gravity Book in PDF, ePub and Kindle
Warm mix asphalt (WMA) technology provides sufficient workability for asphalt mixtures at reduced mixing and compaction temperatures. Depending on the WMA technology, the typical temperature reduction range is 20 °C to 55 °C below hot mix asphalt (HMA) production temperatures. WMA involves chemical and wax additives that are added to an asphalt binder or incorporated through the use of foaming technology. The main advantages of WMA are reduced emissions and a reduction in combustible fuel consumption. Ongoing WMA research projects have documented some differences between HMA and WMA mixes, prompting numerous research projects that are investigating these concerns. The purpose of this research is to evaluate the volumetric properties by directly comparing laboratory produced WMA and HMA mixes. This study investigates the impact of WMA additives on the volumetric properties, specifically, the theoretical maximum specific gravity (Gmm). The Gmm testing followed the procedure of ASTM D2041. Two mix designs with HMA binder were produced, one without recycled asphalt pavement (RAP) and the other with 30 % RAP. After the mix designs were completed, no additional changes were made to account for the addition of the WMA technology. The mixes included the WMA technologies Sasobit and Advera, as well as an HMA control, for a total of six different laboratory produced mixes. Each mix was produced at 120 °C, 135 °C, and 150 °C, and each mix was oven cured for 1, 2, and 4 h. The test results were analyzed using statistical principles to determine whether differences in the Gmm values were statistically significant. The results show that temperature has little impact on Gmm. Gmm was not affected by curing times of 1 and 2 h, but the longer curing time of 4 h resulted in a statistically significant increase in Gmm. Further analysis revealed that the mix sensitivity to curing time depends on the amount of RAP in the mix. For the mix designs studied, the Advera Gmm values were similar to the HMA values, but the Sasobit Gmm values were statistically lower than the Advera values.
| Author | : Zhanping Yuo |
| Publisher | : |
| Total Pages | : 108 |
| Release | : 2011 |
| Genre | : Asphalt emulsion mixtures |
| ISBN | : |
Download Laboratory Evaluation of Warm Mix Asphalt Book in PDF, ePub and Kindle
Hot Mix Asphalt (HMA) has been traditionally produced at a discharge temperature of between 280° F (138° C) and 320° F (160° C), resulting in high energy (fuel) costs and generation of greenhouse gases. The goal for Warm Mix Asphalt (WMA) is to use existing HMA plants and specifications to produce quality dense graded mixtures at significantly lower temperatures. Europeans are using WMA technologies that allow the mixture to be placed at temperatures as low as 250° F (121° C). It is reported that energy savings on the order of 30%, with a corresponding reduction in CO2 emissions of 30%, are realized when WMA is used compared to conventional HMA. Although numerous studies have been conducted on WMA, only limited laboratory experiments are available and most of the current WMA laboratory test results are inconsistent and not compatible with field performance The main objectives of this study are: The main objectives of this study are: 1) review and synthesize information on the available WMA technologies; 2) measure the complex/dynamic modulus of WMA and the control mixtures (HMA) for comparison purpose and for use in mechanistic-empirical (ME) design comparison; 3) assess the rutting and fatigue potential of WMA mixtures; and 4) provide recommendation for the proper WMA for use in Michigan considering the aggregate, binder, and climatic factors. The testing results indicated that most of the WMA has higher fatigue life and TSR which indicated WMA has better fatigue cracking and moisture damage resistant; however, the rutting potential of most of the WMA tested were higher than the control HMA. In addition, the WMA design framework was developed based on the testing results, and presented in this study to allow contractors and state agencies to successfully design WMA around the state of Michigan.
| Author | : Alexander Jordan Austerman |
| Publisher | : |
| Total Pages | : 190 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download Laboratory and Field Evaluation of Warm Mix Asphalt Book in PDF, ePub and Kindle
| Author | : Haritha Malladi |
| Publisher | : |
| Total Pages | : 100 |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
Download Laboratory Evaluation of Warm Mix Asphalt Technologies for Moisture and Rutting Susceptibility Book in PDF, ePub and Kindle
| Author | : Asphalt Institute |
| Publisher | : |
| Total Pages | : 102 |
| Release | : 2001-01-01 |
| Genre | : Asphalt |
| ISBN | : 9781934154175 |
Download Superpave Mix Design Book in PDF, ePub and Kindle
| Author | : Yiqiu Tan |
| Publisher | : |
| Total Pages | : 9 |
| Release | : 2012 |
| Genre | : Additive |
| ISBN | : |
Download Comparative Study on Laboratory Performance of Hot- and Warm-mix Asphalt Mixtures Book in PDF, ePub and Kindle
In an effort to study sustainable environmentally friendly pavement, the physical mechanics and road performance of warm-mix asphalt mixtures based on an emulsifying platform were studied via the Marshall design method. The results show that the optimum asphalt content of warm-mix asphalt mixtures is generally higher than that of hot-mix asphalt mixtures by 0.1 % to 0.2 %; the values of the stability, bulk specific gravity, air voids, and voids in mineral aggregate do not change significantly; and the number of voids filled with asphalt and the flow value increase a little. The residual stability value of warm-mix asphalt mixtures increases, whereas the freeze-thaw splitting strength decreases. The high-temperature performance and seepage performance of warm-mix asphalt mixtures are similar to those of hot-mix asphalt mixtures.
