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Effect of carbon dioxide on chloride penetration and chloride ion diffusion coefficient of blended Portland cement mortar

机译：二氧化碳对硅酸盐水泥砂浆氯离子渗透率和氯离子扩散系数的影响

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摘要

This paper presents a study of the effects of carbon dioxide on chloride penetration and chloride ion diffusion coefficient of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan and blends of pozzolans. Mortars with constant water to cement ratio and similar flow were used for the tests. This research used accelerated testing environment with 5% CO_2. Rapid chloride penetration test (RCPT), modified rapid migration test (MRMT) and chloride penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined on the mortars with and without exposure to carbon dioxide environment. For OPC mortar, the exposure to carbon dioxide environment does not lower the chloride penetration resistance of mortar as measured by RCPT, MRMT and NaCl immersion test. However, the exposure to carbon dioxide significantly decreases the chloride penetration resistance of mortar containing pozzolans. This decrease is related to the replacement level of pozzolans.
机译：本文研究了二氧化碳对掺有磨碎的棕榈油燃料灰（POA），磨碎的稻壳灰（RHA）和分类粉煤灰（细粉煤灰）的波特兰水泥砂浆中氯离子渗透率和氯离子扩散系数的影响的研究。 F A）。普通的波特兰水泥（OPC）被火山灰和火山灰混合物部分替代。试验使用恒定水灰比和类似流量的砂浆。这项研究使用了含5％CO_2的加速测试环境。在砂浆的3％NaCl溶液中浸泡30天后，在有或没有暴露于二氧化碳的环境下，测定了氯离子的快速渗透测试（RCPT），改进的快速迁移测试（MRMT）和氯离子的渗透深度。对于OPC砂浆，通过RCPT，MRMT和NaCl浸没测试测量，暴露于二氧化碳环境不会降低砂浆的耐氯化物渗透性。然而，暴露于二氧化碳显着降低了含有火山灰的砂浆的耐氯化物渗透性。这种减少与火山灰的替换水平有关。

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