|Table of Contents|

Properties of semirigid base material with steel slag(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年4期
Page:
21-31
Research Field:
道路工程
Publishing date:

Info

Title:
Properties of semirigid base material with steel slag
Author(s):
JI Xin1; 2;  SHENG Yanping1; 2;  LU Zaihong3;  XIN Dejun4; LONG Yunfei5;  CHEN Huaxin1; 2
（1. School of Material Science and Engineering, Changan University, Xian 710061, Shaanxi, China； 2. Ministry ofEducation Engineering Center for Traffic Pavement Materials, Changan University, Xian 710064, Shaanxi, China；3. Inner Mongolia Transportation Design and Research Institute, Huhhot 010000, Inner Mongolia, China；4. Baotou Transportation Investment Group, Baotou 014030, Inner Mongolia, China）
Keywords:
road engineering;  steel slag;  semirigid base;  mechanical property;  shrinkage resistance;  antierosion performance
PACS:
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DOI:
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Abstract:
In order to realize the rational utilization of solid waste steel slag in semirigid base material, the CB3 type skeleton compaction gradation was selected, firstly, the compaction test was carried out, and the appropriate combination of cement and steel slag dosage was selected based on the results of the 7 d unconfined compressive strength test.Furthermore, following the unconfined compressive strength test, other parameters such as the indirect tensile strength, compressive resilience modulus, shrinkage and water erosion resistance of the chosen mixture were tested. Finally, the influence of cement dosage and steel slag content on the properties of base material at different curing ages were analyzed for revealing the strength formation mechanism, and influence that varying the proportions of cement and steel slag had on the base material.The results show that when cement dosage is kept constant, the unconfined compressive strength of steel slag base material increases at first, but then decreases with further increase steel slag content. Compared with the base material without steel slag, when the cement dosage and steel slag dosages (mass fraction, the same below) are 5% and 45% respectively, the compressive strength of the base material after 7,14 and 28 d curing increased by 6.8%, 9.6% and 6.0%respectively. Meanwhile, when steel slag content is increased to 65%, the compressive strength under the same conditions is increased by 11.3%, 15.4% and 12.1% respectively. In the water erosion resistance test,at 5% cement dosage,the post 28 d curing mass loss rate of the base material with 45% and 65% steel slag contents are 0.031% and 0.046% respectively, lower than that of the base mixture without steel slag content, and it is 0.034% and 0.041% respectively when cement dosage is increased to 6%. When compared with the mixture without steel slag, the dry shrinkage coefficient and temperature shrinkage coefficient of the mixture with 65% and 5%steel slag and cement contents decreased by 52.4% and 26.9% respectively, and when cement content is increased to 6%, it decreased by 49.4% and increased by 31.6% respectively.Therefore, it is obvious that at the appropriate dosage, the mechanical properties and antiscouring properties of steel slag base are better than those of ordinary cement stabilized macadam. In conclusion, steel slag can improve the antidrying shrinkage property of steel slag base material to some extent, even though it has no significant influence on the antitemperature shrinkage property. 9 tabs, 10 figs, 35 refs.

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Last Update: 2021-08-12