基于复合粘结剂的外部化学侵蚀下的耐久性自密实砂浆

Pub Date : 2024-07-27 DOI:10.32047/cwb.2024.29.1.5
Benguit Amar, Aboubakeur Boukhelkhal, Azzouz Lakhdar
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引用次数: 0

摘要

混凝土/砂浆的性能与其成分和水灰比密切相关。使用普通硅酸盐水泥[OPC]作为粘结剂会增加水化热、水泥成本和二氧化碳排放量。因此,通过减少 OPC 的用量并引入矿物添加剂来使用复合粘结剂不失为一种有效的解决方案。在这项研究中,用不同比例(5%、10%、15% 和 20%)的大理石粉 [MP] 部分替代了 OPC,并研究了 MP 对暴露于化学侵蚀的自密实砂浆 [SCM] 耐久性的影响。试验使用了硫酸钠 [Na2SO4] 和盐酸 [HCl] 两种侵蚀性溶液。溶液的用量分别为 5%和 1%。结果表明,使用大理石粉有利于提高单片机对侵蚀性溶液的抗性。添加 20% 的大理石粉可在 180 天内将抗硫酸钠侵蚀的能力提高 46%。使用含量在 10% 到 20% 之间的大理石粉可以减少 1% 到 0.47% 的质量损失。
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Durability self-compacting mortar under external chemical attacks based on composite binder
The performance of concrete / mortar is specially related to their composition and water to cement ratio. The use of Ordinary Portland cement [OPC] as binder increases the hydration heat and cost of cement and CO2 emissions. So the use of composite binder by reducing the amount of OPC and introducing mineral additions can be a useful solution. In this study, OPC was partially substituted with marble powder [MP] at various percentages (5, 10, 15 and 20%) and the effect of MP on the durability of self compacting mortars [SCM] exposed to chemical aggressions was investigated. Two aggressive solutions were used sodium sulfate [Na2SO4] and hydrochloric acid [HCl]. The dosages of the solutions were 5 and 1%, respectively. The results revealed that the use of marble powder is beneficial for improving the resistance of SCM to aggressive solutions. Adding 20% MP increased the resistance against sodium sulfate attack by 46% at 180 days. Using MP with content ranged between 10 to 20% was found to reduce mass loss by 1 to 0.47%.
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