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Bio-bricks: Biologically cemented sandstone bricks

机译：生物砖：生物水泥砂岩砖

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The cementation of sand into sandstone through microbial activity is a novel technology with a wide range of possible applications. The cementation process involves the introduction of bacteria and nutrients to sand, and through bacterial processes calcite precipitation binds particles together, ultimately creating a sandstone material. This technology could provide a new, more sustainable building material in the form of "bio-bricks". This paper describes the treatment technique as well as results from testing after brick manufacturing. Bricks were tested to determine compression (p-wave) wave velocity, unconfined compression strength, and calcite concentration. P-wave velocity, stiffness, strength, and calcite content of bio-bricks all increase with further treatment of bacteria and cementation media. Results show that bio-bricks can have strengths ranging from 1 MPa to 2 MPa. Bio-bricks are comparable in terms of stress and stiffness to bricks prepared with the more conventional cement and hydraulic lime additives.
机译：通过微生物活动将沙子胶结成砂岩是一种新颖的技术，具有广泛的应用前景。胶结过程涉及将细菌和养分引入到沙子中，通过细菌过程，方解石沉淀将颗粒结合在一起，最终形成砂岩材料。这项技术可以以“生物砖”的形式提供一种新的，更可持续的建筑材料。本文介绍了处理技术以及制砖后的测试结果。测试了砖块以确定压缩（p波）波速，无限制压缩强度和方解石浓度。随着对细菌和胶结介质的进一步处理，生物砖的纵波速度，刚度，强度和方解石含量均增加。结果表明，生物砖的强度范围为1 MPa至2 MPa。就强度和刚度而言，生物砖可与使用更常规的水泥和水硬石灰添加剂制备的砖相比。

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