Brzyski Przemysław
Faculty of Civil Engineering and Architecture, Lublin University of Technology, 40 Nadbystrzycka Str., 20-618 Lublin, Poland.
Materials (Basel). 2021 Nov 10;14(22):6775. doi: 10.3390/ma14226775.
Organic admixtures based on polysaccharides are used in construction for modifying the properties of mortars and concretes. Gum arabic is an example of a polysaccharide-based biopolymer. The aim of the article was to investigate the possibilities of improving the strength parameters of a binder paste based on hydrated lime and metakaolin. The paste was modified with powdered gum arabic at 1%, 3% and 5% (by mass) as a partial replacement for the binder mix. The influence of the admixture on the pore size distribution as well as flexural and compressive strength was investigated. The admixture enhanced the total porosity of the paste, increasing the pore diameter compared with the reference formulation. The increase in porosity, in turn, did not reduce the mechanical strength. Conversely, the admixture in the amount of 3% and 5% caused a significant increase in the flexural (by about 300% in relation to reference paste) and compressive strengths (by 25% and 60%, respectively). The tested pastes were used as a binder in a composite based on hemp shives. The influence of binder modification on the water absorption and compressive strength of hemp concrete was tested. The strength of the composite soaked in water was also tested. The modification of the binder with gum arabic in the amount of 3% and 5% increased the compressive strength of hemp concrete (not soaked in water) by 53% and 92%, respectively and reduced the mass absorptivity by 6.6% and 10.4%, respectively.
基于多糖的有机外加剂用于建筑领域，以改善砂浆和混凝土的性能。阿拉伯树胶是一种基于多糖的生物聚合物实例。本文的目的是研究提高基于熟石灰和偏高岭土的粘结剂浆体强度参数的可能性。用1%、3%和5%（质量）的阿拉伯树胶粉末对浆体进行改性，作为粘结剂混合物的部分替代品。研究了外加剂对孔径分布以及抗折和抗压强度的影响。该外加剂提高了浆体的总孔隙率，与参考配方相比，孔径增大。孔隙率的增加反过来并没有降低机械强度。相反，3%和5%用量的外加剂使抗折强度（相对于参考浆体提高约300%）和抗压强度（分别提高25%和60%）显著增加。测试的浆体用作基于麻屑的复合材料中的粘结剂。测试了粘结剂改性对麻屑混凝土吸水率和抗压强度的影响。还测试了浸泡在水中的复合材料的强度。3%和5%用量的阿拉伯树胶对粘结剂的改性分别使麻屑混凝土（未浸泡在水中）的抗压强度提高了53%和92%，并使质量吸收率分别降低了6.6%和10.4%。
