赞比亚混凝土生产中使用的轮胎资源
摘要
可避免地导致了对天然材料的不断开发,以生产混凝土生产所需的成分。其结果是原始原料的消耗和环境退化
的影响增加。在这项研究中,对在混凝土生产中使用再生橡胶轮胎作为粗骨料的部分替代品进行了研究。再生
废轮胎橡胶由于其重量轻、弹性好、能量吸收好、隔音隔热性能好,在建筑行业是一种很有前途的材料。文献
表明,随着轮胎含量的增加,橡胶化混凝土的强度显著降低。此外,据报道,可加工性和粘结性能也有所降低。
因此,在天然骨料的更换过程中,有必要控制混凝土的强度损失和其他参数。本研究旨在研究旧轮胎橡胶增强
混凝土的压缩、拉伸和粘结性能。实验室实验的测试结果能够确定机械、物理和耐久性特性,以及确定用废橡
胶代替普通骨料作为混凝土骨料的程度。通过用经处理的碎废轮胎橡胶替代选定百分比的骨料,生产了三种混
凝土,C15、C20 和 C25。粗骨料的替代率分别为 5%、15% 和 25%。碎橡胶骨料的尺寸从 20mm 到 19mm 不等。
对正常和处理过的橡胶改性混凝土的新拌混凝土混合物进行了坍落度、渗透性和容重测试。同样,对硬化混凝
土进行了抗压强度、抗拉劈裂强度、粘结试验和耐酸侵蚀耐久性试验。研究表明,橡胶改性混凝土优于标准混
凝土,粗骨料的替代率高达 15%。在 15% 的替换率下,仅确定了 0.1% 的强度损失。随着 25% 的更换,物业
明显减少。然而,橡胶改性混凝土在高温下逐渐开裂,表现更好。赞比亚有可能生产橡胶改性混凝土产品,从
而减轻过度开采天然骨料和废弃橡胶轮胎造成的不利影响。
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