| Author | : Fan Yin |
| Publisher | : |
| Total Pages | : 74 |
| Release | : 2013 |
| Genre | : |
| ISBN | : |
Download Evaluation of Laboratory Conditioning Protocols for Warm-Mix Asphalt Book in PDF, ePub and Kindle
Warm-Mix Asphalt (WMA) refers to the asphalt concrete paving material produced and placed at temperatures approximately 50°F lower than those used for Hot-Mix Asphalt (HMA). Economic, environmental and engineering benefits have boosted the use of WMA technology across the world during the past decade. While WMA technology has been successfully utilized as a paving material, several specifications and mix design protocols remain under development. For example, currently, there is no consistent laboratory conditioning procedure for preparing WMA specimens for performance tests, despite being essential for mix performance. Based on previous studies, several candidate conditioning protocols for WMA Laboratory Mixed Laboratory Compacted (LMLC) and off-site Plant Mixed Laboratory Compacted (PMLC) specimens were selected, and their effects on mixture properties were evaluated. Mixture stiffness evaluated in a dry condition using the Resilient Modulus (MR) test (ASTM D-7369) was the main parameter used to select a conditioning protocol to simulate pavement stiffness in its early life. The number of Superpave Gyratory Compactor (SGC) gyrations to get 7±0.5% air voids (AV) was the alternative parameter. Extracted binder stiffness and aggregate orientation of field cores and on-site PMLC specimens were evaluated using the Dynamic Shear Rheometer (DSR) (AASHTO T315) and image analysis techniques, respectively. In addition, mixture stiffness in a wet condition was evaluated using the Hamburg Wheel-Track Test (HWTT) (AASHTO T324) stripping inflection point (SIP) and rutting depth at a certain number of passes. Several conclusions are made based on test results. LMLC specimens conditioned for 2 hours at 240°F (116°C) for WMA and 275°F (135°C) for HMA had similar stiffnesses as cores collected during the early life of field pavements. For off-site PMLC specimens, different conditioning protocols are recommended to simulate stiffnesses of on-site PMLC specimens: reheat to 240°F (116°C) for WMA with additives and reheat to 275°F (135°C) for HMA and foamed WMA. Additionally, binder stiffness, aggregate orientation, and overall AV had significant effects on mixture stiffness. Mixture stiffness results for PMFC cores and on-site PMLC specimens in a wet condition as indicated by HWTT agree with those in a dry condition in MR testing. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148143
| Author | : David Newcomb |
| Publisher | : |
| Total Pages | : 196 |
| Release | : 2015 |
| Genre | : Asphalt |
| ISBN | : |
Download Short-term Laboratory Conditioning of Asphalt Mixtures Book in PDF, ePub and Kindle
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
| Author | : Zhaoxing Xie |
| Publisher | : |
| Total Pages | : 9 |
| Release | : 2014 |
| Genre | : Comparative investigation |
| ISBN | : |
Download Laboratory Investigation of the Effect of Warm Mix Asphalt (WMA) Additives on the Properties of WMA Used in China Book in PDF, ePub and Kindle
To investigate and compare the influence of various commonly used warm mix asphalt (WMA) additives on the physical, mechanical, and performance properties of WMA, a series of laboratory testing programs such as air void, voids in mineral aggregate, freeze-thaw splitting, wheel tracking test, and bending beam tests were performed. The experimental design of WMA mixtures included the use of three WMA additives of Sasobit, Evotherm and Rediset, two asphalt binders of SK-70 base asphalt, and a styrene-butadiene-styrene (SBS)-modified one. The testing results of WMA were also compared to that hot mix asphalt (HMA) as controls. Results from this study showed that: (1) volumetric properties (air voids and VMA) of WMAs did not have significant difference from the controls; (2) WMA with Sasobit had the greatest Marshall stability, followed by the WMA with Rediset, whereas all WMAs with Evotherm had the least, regardless of the types of asphalt; and (3) for WMA with modified asphalt, the dynamic stability of WMA with Rediset was a slightly greater than other two WMAs. For WMAs with base asphalt, the dynamic stability with Evotherm and Sasobit was similar to the control and greater than that with Rediset: (4) The WMAs with Sasobit have slightly greater indirect tensile strength (ITS) and tensile strength ratio (TSR) than the other two, regardless of the types of asphalt. (5) WMAs with Rediset had the greatest bending failure strain, regardless of the types of asphalt. Among all asphalt mixtures, most of WMAs had lower bending failure strain than the controls.
| Author | : Chandra K. Akisetty |
| Publisher | : |
| Total Pages | : 8 |
| Release | : 2010 |
| Genre | : Crumb rubber |
| ISBN | : |
Download Evaluation of Engineering Properties of Rubberized Laboratory Mixes Containing Warm Mix Additives Book in PDF, ePub and Kindle
Warm mix asphalt (WMA) refers to technologies which allow a significant reduction of mixing and compaction temperatures of asphalt mixes. From previous studies, it is observed that warm mix additives work in different ways, either in reducing the viscosity of the asphalt binder or allowing better workability of the asphalt mix at lower temperatures through volume expansion in the binder. If the technologies of WMA are incorporated into rubberized asphalt mixes, which are generally produced and compacted at higher temperature than conventional mixes, it is possible to reduce the mixing and compaction temperatures of rubberized mixes to those of conventional mixes. This paper presents a limited study that characterizes the engineering properties of crumb rubber modifier (CRM) mixtures containing warm mix additives. Six CRM mixtures (two of control mixtures and four of warm mixtures) were prepared using two aggregate sources and two additives: Aspha-min® and Sasobit®. Evaluation of all mixtures included the following testing procedures: tensile strength ratio, asphalt pavement analyzer, resilient modulus, and resilient modulus after long-term oven aging. The results from this study showed that in general, there was no significant difference between the control and warm CRM mixtures for the properties evaluated in this study, indicating that the use of WMA technologies into CRM mixes is expected to have no negative effect on the mixture's engineering properties.
