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首页> 外文会议>International Symposium on East Asian Resources Recycling Technology（EARTH 2005); 20051109-15; Beijing(CN) >Effect of Fly Ash Addition on Lightweight Aggregate Formation
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Effect of Fly Ash Addition on Lightweight Aggregate Formation

机译：粉煤灰添加对轻骨料形成的影响

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摘要

Lightweight aggregate has extensive application in civil engineering. Fly ashes discharged from incinerators have been proven to be hazardous to human and the environment. In this study incinerator fly ashes were mixed with silica and aluminum oxide to prepare lightweight aggregate through sintering and vesicant processes at various temperature intervals between 1,100-1,200℃ for 25 minutes. Chemical compositions in two fly ashes were determined via total acid digestion followed by measurement using inductively coupled plasma-atomic emission spectrometer. The weight mixing ratio of silica: aluminum oxide: fly ash was 45:15: 40, and a pressure of 3,000 psi was applied to the powder mixtures to shape the mixture followed by the sintering and vesicant processes. The results indicate that the best performance as signaled by the lowest bulk density was obtained by sintering at 1,100-1,140℃. Their bulk density is about 1.00-1.60 g cm~(-3). There is a tendency for the bulk density to increase in the 1,140-1,200℃ region, compared to the 1100-1140℃. Greater content of certain iron, sulfur, and phosphorus compounds in the mixture generated better vesicant activity, and thus lowered the product density.
机译：轻骨料在土木工程中有广泛的应用。从焚化炉排出的粉煤灰已被证明对人体和环境有害。在这项研究中，将焚烧炉粉煤灰与二氧化硅和氧化铝混合，通过烧结和发泡剂工艺，在1,100-1,200℃之间的不同温度间隔下25分钟制备轻质骨料。通过总酸消解，然后使用感应耦合等离子体原子发射光谱仪进行测量，确定了两个飞灰中的化学成分。二氧化硅：氧化铝：粉煤灰的重量混合比为45∶15∶40，并对粉末混合物施加3,000psi的压力以使混合物成形，随后进行烧结和发泡剂处理。结果表明，在1,100-1,140℃下烧结可获得最佳的性能，最低的堆密度。它们的堆积密度约为1.00-1.60g cm·（-3）。与1100-1140℃相比，在1,140-1,200℃区域内，堆积密度有增加的趋势。混合物中某些铁，硫和磷化合物的含量较高，可产生更好的泡沫活性，因此降低了产品密度。

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