碱类型对地聚合物混凝土应变率效应影响的对比研究

罗鑫; 许金余; 白二雷; 李为民

doi:10.11883/1001-1455(2014)03-0340-07

碱类型对地聚合物混凝土应变率效应影响的对比研究

doi: 10.11883/1001-1455(2014)03-0340-07

罗鑫^1, ,,
许金余^{1, 2},
白二雷¹,
李为民³

1.
空军工程大学工程学院机场建筑工程系，陕西西安 710038
2.
西北工业大学力学与土木建筑学院，陕西西安 710072
3.
广州军区空军后勤部机场处, 广东广州 510052

基金项目: 国家自然科学基金项目(51208507, 51378497);陕西省青年科技新星项目(2013KJXX-81)

详细信息

作者简介:
罗鑫(1986—), 男, 博士研究生

通讯作者:
Luo Xin, daisy817perwit@163.com

中图分类号: O347;TU528.572
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- 文章访问数: 2939
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- 被引次数: 0
出版历程
- 收稿日期: 2012-11-22
- 修回日期: 2013-03-07
- 刊出日期: 2014-05-25

Comparative study of the effect of the type of alkali on the strain rate effect of geopolymer concrete

Luo Xin^{1
, ,},
Xu Jin-yu^{1, 2},
Bai Er-lei¹,
Li Wei-min³

1.
Department of Airfield and Building Engineering, Air Force Engineering University Engineering College, Xi'an 710038, Shaanxi, China
2.
College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, Shaanxi, China
3.
Airport Office, Air Force Logistics Department in Guangzhou Military Region, Guangzhou 510052, Guangdong, China

Funds: Supported by the National Natural Science Foundation of China (51208507, 51078350)

摘要

摘要: 采用经波形整形技术改进后的∅100 mm SHPB实验装置开展了强度等级均为C30的NS激发矿渣粉煤灰基地聚合物混凝土(NaOH and sodium silicate-activated slag and fly ash based geopolymer concrete，NSSFGC)和NN激发矿渣粉煤灰基地聚合物混凝土(NaOH and Na₂CO₃-activated slag and fly ash based geopolymer concrete，NNSFGC)的动态压缩实验，并对比分析了在冲击荷载作用下的应变率效应。结果表明：NSSFGC和NNSFGC的峰值应力均随应变率的增加而越大。这表明，GC为应变率敏感材料；在动态压缩状态下，NSSFGC和NNSFGC的应变率敏感阈值分别为51.82、28.89 s^-1；GC的应变率敏感性强于普通混凝土；NN型激发剂更有利于发挥GC的整体强度特性。由此可知，NNSFGC的应变率敏感性明显强于NSSFGC。
- 固体力学 /
- 应变率效应 /
- 分离式霍普金森压杆 /
- 地聚合物混凝土 /
- 动态压缩实验 /
- 波形整形技术
Abstract: NaOH and sodium silicate-activated slag and fly ash based geopolymer concrete(NSSFGC) and NaOH and Na₂CO₃-activated slag and fly ash based geopolymer concrete(NNSFGC) with strength grades of C30 were prepared, the strain rate effects under impact loading were studied contrastly by using a 100-mm-diameter SHPB apparatus improved with the pulse shaper technique.The results indicate that, the peak stress of NSSFGC and NNSFGC increases with the increase of strain rate, which indicates that GC is a kind of strain rate sensitive material; strain rate sensitivity thresholds of NSSFGC and NNSFGC under dynamic compressive condition are 51.82 and 28.89 s^-1; the strain rate sensitivity is much stronger than ordinary concrete; the alkali-activator prepared with NaOH and Na₂CO₃ can be beneficial to give full play to overall strength property of GC.Thus it can be seen, that the strain rate sensitivity of NNSFGC is stronger than NSSFGC.
- solid mechanics /
- strain rate effect /
- split Hopkinson pressure bar(SHPB) /
- geopolymer concrete(GC) /
- dynamic compressive test /
- pulse shaping technique

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图 1 ∅100 mm SHPB实验装置

Figure 1. ∅100 mm SHPB experiment apparatus

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图 2 不同规格整形器下典型的入射波

Figure 2. Typical incident wave under different pulse shapers

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图 3 应变率时程曲线

Figure 3. The curves of strain rate vs time

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图 4 f_d和应变率的关系

Figure 4. The relationship between f_d and strain rates

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图 5 ξ随的变化规律

Figure 5. The law between ξ and

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图 6 GC破坏面

Figure 6. Facture section of GC

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