Implementation of Cold In-Place Recycling with Expanded Asphalt Technology in Canada

2005 ◽  
Vol 1905 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Becca Lane ◽  
Tom Kazmierowski
Keyword(s):  
Resilient Modulus ◽  
Efficient Manner ◽  
Pavement Rehabilitation ◽  
Asphalt Cement ◽  
Foamed Asphalt ◽  
Pavement Roughness ◽  
Asphalt Mix ◽  
Indirect Tensile ◽  
Emulsified Asphalt ◽  
Falling Weight

Cold in-place recycling (CIR) is a pavement rehabilitation method that processes an existing hot-mix pavement, sizes it, mixes in additional asphalt cement, and lays it back down without off-site hauling and processing. The added asphalt cement is typically emulsified asphalt. A recent development in CIR technology is the use of expanded (foamed) asphalt rather than emulsified asphalt to bind the mix. This combination of CIR and expanded asphalt technologies is termed cold in-place recycled expanded asphalt mix (CIREAM). The Ministry of Transportation Ontario (MTO) constructed a CIREAM trial section on Highway 7 in July 2003. The 5-km CIREAM trial section was constructed adjacent to an 8-km section on which conventional CIR was performed. CIREAM placement resulted in a smooth, hard, uniform surface that provided an excellent platform for paving operations. The CIREAM placement progressed in a continuous and efficient manner, with 5 km placed over a 3-day period. Indirect tensile strength testing was carried out on both materials during construction. Falling weight deflectometer (FWD) testing and evaluation of pavement roughness and rutting by the use of MTO's automatic road analyzer (ARAN) were carried out. Resilient modulus testing of core samples of the CIR material and CIREAM was also carried out. The results of the FWD, ARAN, and resilient modulus tests indicated that the CIR and CIREAM pavements were performing similarly. A field review 1 year after construction showed no discernible distortion, rutting, or cracking. On the basis of short-term results, CIREAM appears to be an acceptable in-place recycling and rehabilitation strategy that provides an economical alternative to conventional CIR, reduces curing time, and extends the construction season.

scholarly journals Effect of aging on the physical-mechanical characteristics of an asphalt mixture with rubber

2021 ◽  
Vol 2102 (1) ◽  
pp. 012020
Author(s):  
J G Bastidas-Martínez ◽  
J C Ruge ◽  
R A G Zuluaga ◽  
L Medina
Keyword(s):  
Mechanical Characteristics ◽  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Asphalt Mix ◽  
Aging Conditions ◽  
Short And Long Term ◽  
Indirect Tensile ◽  
Recycled Rubber ◽  
Monotonic Loads

Abstract This paper evaluated the physical-mechanical characteristics of two asphalt mixtures. One mix with conventional asphalt and the other with asphalt modified with recycled rubber grain. For this purpose, the asphalt mix designs were made by means of the Marshall methodology. Subsequently, asphalt mixtures were manufactured to analyze the action of monotonic loads (indirect tensile strength) and dynamic loads (resilient modulus). Previously, each type of asphalt mix was subjected to short- and long-term aging conditions, following Aastho guidelines. It is concluded that the incorporation of recycled rubber grain makes the changes in mechanical properties with aging not very noticeable in relation to mixtures without this material.

Investigation of Stone Matrix Asphalt Mortars

1996 ◽  
Vol 1530 (1) ◽  
pp. 95-102 ◽  
Author(s):  
E. Ray Brown ◽  
John E. Haddock ◽  
Campbell Crawford
Keyword(s):  
Resilient Modulus ◽  
Heavy Traffic ◽  
The United States ◽  
Asphalt Pavements ◽  
Fine Aggregate ◽  
Asphalt Cement ◽  
Stone Matrix Asphalt ◽  
Initial Application ◽  
Indirect Tensile ◽  
Stone Matrix

The use of stone matrix asphalt (SMA) has continued to increase in the United States since its initial application in 1991. This preference for SMA has been linked to its ability to withstand heavy traffic without rutting. The antirutting capability of SMA is normally accredited to the presence of a stone-on-stone aggregate skeleton in the mixture. However, the mortar in an SMA mixture is also important. The mortar is composed of fine aggregate, filler, asphalt cement, and a stabilizing additive. Work to characterize SMA mortars is detailed. For testing purposes, the mortar was broken into separate phases, total mortar and fine mortar. The fine mortar was tested using the Superior Performing Asphalt Pavements system (Superpave) binder tests. The total mortar was tested using the bending beam rheometer, resilient modulus, indirect tensile test, and Brookfield vis-cometer. The results indicate that the fine and total mortars are closely related. In addition, it was determined that at least some of the Superpave tests can be used to characterize SMA mortars. It is recommended that further testing be completed and specification criteria be established for the mortar.

scholarly journals Laboratory and Field Investigation of the Feasibility of Crumb Rubber Waste Application to Improve the Flexibility of Anti-Rutting Performance of Asphalt Pavement

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1738 ◽  
Author(s):  
Hongyin Li ◽  
Hailong Jiang ◽  
Wenwu Zhang ◽  
Peng Liu ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Field Investigation ◽  
Compression Tests ◽  
Modified Asphalt ◽  
Asphalt Mix ◽  
Low Temperature Cracking ◽  
Indirect Tensile

Resistance of asphalt mix to low-temperature cracking and rutting at high temperature is very important to ensure the service performance of asphalt pavement under seasonal changes in temperature and loading. However, it is challenging to balance the improvement of such resistance by using additives, e.g., anti-rutting agent (ARA). This study focuses on improving the flexibility of anti-rutting asphalt mix by incorporating crumb rubber (CR) and ARA. The properties of the prepared modified asphalt mix were evaluated in the laboratory by performing wheel tracking, three-point bending, indirect tensile, and uniaxial compression tests. The experimental results showed that the dynamic stability of modified asphalt mix was significantly increased due to the addition of ARA and further improved by incorporating CR. The maximum bending strain at −10 °C was increased due to the contribution of CR. The results of indirect tensile strength and resilient modulus further indicated that the CR-modified anti-rutting mixture was more flexible. Moreover, the field observation and evaluation indicated that the CR-modified anti-rutting asphalt pavement met the standard requirements, better than normal asphalt mixture in many parameters. A conclusion can be made that incorporating CR in asphalt mixture prepared with ARA can improve pavement performance at both high and low in-service temperatures.

