ABSTRACT

In this work, the aim was to study the influence of cellulose Kraft pulps, natural rubber latex, and metakaolin in the optimization of the values of flexural strength and water absorption of cementitious composites through the design of experiments (central composite design) at 28 days of age. According to the design of experiments, the composite with 1.252% cellulose, 1.126% latex and 37.06% metakaolin presented the optimized value of the modulus of elasticity (21.89 GPa). In addition, an increase in the values of modulus of elasticity for composites with lower cellulose contents was observed. Latex and metakaolin provided small variations in the modulus of elasticity. For water absorption, only cellulose exhibited significant interference. Thus, lower values of water absorption were found for lower concentrations of cellulose. The optimized composite that showed less water absorption was with 1.5% cellulose, 0.02% latex, and 4% metakaolin, with 10.28% absorption. In view of the results obtained, it was concluded that the use of central composite design, the molding method adopted, and the limits of constituents used allowed the optimization the values studied responses (modulus of elasticity, and absorption).

摘要

在这项工作中，目的是通过 28 天的实验设计（中心复合设计）研究纤维素牛皮纸浆、天然橡胶胶乳和偏高岭土对优化胶凝复合材料抗弯强度和吸水率值的影响。年龄。根据实验设计，1.252%纤维素、1.126%乳胶和37.06%偏高岭土的复合材料呈现出弹性模量的优化值（21.89 GPa）。此外，观察到纤维素含量较低的复合材料的弹性模量值增加。乳胶和偏高岭土的弹性模量变化很小。对于吸水性，只有纤维素表现出明显的干扰。因此，发现较低浓度的纤维素吸水率较低。吸水率较低的优化复合材料含有 1.5% 的纤维素、0.02% 的乳胶和 4% 的偏高岭土，吸水率为 10.28%。鉴于所获得的结果，得出的结论是，中心复合设计的使用、采用的成型方法以及所用成分的限制允许优化研究响应的值（弹性模量和吸收）。