ABSTRACT

This research aims to study the influence of organic additive and aggregate grain size in lime mortar hardening for producing compatible, high-performance and eco-friendly materials for conservation and restoration of heritage structures. Mortar mix with lime to sand ratio of 1:3 by mass and water to binder ratio of 0.75 was considered. Ficus Carica (Moraceae), commonly known as Fig fruit, was used as an organic additive in the mortar mix at 2, 4 and 6% in volume. River sand grounded for 5, 10 and 15 minutes, turning in changes in grain-size distrubution, was used in the mortar mix. Investigations on mortars were performed after 90 curing days; physical and mechanical properties were evaluated, along with mineralogical changes due to organic addition; the influence of organic and aggregate grading in carbonation rate was also assessed. Results indicate that the aggregate with retention value 45 ± 3% in grades between 2 mm to 425 micron and 425 micron to 75 micron; and the addition of organic additive at 4% in volume represents the optimum mix able to assure significant enhansement in carbonation rate and mechanical resistance. Polysaccharides in organic played the central role in the mineralogical transformation responsible for the measured enhanced performances.

摘要

本研究旨在研究有机添加剂和骨料粒度对石灰砂浆硬化的影响，以生产用于保护和修复遗产结构的相容、高性能和环保材料。砂浆混合物的石灰与砂的质量比为 1:3，水与粘合剂的比为 0.75。无花果（桑科），俗称无花果果实，在砂浆混合物中用作有机添加剂，体积为 2%、4% 和 6%。在砂浆混合物中使用研磨 5、10 和 15 分钟的河沙，改变粒度分布。养护 90 天后对砂浆进行调查；评估了物理和机械性能，以及由于添加有机物引起的矿物学变化；还评估了有机和骨料分级对碳化率的影响。结果表明，在2毫米至425微米和425微米至75微米之间，保留值45±3%的骨料；添加 4% 体积的有机添加剂代表了能够确保显着提高碳酸化率和机械阻力的最佳混合物。有机物中的多糖在矿物转化中发挥了核心作用，从而导致了测量的增强性能。