Bio-additives in lime-based mortars: An investigation of the morphology performance

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-05 DOI:10.1016/j.conbuildmat.2025.141177

Petrini Kampragkou , Maxime Dabekaussen , Vasiliki Kamperidou , Maria Stefanidou

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引用次数: 0

Abstract

The utilization of the abundant, lightweight and eco-friendly bio-materials in the construction field could prove a potentially profitable practice, since huge amounts of agricultural and forest wastes could be reused and stop constituting an environmental burden any more. In this context, the in depth understanding of the mechanisms influencing the functionality of the bio-products in mortar mixtures, such as their implementation technique, chemical composition or their morphology (fibres length, diameter, etc), would contribute to the strengthening of this bio-construction procedure. In the current study, seagrass, bamboo and cypress tree bark in the form of fibres and powders were incorporated into lime-pozzolan mortar mixtures, at a stable addition rate of 1.5 % v/v, towards the comprehension of the bio-additives’ form (shape) and type performance in the fresh and harden properties of the produced composites. The analysis of the experimental results after 28 and 90 hardening days revealed the beneficial role of bio-additives in the volume stability, hygrothermal and post cracking behavior (in certain cases), lightness and capillary absorption performance of the mortars compared to the reference case, in contrast to the recorded mechanical behavior impairment (in terms of flexural, compressive and tensile strength). Regarding the bio-additives morphology effect, the presence of fibre shaped ones in most cases favored the dimension stability and mechanical characteristics (before and after the crack-formation) of the reinforced samples, while the powder-formed additives decreased the porosity, capillary pores connection (during ageing) and water vapor resistance factor μ of the specimens (in most cases). Therefore, the fine bio-particles (powders) displayed higher coherence with the lime-based matrix compared to the fibre cases. Nevertheless, bio-additives prove their feasible employment as mortar reinforcing pathways depending to the properties required.

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石灰基砂浆中生物添加剂的形态性能研究

在建筑领域利用丰富、轻质和生态友好的生物材料可能是一种有利可图的做法，因为大量的农业和森林废弃物可以重新利用，不再构成环境负担。在这种情况下，深入了解影响砂浆混合物中生物产品功能的机制，如实施技术、化学成分或形态（纤维长度、直径等），将有助于加强这种生物建筑程序。在当前的研究中，海草、竹子和柏树皮以纤维和粉末的形式被添加到石灰-水泥砂浆混合物中，稳定添加率为 1.5 % v/v，目的是了解生物添加剂的形态（形状）和类型在所生产的复合材料的新鲜和硬化性能中的表现。对 28 天和 90 天硬化后的实验结果进行的分析表明，与参照物相比，生物添加剂在砂浆的体积稳定性、湿热和开裂后行为（在某些情况下）、轻质和毛细管吸收性能方面发挥了有益的作用，而所记录的机械行为损伤（在抗弯、抗压和抗拉强度方面）则与此相反。关于生物添加剂形态的影响，在大多数情况下，纤维状添加剂的存在有利于增强样品的尺寸稳定性和机械特性（裂缝形成前后），而粉末状添加剂则降低了试样的孔隙率、毛细孔连接（老化过程中）和水蒸气阻力系数 μ（在大多数情况下）。因此，与纤维试样相比，细生物颗粒（粉末）与石灰基质的一致性更高。不过，生物添加剂证明了其作为砂浆增强途径的可行性，这取决于所需的性能。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.