Development of a new hempcrete 'wall' formulation with advanced hygrothermal properties

仅建筑物一项就占人类温室气体排放总量的40%左右。新的生物复合材料有可能大大减少与建筑有关的具体能源，因为在它们的生命周期中，它们通过光合作用吸收大气中的二氧化碳，而且通常可以回收或堆肥，减少拆除后的废物影响。大麻-石灰混凝土是一种特别有前途的生物复合材料，它具有许多独特的优点，包括：优异的储热和热性能；高隔音性能；可达到建筑规范标准；良好的密封性；低热桥；高湿度缓冲；良好的耐火性；抗虫害；高耐久性；高固碳；简化和减少木结构施工中涉及的层数和工序。然而，混凝土的性能和性能在很大程度上取决于配料数量和粘结剂类型的规格。拟议研究的总体目标是开发一种新的混凝土“墙”配方，该配方将具有优异的湿热性能，特别适合在原住民和偏远的北方社区应用。为实现这一目标将采取的具体步骤包括：(A)表征大麻赫德和粘结剂的物理和热性能；(B)开发大麻前处理工艺；(C)考虑可获得性、价格和体现能量，确定粘结剂的最佳选择；(D)确定显影剂中大麻赫德、粘合剂和水的确切数量；拟议研究项目的潜在社会、经济和效益很多，最重要的包括：(1)通过减少与建筑材料生产有关的能源消耗和碳排放，促进实现《巴黎协定》；(2)开发负担得起的当地材料，提供良好的室内空气质量，从而对人民健康产生积极影响；以及(3)促进建筑领域和材料生产的可持续发展。

Buildings alone are responsible for around 40% of all human greenhouse emissions. New bio-composite materials offer the potential to significantly reduce the embodied energy related to the construction of buildings as during their lifetime they absorb atmospheric carbon dioxide through photosynthesis and can often be recycled or composted reducing their waste impact after demolition. Hemp-lime concrete, generically called "Hempcrete", is a particularly promising bio-composite material which can have many distinct advantages including: excellent thermal and heat storage properties; high acoustic performance; achievable building code standard; excellent level of airtightness; low thermal bridging; high moisture buffering; good fire resistance; pest resistant; high durability; high carbon sequestration; simplification and reduction in the number of layers and processes involved in timber-frame construction. However, hempcrete properties and performance greatly depend on specification of the ingredient amounts and the type of binder. The overall goal of the proposed research is to develop a new hempcrete "wall" formulation that will have excellent hygrothermal properties, and which is particularly suitable for applications in First Nations and remote Northern communities. The specific steps that will be undertaken to achieve this goal include: (a) characterize physical and thermal properties of hemp hurd and binders; (b) develop hemp pretreatment process; (c) identify the best option for the binder considering availability, price and embodied energy, (d) determine exact quantities of hemp hurd, binder and water within develop mixes; and (e) characterize physical, thermal and mechanical properties of developed hempcrete mixes.The potential social, economic and benefits of the proposed research project are numerous and the most important include: (1) contribute to achieving the Paris Agreement by reducing energy consumption and carbon emissions related to the production of building materials; (2) develop affordable, local material that provides excellent indoor air quality and thus has a positive effect on peoples' health; and (3) promote sustainable development in construction field and material production.