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The necessity of recovering soluble phosphorus from sewage sludge ashes before use in concrete based on concrete setting and workability

机译:根据混凝土设置和可加工性,在混凝土使用前从污水污泥中回收可溶性磷的必要性

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摘要

By replacing cement with alternative ashes, such as sewage sludge ashes (SSA) from mono-incineration plants, it is possible to reduce the CO-emmision from the production of cement. SSA contains a large amount of phosphate which can be extracted before addition in concrete. The Danish Standard DS/EN 450-1 states an upper limit for total phosphorus in concrete, but it does not account for the solubility. The aim of this study is to determine an upper limit for soluble phosphorus in concrete, thus minimize the formation of calcium phosphate to an acceptable level. The analysis will be based on the setting and workability. When adding soluble phosphorus salts to a mortar the setting process is extended with no pronounced difference between different soluble phosphorus salts. It is therefore assumed, that the soluble phosphorus (SP) influences the concrete setting. A logarithmic relationship between the increased addition of SP and the initial setting time is seen. By comparison with the limit for initial setting time established in DS/EN 450-1 it is possible to establish a limit for SP of 0.54 wt% cement. When studying the workability an objective limit for SP of 0.16 wt% cement can be established. SSA from the Danish mono-incineration plant at Spildevandscenter Avedøre is examined. At a pH-value of 13 it is possible to replace 55% and 16% of the cement, based on the set limits, with SSA from Spildevandscenter Avedøre, before it is necessary to extract SP from SSA before adding to the concrete mixture. Former studies have shown a replacement of up to 20% of the cement with SSA is feasible regarding compressive strength, and therefore it is necessary to consider the limit for SP of 0.16% wt% cement.
机译:通过用其他灰烬替代水泥,例如来自单焚化厂的污水污泥灰烬(SSA),可以减少水泥生产中的CO排放量。 SSA含有大量磷酸盐,可以在添加到混凝土中之前进行提取。丹麦标准DS / EN 450-1规定了混凝土中总磷的上限,但没有考虑溶解度。这项研究的目的是确定混凝土中可溶性磷的上限,从而将磷酸钙的形成降至最低水平。分析将基于设置和可操作性。当向砂浆中添加可溶性磷盐时,凝固过程会扩展,而不同可溶性磷盐之间不会出现明显差异。因此,假定可溶性磷(SP)会影响混凝土的凝结。可以看到SP的增加与初始凝固时间之间的对数关系。通过与DS / EN 450-1中设定的初始凝固时间极限进行比较,可以确定水泥的SP极限为0.54 wt%。在研究可加工性时,可以确定水泥的SP的目标极限为0.16 wt%。对来自丹麦SpildevandscenterAvedøre单一焚化厂的SSA进行了检查。在pH值为13的情况下,可以根据设定的限值,用SpildevandscenterAvedøre的SSA替代55%和16%的水泥,然后才需要在添加到混凝土混合物中之前从SSA提取SP。以前的研究表明,就抗压强度而言,用SSA代替20%的水泥是可行的,因此有必要考虑0.16%wt%水泥的SP极限。

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