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Influence of various parameters on Li_2CO_3 against alkali-silica reaction

机译：各种参数对Li_2CO_3抗碱二氧化硅反应的影响

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This paper reported the results of an experimental program, which aimed to investigate influence of various parameters on Li_2CO_3 against alkali-silica reaction. To evaluate the effect of the temperature on the ASR suppression due to Li_2CO_3, mortar bars were cured at 150, 80, and 20 ℃, respectively. To determine the effect of the characteristic of the aggregates on ASR suppression due to Li_2CO_3, mortar bars with different aggregates were cast and tested. In the next series of tests, the changes in the expansion of mortar bars with different dosages of lithium were examined to find out the pessimum limit, if any. Also, micro-structural observations were carried out on polished sections of mortar bars with and without lithium using a scanning electron microscope combined with an X-ray energy dispersive spectrum. It was found that the high-temperature treatment did not significantly modify the chemical reactions involved, and only accelerated the expansion rate, when lithium compounds were used to inhibit ASR expansion. The study also revealed that the efficacy of lithium in reducing expansion is a strong function of both the alkali-reactivity and the mineral characteristics of the aggregates. It was not always the truth that more reactive aggregates require more lithium to inhibit ASR effectively. In addition, Liuhe aggregate, with microcrystal-line quartz as its main alkali-reactive minerals, used in this investigation had a pessimum proportion of Li/(Na + K) molar ratio about 0.3. In addition, the interior form and chemical reaction products of mortar bars without and with sufficient lithium against alkali-silica reaction were quite different from each other.
机译：本文报道了一个实验程序的结果，该程序旨在研究各种参数对Li_2CO_3对抗碱-二氧化硅反应的影响。为了评估温度对Li_2CO_3引起的ASR抑制的影响，分别在150、80和20℃下固化砂浆棒。为了确定骨料特性对Li_2CO_3引起的ASR抑制的影响，浇铸和测试了具有不同骨料的砂浆棒。在接下来的一系列测试中，研究了不同剂量锂的砂浆棒膨胀的变化，以确定是否存在悲观极限。此外，使用结合了X射线能量色散谱的扫描电子显微镜，对有或没有锂的砂浆棒的抛光部分进行了微观结构观察。发现当使用锂化合物抑制ASR膨胀时，高温处理并未显着改变所涉及的化学反应，而仅加速了膨胀速率。研究还表明，锂在减少膨胀方面的功效是聚集体的碱反应性和矿物质特性的强大功能。活性更高的聚集体需要更多的锂来有效抑制ASR并非总是如此。此外，本研究中使用的以微晶线石英为主要碱反应性矿物的六合骨料的Li /（Na + K）摩尔比为约0.3。另外，没有和有足够的锂对抗碱-二氧化硅反应的砂浆棒的内部形态和化学反应产物彼此之间有很大的不同。

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