An investigation on modification mechanism of CH2O-modified low temperature coal tar pitches
Qiang XIN1,2(), Shanghong HUANG3
1. College of Civil Engineering, Tongji University, Shanghai 200092, China 2. Inner Mongolia Communications Design and Research Institute Co. LTD, Huhhot 010010, China 3. National Center for Material Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Rising oil price has brought huge cost pressure for low grade highway construction, and it is urgent to find alternative resources. At the same time, there are nearly 50000–60000 tons of low temperature coal output in inner Mongolia region, China, which has high toxicity and high polluting. To make the low temperature coal be applicable for road constructions, the formaldehyde is used as cross linking agent, the concentrated sulfuric acid is used as catalyst, and the chemical modification of low temperature coal tar pitch in Inner Mongolia region is investigated. The road performance (softening point, penetration and ductility) of modified low temperature coal are tested. Results shown that the road performance of modified low temperature coal is increased significantly. Modification mechanism of low temperature coal is studied by Scanning Electron Microscopy and other analytical tools. Results show that, in the modified low temperature coal, resin content increases and the resin fiber diameter becomes larger with the increasing of formaldehyde content.
. [J]. Frontiers of Structural and Civil Engineering, 2017, 11(3): 293-300.
Qiang XIN, Shanghong HUANG. An investigation on modification mechanism of CH2O-modified low temperature coal tar pitches. Front. Struct. Civ. Eng., 2017, 11(3): 293-300.
ChangH, WeiW, WangZ, YangH, YaoR. Properties and application of coal pitch. Shanxi Coking Coal Science & Technology, 2007, (2): 39–46
2
Deng H. Development and application of epoxy coal pitch coating. Corrosion & Protectin, 1999, 20(3): 130–131
3
WuJ. Application of coal pitch in highway engineering. Transpoworld, 2010, (5): 295–296.
4
Zielinski J, Gorecki G. Utilization of Coal-Tar Pitch in Insulating-Seal Materials. ACS Division of Fuel Chemistry, Chicago, 1993
5
Collin G. Production and Application of Coal-Tar Pitch. In: Conference on Structure and Properties of Coals, 1991: 154.
6
Jing Z, Lin O Y, Liu Z. Modification on coal- tar-pitch by additives. J. of Anhui Poly Technology University, 2001, 31(7): 38–40
7
Hany M.Sciences of carbon materials. Secretariado de publicaciones, Alicante, Spain, 2000
8
Zubkova V V. Influence of polyethylene terephthalate on the carbonisation of bituminous coals and on the modification of their electric and dielectric properties. Fuel, 2006, 85(12-13): 1652–1665 https://doi.org/10.1016/j.fuel.2006.03.006
9
Bhatia G, Aggarwal R K, Chari S S, Jain G C. Rheological characteristics of coal tar and petroleum pitches with and without additives. Carbon, 1977, 15(4): 219–223 https://doi.org/10.1016/0008-6223(77)90003-3
10
Aksoy A. Investigation of rutting performance of asphalt mixtures containing polymer modiers. Construction & Building Materials, 2007, 12: 328–337
11
Riggs D M. Polymer for fibers and elastomers. ACS Symposium Series, 1984, 260
13
Hou Y, Wang L, Yue P, Pauli T, Sun W. Modeling Mode I Cracking Failure in Asphalt Binder by Using Nonconserved Phase-Field Model. Journal of Materials in Civil Engineering, 2014, 26(4): 684–691 https://doi.org/10.1061/(ASCE)MT.1943-5533.0000874
14
Hou Y, Wang L, Yue P, Sun W. Fracture Failure in Crack interaction of Asphalt Binder by Using a Phase Field Approach. Materials and Structures, 2015a, 48(9): 2997–3008 https://doi.org/10.1617/s11527-014-0372-x
15
Hou Y, Wang L, Pauli T, Sun W. Investigation of the Asphalt Self-healing Mechanism Using a Phase-Field Model. Journal of Materials in Civil Engineering, 2015b, 27(3): 1–13 https://doi.org/10.1061/(ASCE)MT.1943-5533.0001047
16
Hou Y, Sun F, Sun W, Guo M, Xing C, Wu J. Quasi-brittle Fracture Modeling of Pre-Flawed Bitumen Using a Diffuse Interface Model. Advances in Materials Science and Engineering, 2016, (6): 1–7
17
HouY, SunW, DasP, SongX, WangL, GeZ, and HuangY. Coupled Navier-Stokes Phase-Field Model to Evaluate the Microscopic Phase Separation in Asphalt Binder under Thermal Loading. Journal of Materials in Civil Engineering, 2016, 28(10): 04016100
18
HouY, HuangY, SunF, GuoM. Fractal Analysis on Asphalt Mixture Using a Two-Dimensional Imaging Technique. Advances in Materials Science and Engineering, 2016, (2): 1–7
19
XuH N, GuoW, TanY Q. Permeability of asphalt mixtures exposed to freeze-thaw cycles. Cold Regions Science and Technology, 2016, 123(3): 99–106
20
XuH N, GuoW, TanYQ. Internal structure evolution of asphalt mixtures during freeze-thaw cycles. Materials and Design, 2015, 86(12): 436–446
21
XuH N, TanY Q, YaoX A. X-ray Computed Tomography in hydraulics of asphalt mixtures: Procedure, accuracy, and application. Construction and Building Materials, 2016, 108(4): 10–21
