[1]吴燕开,乔晓龙,李丹丹,等.干湿循环下钢渣粉水泥改良膨胀土室内试验研究[J].西安建筑科技大学学报(自然科学版),2021,53(03):319-329.[doi:10.15986/j.1006-7930.2021.03.002]
　WU Yankai,QIAO Xiaolong,LI Dandan,et al.Experimental study on expansive soil improved by steel slag powder-cement under dry-wet cycles[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2021,53(03):319-329.[doi:10.15986/j.1006-7930.2021.03.002]
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干湿循环下钢渣粉水泥改良膨胀土室内试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
53
期数:
2021年03期
页码:
319-329
栏目:
出版日期:
2021-06-28

文章信息/Info

Title:
Experimental study on expansive soil improved by steel slag powder-cement under dry-wet cycles
文章编号:
1006-7930(2021)03-0319-11
作者:
吴燕开1; 乔晓龙1; 李丹丹1; 韩 天2; 苗盛瑶1; 曹玉鹏3
(1.山东科技大学 土木工程与建筑学院,山东 青岛 266590; 2.中铁建工集团山东有限公司,山东 青岛 266061; 3.山东科技大学 交通学院,山东 青岛 266590)
Author(s):
WU Yankai1; QIAO Xiaolong1; LI Dandan1; HAN Tian2; MIAO Shengyao1; CAO Yupeng3
(1.School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,266590,China; 2.China Railway Construction Engineering Group Shandong Co.,Ltd.,Qingdao,266061,China; 3.School of Transportation,Shandong University of Science and Technology,Qingdao,266590,China)
关键词:
干湿循环;  改良膨胀土;  钢渣粉水泥;  无荷载膨胀率;  体积变化率;  无侧限抗压强度
Keywords:
dry-wet cycle;  improved expansive soil;  steel slag powder-cement;  no-load swelling rate;  volume change rate;  unconfined compressive strength
分类号:
TU443
DOI:
10.15986/j.1006-7930.2021.03.002
文献标志码:
A
摘要:
为有效控制干湿循环作用下膨胀土的膨胀性,利用水泥钢渣粉掺合料改良膨胀土.通过室内试验,研究了纯膨胀土(Es)、水泥改良膨胀土(Es-C)、钢渣粉-水泥改良膨胀土(Es-SSP-C)和钢渣粉-水泥-NaOH改良膨胀土(Es-SSP-C-N)在不同养护龄期以及不同干湿循环次数下的无荷载膨胀率、体积质量变化率、无侧限抗压强度(UCS)等物理力学性质的变化规律,并结合扫描电镜(SEM)和能谱(EDS)分析,对改良土内部的微观结构和物质进行探讨.结果表明:3种改良土的无荷载膨胀率均减少95%以上,膨胀达到稳定的时间缩短,其中:Es-SSP-C-N对膨胀土膨胀性的控制效果最佳; 经干湿循环作用后,改良土的体积变化率控制在1.6%以内,减小85%,质量变化率远低于未改良土,其中Es-SSP-C的体积、质量变化率最稳定; 3种改良土的无侧限抗压强度均有明显提高,其中Es-SSP-C-N的强度最高,Es-SSP-C对多次干湿循环作用下强度劣化的抵抗效果最优; 但钢渣粉自身水化周期较慢,约为60 d,掺加少量NaOH可以有效激发其水化活性.
Abstract:
In order to effectively control the swelling characteristics of expansive soil under dry-wet cycles,the cement-steel slag powder admixture was used to improve expansive soil. The samples of expansive soil(Es),cement improved expansive soil(Es-C),steel slag powder-cement improved expansive soil(Es-SSP-C)and steel slag powder-cement-NaOH improved expansive soil(Es-SSP-C-N)were prepared. The change rules of physical and mechanical properties such as no-load expansion rate,volume mass change rate and unconfined compressive strength(UCS)of the samples under different curing ages and different dry-wet cycles were tested. Combined with scanning electron microscope(SEM)and energy spectroscopy(EDS)analysis,the microstructure and material changes of the improved soil were discussed.The tests results showed that the no-load swelling rate of each improved soils were reduced by more than 95%,and the time for the swelling to reach stability was shortened,among which Es-SSP-C-N has the best control effect on the swelling of expansive soil. After dry-wet cycles,the volume change rate of each improved soils were controlled within 1.6%,which is reduced by 85%,and the mass change rate was much lower than that of the expansive soil,the volume and mass change rate of Es-SSP-C is the most stable. The unconfined compressive strength of each improved soils were significantly improved,among which Es-SSP-C-N had the highest strength,and Es-SSP-C had the best resistance to strength deterioration under repeated dry-wet cycles. The hydration cycle of steel slag powder itself was slow,about 60 days,and its hydration activity could be effectively stimulated by adding a small amount of NaOH.

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(编辑 吴海西 沈 波)

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备注/Memo

备注/Memo:
收稿日期:2020-10-07 修改稿日期:2021-03-25
基金项目:国家自然科学基金资助项目(51608312); 山东科技大学科研创新团队基金支持项目(2015KYDT104)
第一作者:吴燕开(1976-),男,博士,副教授.主要从事不良地基土改良等方面的教学科研工作.E-mail:wuyankai2000@163.com
通信作者:乔晓龙(1996-),男,硕士生,主要研究改良土方面的内容.E-mail:QXLnjxm795@163.com
更新日期/Last Update: 2021-06-28