Increasing wind erosion resistance of aeolian sandy soil by microbially induced calcium carbonate precipitation

2018 ◽  
Vol 29 (12) ◽  
pp. 4271-4281 ◽  
Author(s):  
Kanliang Tian ◽  
Yuyao Wu ◽  
Huili Zhang ◽  
Duo Li ◽  
Kangyi Nie ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Sandy Soil ◽  
Wind Erosion ◽  
Erosion Resistance ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation

scholarly journals Experimental Study on Wind Erosion Resistance and Strength of Sands Treated with Microbial-Induced Calcium Carbonate Precipitation

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Zhaoyu Wang ◽  
Nan Zhang ◽  
Jinhua Ding ◽  
Chen Lu ◽  
Yong Jin
Keyword(s):  
Calcium Carbonate ◽  
Wind Erosion ◽  
Erosion Resistance ◽  
Small Scale ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Bonding Effect ◽  
Strength Tests ◽  
Desert Areas ◽  
Number Of Treatment

Wind erosion phenomenon is commonly encountered in desert areas, which is harmful to engineering constructions and environment. This study proposed an innovative microbial-induced calcium carbonate precipitation (MICP) technique to reinforce sands for mitigating natural hazards caused by the wind erosion. A series of small-scale laboratory experiments were performed to evaluate wind erosion resistance of MICP-treated sands with different treatment cycles. The spraying method was used to treat sand specimens, and unconfined compression (UCC) strength tests were also conducted to assess the performance of the MICP technique. Experimental results revealed that the bulk density of treated sand was slightly increased with the number of MICP treatment cycles. Additionally, the wind erosion rate of treated sands was significantly decreased, and the UCC strength was increased (maximum to 4 MPa) with the number of treatment cycles, which was mainly attributed to the bonding effect from the microbial-induced CaCO3 crystals among sand particles based on the scanning electron microscopy (SEM) analyses. Such effect also facilitated to form a hard protection layer on top of the sand specimen in order to improve the wind erosion resistance of MICP-treated sands. This technique provides an alternative method to mitigate and prevent the aggravation of desertification.

scholarly journals Role of Na-Montmorillonite on Microbially Induced Calcium Carbonate Precipitation

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6211
Author(s):  
Guowang Tang ◽  
Cangqin Jia ◽  
Guihe Wang ◽  
Peizhi Yu ◽  
Haonan Zhang
Keyword(s):  
Calcium Carbonate ◽  
Sandy Soil ◽  
Carbonate Precipitation ◽  
Soil Consolidation ◽  
X Ray Diffraction ◽  
Calcium Carbonate Precipitation ◽  
X Ray ◽  
Significant Attention ◽  
Previous Reaction

The use of additives has generated significant attention due to their extensive application in the microbially induced calcium carbonate precipitation (MICP) process. This study aims to discuss the effects of Na-montmorillonite (Na-MMT) on CaCO3 crystallization and sandy soil consolidation through the MICP process. Compared with the traditional MICP method, a larger amount of CaCO3 precipitate was obtained. Moreover, the reaction of Ca2+ ions was accelerated, and bacteria were absorbed by a small amount of Na-MMT. Meanwhile, an increase in the total cementing solution (TCS) was not conducive to the previous reaction. This problem was solved by conducting the reaction with Na-MMT. The polymorphs and morphologies of the CaCO3 precipitates were tested by using X-ray diffraction and scanning electron microscopy. Further, when Na-MMT was used, the morphology of CaCO3 changed from an individual precipitate to agglomerations of the precipitate. Compared to the experiments without Na-MMT in the MICP process, the addition of Na-MMT significantly reduced the hydraulic conductivity (HC) of sandy soil consolidated.

Improvement of a sandy soil by enzymatic calcium carbonate precipitation

2018 ◽  
Vol 171 (1) ◽  
pp. 3-15 ◽  
Author(s):  
João P. S. F. Carmona ◽  
Paulo J. Venda Oliveira ◽  
Luís J. L. Lemos ◽  
António M. G. Pedro
Keyword(s):  
Calcium Carbonate ◽  
Sandy Soil ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation

scholarly journals Biostabilization of a Sandy Soil Using Enzymatic Calcium Carbonate Precipitation

2016 ◽  
Vol 143 ◽  
pp. 1301-1308 ◽  
Author(s):  
João P.S.F. Carmona ◽  
Paulo J. Venda Oliveira ◽  
Luís J.L. Lemos
Keyword(s):  
Calcium Carbonate ◽  
Sandy Soil ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation

scholarly journals Improving the Erosion Resistance Performance of Pisha Sandstone Weathered Soil Using MICP Technology

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1112
Author(s):  
Yanxing Wang ◽  
Chi Li ◽  
Cuiyan Wang ◽  
Yu Gao
Keyword(s):  
Calcium Carbonate ◽  
Wind Erosion ◽  
Erosion Resistance ◽  
Carbonate Content ◽  
Calcium Carbonate Precipitation ◽  
Undisturbed Soil ◽  
Soil Particles ◽  
Weathered Soil ◽  
Before And After ◽  
Internal Mechanism

In this study, we applied microbial induced calcium carbonate precipitation (MICP) technology to improve the undesirable characteristics of Pisha sandstone weathered soil that collapses easily upon environmental erosion. Through disintegration tests and wind erosion tests, the anti-water scour and anti-sand erosion performance of the weathered soil was tested before and after the improvement. Combined with an analysis of the physical properties and pore structure of the samples, this paper analyzes the internal mechanism by which MICP technology improves the poor characteristics of the soil. The results show that after improvement with the use of MICP technology, effective cementation is formed between the soil particles to form a solidified material with a strength of up to 1 MPa with a precipitated carbonate content of up to 15%, which effectively improves the water erosion resistance and wind erosion resistance. The disintegration rate of the improved soil sample was only 1.95% at the 30th minute, the remolded soil completely disintegrated, and the undisturbed soil reached 39.64%. The wind erosion resistance of the improved sample is improved, and its coefficient at a 30° erosion angle is increased roughly 20-fold on average when the wind speed is 31 m/s. The internal mechanism of the improved soil when it comes into contact with water and wind is that the induced calcium carbonate crystals fill the pores of the soil particles and adhere to and bridge between soil particles for effective cementation. When the soil expands after water invasion or the soil is destroyed after external erosion, the cementation of mineral crystals on the particles can resist the expansion force and punching force so as to improve the soil’s overall anti-erosion performance.

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