Bio-mediated calcium carbonate precipitation and its effect on the shear behaviour of calcareous sand
Bio-mediated calcium carbonate precipitation and its effect on the shear behaviour of calcareous sand
复制标题
生物介导碳酸钙沉淀及其对钙质砂剪切行为的影响
DOI：
10.1007/s11440-020-01099-0
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发表时间：
2020-11
期刊：
影响因子：
5.7
通讯作者：
Lai Hanjiang
中科院分区：
文献类型：
--
作者：
Cui Mingjuan;Zheng Junjie;Chu Jian;Wu Chaochuan;Lai Hanjiang
钙质砂粒内孔隙丰富，容易发生颗粒破碎。这往往会导致工程性能较差，给沿海基础设施建设带来挑战。本文介绍了一项利用生物胶结来改善钙质砂工程性能的研究。通过排水三轴试验和扫描电镜观察对生物胶结钙质砂的宏观和微观性质进行了表征。实验结果表明，沉淀碳酸钙能有效填充颗粒内和颗粒间孔隙，并粘结相邻颗粒，从而提高钙质砂的抗剪强度。钙质砂的特殊结构（如丰富的粒内孔隙和粗糙的表面）和矿物质成分（如碳酸钙）有利于改善土壤中细菌的滞留，导致砂粒表面碳酸钙分布相对均匀、致密，呈现逐层生长的模式。这种生长模式和丰富的颗粒间孔隙将导致碳酸钙的有效性降低。在碳酸钙含量相同的情况下，生物胶结钙质砂的强度增强明显低于生物胶结硅砂，这可能是由于以下方面的差异造成的：（a）土体骨架强度； (b)有效碳酸钙的量； (c)碳酸钙颗粒间孔隙填充。
Calcareous sands have abundant intraparticle pores and are prone to particle breakage. This often leads to poor engineering properties, which poses a challenge to coastal infrastructure construction. A study using bio-cementation to improve the engineering properties of calcareous sand is presented in this paper. The macro- and microscopic properties of bio-cemented calcareous sand were characterized by drained triaxial tests and scanning electron microscopy observations. Experimental results show that the precipitated calcium carbonate can effectively fill the intra- and interparticle pores and bond adjacent particles, thus enhancing the shear strength of calcareous sand. The special structures (e.g. abundant intraparticle pores and rough surface) and mineral components (i.e. calcium carbonate) of calcareous sand are beneficial for improving bacterial retention in soil, which leads to a relatively uniform and dense calcium carbonate distribution on the sand particle surface, exhibiting a layer-by-layer growth pattern. This growth pattern and the abundant interparticle pores would result in less effective calcium carbonate. The strength enhancement of bio-cemented calcareous sand is significantly lower than that of bio-cemented silica sand at the same calcium carbonate content, which may be caused by the differences in the following: (a) soil skeleton strength; (b) the amount of effective calcium carbonate; and (c) interparticle pore-filling of calcium carbonate.
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影响因子：
1.7
作者：
H. Brandes
通讯作者：
H. Brandes
影响因子：
--
作者：
Halpern GM
通讯作者：
Halpern GM
DOI：
10.1061/(asce)gt.1943-5606.0001302
发表时间：
2015-06-01
影响因子：
3.9
作者：
Montoya, B. M.;DeJong, J. T.
通讯作者：
DeJong, J. T.
影响因子：
5.2
作者：
S. Goodarzi;H. Shahnazari
通讯作者：
S. Goodarzi;H. Shahnazari
使用源自钙质砂的可溶性钙对钙质砂进行生物胶结
DOI：
10.1007/s10064-017-1106-4
发表时间：
2018-11-01
影响因子：
4.2
作者：
Liu, Lu;Liu, Hanlong;Wang, Yang
通讯作者：
Wang, Yang