Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture
In recent years, there has been an increasing interest in steel slag asphalt mixtures. Steel slag has good mechanical properties, but there is a risk of leaching of heavy metal elements during the steel slag stockpiling process and after paving asphalt pavement. Therefore, this work firstly investig...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-06-01
|
| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522001991 |
| _version_ | 1811337707316576256 |
|---|---|
| author | Youwei Gan Chuangmin Li Junfang Zou Wei Wang Ting Yu |
| author_facet | Youwei Gan Chuangmin Li Junfang Zou Wei Wang Ting Yu |
| author_sort | Youwei Gan |
| collection | DOAJ |
| description | In recent years, there has been an increasing interest in steel slag asphalt mixtures. Steel slag has good mechanical properties, but there is a risk of leaching of heavy metal elements during the steel slag stockpiling process and after paving asphalt pavement. Therefore, this work firstly investigated the effect of different influencing factors on the leaching concentration of heavy metal elements during the steel slag stockpiling process and analyzed the leaching mechanism by microstructure. Then, the gray relational analysis method was adopted to compare the magnitude of the effects of asphalt type, grade type, binder content and temperature on the leaching concentration of heavy metal elements in steel slag asphalt mixes. The results showed that the leaching concentration of heavy metal elements from steel slag increased rapidly due to the acid rain effect. With the formation of CaSO4 crystals to fill the micro-pores on the steel slag surface, the leaching concentration of heavy metals slowed down. Cu is the element with the largest leaching risk coefficient. The increase of specific surface area and the decrease of pH value will increase the leaching risk of heavy metals in steel slag. The leaching risk of steel slag was significantly reduced after it was prepared into asphalt mixes. The main influencing factor for the leaching risk of heavy metal elements from steel slag asphalt mixes is the type of grading, the secondary factors are temperature and asphalt content. Considering the high temperature environment common in asphalt pavements during use, it is recommended to use dense-graded asphalt mixtures in areas of high temperatures. |
| first_indexed | 2024-04-13T17:58:52Z |
| format | Article |
| id | doaj.art-7b5a1dec8b7345a1b2e58f6145a28fde |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-13T17:58:52Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-7b5a1dec8b7345a1b2e58f6145a28fde2022-12-22T02:36:20ZengElsevierCase Studies in Construction Materials2214-50952022-06-0116e01067Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixtureYouwei Gan0Chuangmin Li1Junfang Zou2Wei Wang3Ting Yu4School of Traffic & Transportation Engineering, Changsha University of Science &Technology, Changsha 410004, China; Corresponding author.School of Traffic & Transportation Engineering, Changsha University of Science &Technology, Changsha 410004, ChinaHanjiang Chengjian Group Co., Ltd, Xiangyang 441002, ChinaHunan Communication Engineering Polytechnic, Changsha 410132, ChinaZhejiang Academy of Special Equipment Science, Hangzhou 310000, China; Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province, Hangzhou 310000, ChinaIn recent years, there has been an increasing interest in steel slag asphalt mixtures. Steel slag has good mechanical properties, but there is a risk of leaching of heavy metal elements during the steel slag stockpiling process and after paving asphalt pavement. Therefore, this work firstly investigated the effect of different influencing factors on the leaching concentration of heavy metal elements during the steel slag stockpiling process and analyzed the leaching mechanism by microstructure. Then, the gray relational analysis method was adopted to compare the magnitude of the effects of asphalt type, grade type, binder content and temperature on the leaching concentration of heavy metal elements in steel slag asphalt mixes. The results showed that the leaching concentration of heavy metal elements from steel slag increased rapidly due to the acid rain effect. With the formation of CaSO4 crystals to fill the micro-pores on the steel slag surface, the leaching concentration of heavy metals slowed down. Cu is the element with the largest leaching risk coefficient. The increase of specific surface area and the decrease of pH value will increase the leaching risk of heavy metals in steel slag. The leaching risk of steel slag was significantly reduced after it was prepared into asphalt mixes. The main influencing factor for the leaching risk of heavy metal elements from steel slag asphalt mixes is the type of grading, the secondary factors are temperature and asphalt content. Considering the high temperature environment common in asphalt pavements during use, it is recommended to use dense-graded asphalt mixtures in areas of high temperatures.http://www.sciencedirect.com/science/article/pii/S2214509522001991Steel slagAsphalt mixtureLeaching risksToxic leachingGray relational analysis |
| spellingShingle | Youwei Gan Chuangmin Li Junfang Zou Wei Wang Ting Yu Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture Case Studies in Construction Materials Steel slag Asphalt mixture Leaching risks Toxic leaching Gray relational analysis |
| title | Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| title_full | Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| title_fullStr | Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| title_full_unstemmed | Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| title_short | Evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| title_sort | evaluation of the impact factors on the leaching risk of steel slag and its asphalt mixture |
| topic | Steel slag Asphalt mixture Leaching risks Toxic leaching Gray relational analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522001991 |
| work_keys_str_mv | AT youweigan evaluationoftheimpactfactorsontheleachingriskofsteelslaganditsasphaltmixture AT chuangminli evaluationoftheimpactfactorsontheleachingriskofsteelslaganditsasphaltmixture AT junfangzou evaluationoftheimpactfactorsontheleachingriskofsteelslaganditsasphaltmixture AT weiwang evaluationoftheimpactfactorsontheleachingriskofsteelslaganditsasphaltmixture AT tingyu evaluationoftheimpactfactorsontheleachingriskofsteelslaganditsasphaltmixture |