Effective use of fly ash slurry as fill material.
Effective use of fly ash slurry as fill material.
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DOI：
10.1016/s0304-3894(00)00205-3
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发表时间：
2000-09
影响因子：
13.6
通讯作者：
S. Horiuchi;M. Kawaguchi;K. Yasuhara
中科院分区：
文献类型：
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作者：
S. Horiuchi;M. Kawaguchi;K. Yasuhara
大力提高粉煤灰利用率；然而，总量的 50% 被丢弃在陆地和海洋中。最近报道了一些关于将浆状煤粉煤灰用于土木工程材料（例如用于结构填充和回填）的尝试。作者对这个问题进行了超过 15 年的研究，并通过实验室测试和施工工程报告了其在 (1) 水下填充、(2) 轻质回填和 (3) 轻质结构填充方面的潜力。本文概述了浆料获得的结果，重点关注以下内容。 (1) 与其他方法相比，通过浆料投放回收的粉煤灰具有较低的压缩性、较高的粉煤灰密度和较高的强度。这种更高的强度增加了地震期间抗液化的稳定性。 (2) 粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰粉煤灰(3) 粉煤灰再生地面的稳定性可以通过增加密度来提高，也可以通过添加水泥来增强强度。 （4）通过人工岛建设项目获得的技术数据表明，粉煤灰浆液在力学性能方面具有优势，例如较高的抗滑动破坏稳定性、足够的地面强度以及节省成本等。 (5) 所放置的浆液中的渗滤液浓度低于日本环境法规定的浓度。 (6)为了扩大粉煤灰浆料的轻质填充应用，对空气泡沫、水泥和粉煤灰的混合物进行了研究。测试结果表明该材料具有足够的耐久性，可抵抗蠕变失效。这种材料随后被用作高层建筑周围的轻质结构填充物，并表现出足够的质量。从以上数据可以看出，粉煤灰浆液可以在土木工程中得到有效利用。
A lot of effort has been put into increasing coal ash utilization; however, 50% of total amount is disposed of on land and in the sea. Several attempts have been reported recently concerning slurried coal fly ash use for civil engineering materials, such as for structural fill and backfill. The authors have studied this issue for more than 15 years and reported its potential for (1) underwater fills, (2) light weight backfills, and (3) light weight structural fills, through both laboratory tests and construction works. This paper is an overview of the results obtained for slurry, focusing on the following. (1) Coal fly ash reclaimed by slurry placement shows lower compressibility, higher ground density, and higher strength than by the other methods. This higher strength increases stability against liquefaction during earthquake. (2) Higher stability of the fly ash ground formed by slurry placement is caused by higher density and its self-hardening property. (3) Stability of fly ash reclaimed ground can be increased by increasing density and also by strength enhancement by cement addition. (4) Technical data obtained through a man-made island construction project shows the advantages of fly ash slurry in terms of mechanical properties such as higher stability against sliding failure, sufficient ground strength, and also in terms of cost saving. (5) Concentration in leachates from the placed slurry is lower than the Japanese environmental law. (6) In order to enlarge the fly ash slurry application toward a lightweight fill, mixtures of air foam, cement and fly ash were examined. Test results shows sufficient durability of this material against creep failure. This material was then used as lightweight structural fill around a high-rise building, and showed sufficient quality. From the above data, it can be concluded that coal fly ash slurry can be effectively utilized in civil engineering projects.