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Prediction Models for the Mechanical Properties of Self-Compacting Concrete with Recycled Rubber and Silica Fume

机译：再生橡胶和硅粉自密实混凝土力学性能的预测模型

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The paper aims to investigate the influence of waste tire rubber and silica fume on the fresh and hardened properties of self-compacting concrete (SCC) and to design multivariate regression models for the prediction of the mechanical properties of self-compacting rubberized concrete (SCRC). For this purpose, 21 concrete mixtures were designed. Crumb rubber derived from end-of-life tires (grain size 0.5–3.5 mm) was replaced fine aggregate by 0%, 5%, 10%, 15%, 20%, 25%, and 30% of total aggregate volume. Silica fume was replaced cement by 0%, 5%, and 10% of the total cement mass. The optimal replacement level of both materials was investigated in relation to the values of the fresh properties and mechanical properties of self-compacting concrete. Tests on fresh and hardened self-compacting concrete were performed according to the relevant European standards. Furthermore, models for predicting the values of the compressive strength, modulus of elasticity, and flexural strength of SCRC were designed and verified with the experimental results of 12 other studies. According to the obtained results, mixtures with up to 15% of recycled rubber and 5% of silica fume, with 28 days compressive strength above 30 MPa, were found to be optimal mixtures for the potential future investigation of reinforced self-compacting rubberized concrete structural elements.
机译：本文旨在研究废旧轮胎橡胶和硅粉对自密实混凝土（SCC）的新鲜和硬化性能的影响，并设计多元回归模型来预测自密实涂胶混凝土（SCRC）的力学性能。 。为此，设计了21种混凝土混合物。将来自报废轮胎（粒度为0.5-3.5毫米）的碎胶替换为细集料，分别占总集料量的0％，5％，10％，15％，20％，25％和30％。用水泥总质量的0％，5％和10％代替硅粉。根据自密实混凝土的新鲜性能和机械性能，研究了两种材料的最佳替代水平。根据欧洲相关标准对新鲜和硬化的自密实混凝土进行了测试。此外，还设计了预测SCRC的抗压强度，弹性模量和弯曲强度值的模型，并与其他12项研究的实验结果进行了验证。根据获得的结果，发现具有高达15％的再生橡胶和5％的硅粉的混合物，并且在30 MPa以上的压力下具有28天的抗压强度，是用于增强自密实橡胶化混凝土结构的潜在未来研究的最佳混合物。元素。

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