Laboratory Test Methods for Foamed Asphalt Mix Resilient Modulus

2009 ◽  
Vol 10 (1) ◽  
pp. 187-212 ◽  
Author(s):  
Pengcheng Fu ◽  
David Jones ◽  
John T Harvey ◽  
Syed A Bukhari
Keyword(s):  
Laboratory Test ◽  
Resilient Modulus ◽  
Test Methods ◽  
Foamed Asphalt ◽  
Asphalt Mix

Laboratory Test Methods for Foamed Asphalt Mix Resilient Modulus

2009 ◽  
Vol 10 (1) ◽  
pp. 188-212 ◽  
Author(s):  
Pengcheng Fu ◽  
David Jones ◽  
John T. Harvey ◽  
Syed A. Bukhari
Keyword(s):  
Laboratory Test ◽  
Resilient Modulus ◽  
Test Methods ◽  
Foamed Asphalt ◽  
Asphalt Mix

A Balanced Mix Design Method for Selecting the Optimum Binder Content of Cold In-Place Recycling Asphalt Mixtures

2019 ◽  
Vol 2673 (3) ◽  
pp. 526-539 ◽  
Author(s):  
Ahmed Saidi ◽  
Ayman Ali ◽  
Wade Lein ◽  
Yusuf Mehta
Keyword(s):  
Complex Modulus ◽  
Cement Content ◽  
Design Method ◽  
Binder Content ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Air Voids ◽  
Foamed Asphalt ◽  
Indirect Tensile ◽  
Emulsified Asphalt

The objective of this paper is to present a procedure for designing cold in-place recycling (CIR) mixtures through balancing rutting and cracking for these mixtures. Four CIR mixtures were prepared using two recycling agents (foamed and emulsified asphalts), and compacted at two gyration levels (30 and 70 gyrations). The CIR mixtures were prepared at a constant water content of 3% and a constant cement content of 1% while curing of the compacted samples was conducted by placing them in an oven for three days at 140°F (dry curing). The CoreLok device was used for measuring air voids in compacted samples. The rutting susceptibility of these mixtures was then evaluated using the asphalt pavement analyzer (APA) and dynamic complex modulus (|E*|) while resistance to cracking was assessed using the indirect tensile strength (ITS) test and fracture energy as determined using the semi-circular bend (SCB-FE) test. A demonstration of how these tests were utilized to select a performance balanced optimum binder content for each of the four CIR mixes was also presented. The developed balanced mix design approach was used successfully for designing four CIR mixtures and selecting the optimum binder content for each mix. The results also showed that using a higher compaction level leads to increasing both foamed and emulsified asphalt CIR mixtures’ ability to resist rutting. In terms of cracking, SCB-FE results showed that foamed asphalt mixtures were better at resisting cracking than emulsified asphalt CIR mixtures.

Comparing back-calculated and laboratory resilient moduli of bituminous paving mixtures

2004 ◽  
Vol 31 (6) ◽  
pp. 988-996 ◽  
Author(s):  
Ahmed Shalaby ◽  
Tara Liske ◽  
Amir Kavussi
Keyword(s):  
Laboratory Testing ◽  
Resilient Modulus ◽  
Field Tests ◽  
Falling Weight Deflectometer ◽  
Important Indicator ◽  
Indirect Tensile Test ◽  
Test Parameters ◽  
Back Calculation ◽  
Indirect Tensile ◽  
Falling Weight

The stiffness of bituminous mixes is an important indicator of mix performance and a required input for mechanistic pavement design. Resilient modulus is one of many stiffness indicators of mixes which can be determined using laboratory testing methods or non-destructive field tests such as falling weight deflectometer (FWD) tests through back calculation. In this paper, two Manitoba mixes known as Bituminous B (Bit B) and Bituminous C (Bit C) are analysed using laboratory testing and FWD back calculation. The experiment involved samples from eight paving sites. Each site included two side-by-side sections having a common Bit B surface course over either a Bit B or a Bit C binder course. Cored samples were tested following the guidelines of the long term pavement performance protocol P07 at 5, 25, and 40 °C. The modulus of each layer was also estimated from FWD deflection measurements. Findings include correlations between the various material and test parameters and a comparison between back calculated and laboratory stiffnesses.Key words: falling weight deflectometer, indirect tensile test, resilient modulus, asphalt concrete.

Relating Laboratory Foamed Asphalt Mix Resilient Modulus Tests to Field Measurements

2009 ◽  
Vol 10 (1) ◽  
pp. 155-185 ◽  
Author(s):  
Pengcheng Fu ◽  
Bruce D. Steven ◽  
David Jones ◽  
John T. Harvey
Keyword(s):  
Resilient Modulus ◽  
Field Measurements ◽  
Foamed Asphalt ◽  
Asphalt Mix
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