| 矿渣?粉煤灰地聚合物固化砂土力学特性研究 |
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| 引用本文： | 张津津,李博,余闯,张茂雨.矿渣?粉煤灰地聚合物固化砂土力学特性研究[J].岩土力学,2022,43(9):2421-2430. |
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| 作者姓名： | 张津津 李博 余闯 张茂雨 |
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| 作者单位： | 1. 温州大学 建筑工程学院，浙江 温州 325035；2. 温州理工学院 温州市韧性城市生命线工程智慧防护应急技术重点实验室，浙江 温州 325035；3. 台州学院 建筑工程学院，浙江 台州 318000 |
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| 基金项目： | 国家自然科学基金项目（No.51978531）；浙江省公益项目（No.LGG22E080006）。 |
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| 摘 要： | 硅酸盐水泥作为常规的土壤固化剂存在高能耗、高排放等问题，研究人员一直在寻求一种更加经济环保的水泥代替品。使用基于高炉矿渣（ground granulated
blast-furnace slag，简称 GGBS）、粉煤灰（ fly ash，简称 FA）的地聚合物对砂土进行加固，通过调整激发剂的种类和配比、矿渣与粉煤灰比例、水灰比和养护条件等，研究不同因素对地聚合物固化砂土力学性能的影响。通过无侧限抗压强度（unconfined compressive
strength，简称 UCS）测试、电子计算机断层扫描（ computed tomography，简称 CT ）分析、扫描电子显微镜（scanning electron
microscope，简称 SEM）对试样进行了深入研究。结果表明：基于 GGBS-FA 的地聚合物可有效地提高砂土的力学性能；复合激发剂的加固效果优于单组分激发剂；低温不会明显降低地聚合物固化砂土的最终力学性能，仅延缓了地质聚合反应和结构的形成；碱性环境对地聚合物固化砂土的强度有促进作用；酸性环境及长时间暴露在空气中，会降低地聚合物固化砂土的强度。
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| 关 键 词： | 地聚合物 砂土固化 无侧限抗压强度（UCS） 微观结构 |
| 收稿时间： | 2021-11-13 |
| 修稿时间： | 2022-04-28 |
Mechanical properties of slag-fly ash based geopolymer stabilized sandy soil |
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| ZHANG Jin-jin,LI Bo,YU Chuang,ZHANG Mao-yu.Mechanical properties of slag-fly ash based geopolymer stabilized sandy soil[J].Rock and Soil Mechanics,2022,43(9):2421-2430. |
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| Authors: | ZHANG Jin-jin LI Bo YU Chuang ZHANG Mao-yu |
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| Institution: | 1. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China; 2. Wenzhou Key Laboratory of Intelligent Lifeline Protection and Emergency Technology for Resilient City, Wenzhou Institute of Technology, Wenzhou, Zhejiang 325035, China;
3. School of Civil Engineering and Architecture, Taizhou University, Taizhou, Zhejiang 318000, China |
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| Abstract: | Silicate cement
as a conventional soil curing agent has problems of high energy consumption and
high emissions, and researchers have been seeking a more economical and
environmentally friendly alternative to cement. In this study, geopolymers
based on ground granulated blast-furnace slag (GGBS) and fly ash (FA) were used
to reinforce sandy soils, and the effects of different factors on the
mechanical properties of geopolymer stabilized sandy soils were investigated by
adjusting the type and ratio of exciter, slag-fly ash ratio, water-cement ratio,
and curing conditions. The specimens were studied in depth by unconfined
compressive strength (UCS) test, electron computed tomography (CT) analysis,
and scanning electron microscopy (SEM). The results show that the GGBS-FA-based
geopolymer can effectively improve the mechanical properties of the sandy soil;
the reinforcement effect of the composite exciter is better than that of the
single-component exciter; the low temperature does not significantly reduce the
final mechanical properties of the geopolymer stabilized sandy soil, but only
delays the polymerization reaction and structure formation; the alkaline
environment promotes the strength of the geopolymer stabilized sandy soil; the
acidic environment and prolonged exposure to air reduce the strength of
geopolymer stabilized sandy soils. |
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| Keywords: | geopolymer stabilized sandy soil unconfined compressive strength (UCS) microstructure |
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