TY - JOUR
T1 - Performance of zeolite synthesized from sewage sludge ash as a warm mix asphalt additive
AU - Zou, Fuliao
AU - Leng, Zhen
AU - Cao, Ruijun
AU - Li, Gaoyang
AU - Zhang, Yuan
AU - Sreeram, Anand
N1 - Funding Information:
The authors would like to acknowledge the financial supports from the Hong Kong Environment and Conservation Fund under Grant number ECF 2015-61.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/6
Y1 - 2022/6
N2 - The disposal of sewage sludge ash (SSA) is a growing problem with both environmental and economic ramifications. This study aims to synthesize zeolite from SSA as a foaming-based warm mix asphalt (WMA) additive, and comprehensively characterize its performance. The SSA-derived zeolite was first characterized using X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), and Thermogravimetry-Differential Thermal Analyzer (TG-DTA) tests. Then, WMA mixtures with the SSA-derived zeolite and a commercial zeolite additive, and a conventional hot mix asphalt (HMA) mixture were produced in the laboratory for a wide range of engineering performance tests, including the indirect tensile stiffness modulus test, indirect tensile fatigue test, moisture susceptibility test, and Hamburg wheel-tracking test. The experimental results indicated that the SSA-derived zeolite was pure zeolite A which can release approximately 20% crystal water gradually from 70 oC to 200 oC. The overall performance of the WMA mixture with SSA-derived zeolite was better than that of the WMA mixture with commercial additive, and comparable to that of the HMA mixture except for rutting resistance, which is marginally lower but still satisfactory. Cost-benefit analysis was conducted in the end, which demonstrated that SSA-derived zeolite is eco-efficient. This study concluded that it is feasible to use the SSA-derived zeolite as an effective and sustainable WMA additive.
AB - The disposal of sewage sludge ash (SSA) is a growing problem with both environmental and economic ramifications. This study aims to synthesize zeolite from SSA as a foaming-based warm mix asphalt (WMA) additive, and comprehensively characterize its performance. The SSA-derived zeolite was first characterized using X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), and Thermogravimetry-Differential Thermal Analyzer (TG-DTA) tests. Then, WMA mixtures with the SSA-derived zeolite and a commercial zeolite additive, and a conventional hot mix asphalt (HMA) mixture were produced in the laboratory for a wide range of engineering performance tests, including the indirect tensile stiffness modulus test, indirect tensile fatigue test, moisture susceptibility test, and Hamburg wheel-tracking test. The experimental results indicated that the SSA-derived zeolite was pure zeolite A which can release approximately 20% crystal water gradually from 70 oC to 200 oC. The overall performance of the WMA mixture with SSA-derived zeolite was better than that of the WMA mixture with commercial additive, and comparable to that of the HMA mixture except for rutting resistance, which is marginally lower but still satisfactory. Cost-benefit analysis was conducted in the end, which demonstrated that SSA-derived zeolite is eco-efficient. This study concluded that it is feasible to use the SSA-derived zeolite as an effective and sustainable WMA additive.
KW - Asphalt mixture performance
KW - Chemical property
KW - Cost analysis
KW - Sewage sludge ash
KW - Warm mix additive
KW - Zeolite synthesis
UR - http://www.scopus.com/inward/record.url?scp=85125145817&partnerID=8YFLogxK
U2 - 10.1016/j.resconrec.2022.106254
DO - 10.1016/j.resconrec.2022.106254
M3 - Journal article
AN - SCOPUS:85125145817
SN - 0921-3449
VL - 181
JO - Resources, Conservation and Recycling
JF - Resources, Conservation and Recycling
M1 - 106254
ER -