Ettringite as a factor causing structural strengthening of fluvial sand from the Praski terrace (Warsaw, Poland)

IF 1.1 4区 地球科学 Q3 GEOLOGY
Paweł Rydelek, A. Bąkowska, Krzysztof Cabalski
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引用次数: 0

Abstract

: Zawrzykraj, P., Rydelek., P., Bąkowska, A. and Cabalski, K. 2022. Ettringite as a factor causing structural strengthening of fluvial sand from the Praski terrace (Warsaw, Poland). Acta Geologica Polonica , 72 (4), 519–528. Warszawa. Engineering activity may lead to uncontrolled changes in the geological environment. This paper presents an example of structural changes in fluvial sand of the Praski terrace (in Warsaw) caused by the activity of a temporary concrete batching plant. Our investigations made it possible to identify the material responsible for the structural anomalies observed in the bottom of the trench excavation. The compound responsible for the cementation phenomenon was identified as ettringite – hydrated calcium aluminosulphate: Ca 6 Al 2 [(OH) 12 (SO 4 ) 3 ]·26H 2 O. The source of ettringite were most probably significant volumes of contaminants coming from the temporary concrete batching plant (e.g., from the rinsing of concrete mixers and/or installations for concrete storage and transportation). While penetrating into the ground, ettringite caused extensive cementation of the soil mass, mainly in the saturation zone. As a result, the mineral (chemical) composition of the inter-grain space changed and the structure of the sand was strengthened. The estimated zone of volumetric changes in soil properties was about 6 thousand m 3 . However, analysis of the chemical composition of groundwater for its potential sulphate contamination, did not reveal any anomalous concentrations of sulphates.
Ettringite是导致普拉斯基阶地河流砂结构强化的一个因素(波兰华沙)
: Zawrzykraj, P., Rydelek。, P, Bąkowska, A.和Cabalski, K. 2022。钙矾石是造成普拉斯基阶地河流砂结构强化的一个因素(波兰华沙)。地质学报,72(4),519-528。华沙。工程活动可能导致地质环境发生不可控制的变化。本文介绍了一个由临时混凝土配料厂的活动引起的普拉斯基阶地(华沙)河流砂结构变化的例子。我们的调查使我们有可能确定造成沟槽挖掘底部观察到的结构异常的物质。造成胶结现象的化合物被确定为钙矾石-水合硫酸铝钙:Ca 6 Al 2 [(OH) 12 (so4) 3]·26h2o。钙矾石的来源很可能是来自临时混凝土配料厂的大量污染物(例如,来自混凝土搅拌器的冲洗和/或混凝土储存和运输装置)。钙矾石在入土过程中,主要在饱和带引起大面积的土体胶结。其结果是改变了粒间空间的矿物(化学)组成,加强了砂土的结构。估计土壤性质的体积变化区约为6 000立方米。然而,对地下水化学成分的分析,其潜在的硫酸盐污染,没有发现任何异常的硫酸盐浓度。
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来源期刊
Acta Geologica Polonica
Acta Geologica Polonica 地学-地质学
CiteScore
1.70
自引率
18.20%
发文量
0
审稿时长
>12 weeks
期刊介绍: Acta Geologica Polonica publishes original and review papers on all aspects of basic geology, with particular focus on sedimentology, stratigraphy, palaeontology, regional geology, structural geology, and regional petrography. All papers are published in English.
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