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Addition of biochars to concrete mixtures in replacement of portland cement for development of sustainable concrete.****

在混凝土混合物中添加生物炭以替代波特兰水泥，以开发可持续混凝土。****

基本信息

批准号：
537660-2018
负责人：
MacQuarrie, Stephanie
金额：
$ 1.82万
依托单位：
Cape Breton University
依托单位国家：
加拿大
项目类别：
Engage Grants Program
财政年份：
2018
资助国家：
加拿大
起止时间：
2018-01-01 至 2019-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=658370
关键词：
Addition biochars concrete mixtures replacement

项目摘要

Quality Concrete Ltd. is devoted to implementing sustainable materials for their concrete mixing. Currently up to 20 % of their concrete is held together by a paste made from a mixture of Portland Cement and water. This paste binds the gravel, rock, and sand (aggregates) together to give a malleable, easy to use concrete mixture when wet, and a strong, water resistant product when dry. Portland cement is manufactured by heating caustic limestone with clay in an energy intensive mill at very high temperatures (about 1450°C). This firing process utilizes high quantities of fuel, typically coal or petroleum coke. The process of generating portland cement is unsustainable and exposure to many of its ingredients is potentially dangerous therefore the concrete industry in very interested in sustainable, healthier alternatives. Since Portland cement is a main ingredient that gives the concrete its ideal physical characteristics, it can not be completely replaced, but certain additives can be used to reduce the amount of Portland cement used. Recent studies have shown that reusable natural by-products like charcoal made from biomass can be implemented in the concrete manufacturing process by replacing up to 10% of Portland cement to produce a lightweight, more feasible, concrete product with uniform porosity and increased comprehensive strength. This proposal focus' on identifying local biomass sources (crab, forestry) for conversion to biochar and collaboration with Quality Concrete to test for applicability, stability, strength and durability of the resulting concrete with the addition of various concentrations and types of biochar.

优质混凝土有限公司致力于实施可持续材料的混凝土搅拌。目前，高达20%的混凝土是由波特兰水泥和水的混合物制成的糊状物粘合在一起的。这种浆料将砾石、岩石和沙子（骨料）粘合在一起，在潮湿时形成一种可塑性强、易于使用的混凝土混合物，在干燥时形成一种坚固、防水的产品。波特兰水泥是在一个能源密集型的工厂里，在非常高的温度（约1450°C）下，用粘土加热苛性石灰石制成的。这种燃烧过程使用大量的燃料，通常是煤或石油焦。生产波特兰水泥的过程是不可持续的，接触其中的许多成分是潜在的危险，因此混凝土行业对可持续的、更健康的替代品非常感兴趣。由于硅酸盐水泥是使混凝土具有理想物理特性的主要成分，所以它不能被完全取代，但可以使用某些添加剂来减少硅酸盐水泥的使用量。最近的研究表明，由生物质制成的木炭等可重复使用的天然副产品可以在混凝土制造过程中实现，通过替代高达10%的波特兰水泥，生产出重量轻、更可行、孔隙率均匀、综合强度提高的混凝土产品。该提案的重点是确定当地的生物质来源（螃蟹、林业），将其转化为生物炭，并与Quality Concrete合作，通过添加不同浓度和类型的生物炭，测试所得混凝土的适用性、稳定性、强度和耐久性。