Seawater based MICP cements two/one-phase cemented sand blocks

IF 4.3 2区工程技术 Q1 ENGINEERING, OCEAN

Applied Ocean Research Pub Date : 2022-01-01 DOI:10.1016/j.apor.2021.102972

Xiaoniu Yu , Hui Rong

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引用次数: 45

Abstract

The Sporosarcina pasteurii strains can grow and multiply in seawater medium and have certain urease activity. The two-phase and one-phase cementation methods can be used for the construction of ocean islands and reefs far away from the mainland in seawater seawater based MICP (Microbial-Induced Carbonate Precipitation). The compressive strength, carbonates content and porosity of sand blocks cemented by seawater based MICP with two-phase and one-phase methods are measured and compared. The results show that the strength and carbonates content of sand blocks with two-phase biocementation are greater than that of one-phase. The SEM images show that the principle of seawater based MICP cementing loose sand blocks is that carbonates particles grow between the sand particles, and them act as a bridge to bind the loose sand particles into a whole. The seawater based UPB of different pH can induce calcium carbonate deposition at different time. The seawater based UPB of different pH can be selected according to the actual project to reinforce the island reef sand foundation and prepare building materials under one-phase biocementation.

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海水基MICP水泥两相/单相胶结砂块

该菌株能在海水培养基中生长繁殖，并具有一定的脲酶活性。两相胶结法和单相胶结法可用于在海水中建造远离大陆的海洋岛礁。对两相法和单相法海水基MICP胶结砂块的抗压强度、碳酸盐含量和孔隙度进行了测试和比较。结果表明:两相生物胶结砂块的强度和碳酸盐含量均大于单相;SEM图像表明，海水基MICP固井松散砂块的原理是碳酸盐颗粒在砂粒之间生长，起到了将松散砂粒粘结成整体的桥梁作用。不同pH的海水基UPB在不同时间诱导碳酸钙沉积。可根据工程实际选择不同pH值的海水基UPB，加固岛礁砂基础，制备一期生物胶结下的建材。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Ocean Research 地学-工程：大洋

CiteScore

8.70

自引率

7.00%

发文量

316

审稿时长

59 days

期刊介绍： The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.