Recycle option for metallurgical sludge waste as a partial replacement for natural sand in mortars containing CSA cement to save the environment and natural resources

JOURNAL OF HAZARDOUS MATERIALS

卷:398

Article

Mohamed, Alwaeli¹  Jacek, Golaszewski²  Marian, Niesler³  Jan, Pizon²  Malgorzata, Golaszewska² 

[1] Silesian Tech Univ, Fac Energy & Environm Engn, Konarskiego 18 Str, PL-44100 Gliwice, Poland

[2] Silesian Tech Univ, Aculty Civil Engn, Akad 5 Str, PL-44100 Gliwice, Poland

[3] Stanislaw Staszic Inst Ferrous Met, Karola Miarki 12-14 Str, PL-44100 Gliwice, Poland

关键词: Metallurgical sludge waste;    Mortar properties;    Sand replacement;    Cement properties;    Calcium sulphoaluminate cement (CSA);   

DOI  :  10.1016/j.jhazmat.2020.123101

来源: Elsevier

【 摘 要 】

The utilization of metallurgical sludge waste as a 10-30 % replacement of natural sand has been investigated in this paper for its effect on the initial setting time and hydration heat evolution of cement and the mechanical properties of mortars. The results revealed that the addition of metallurgical sludge waste increased the water demand by up to 30 %, delayed the initial setting time by 3 h for 10 %, to over 25 h for 30 % sand replacement, decreased the hydration heat evolution rate by 30 % for 30 % sand replacement, and negatively affected the mortars' mechanical properties from 5 to 40 % for 20 % sand replacement, and from 30 to 50 % for 30 % sand replacement. For 10 % of sand replacement compressive strength was similar to the reference mortar. In order to obtain a shorter initial setting time, decrease the shrinkage and accelerate hydration heat evolution, part of the Portland cement (CEM I) was replaced by calcium sulphoaluminate cement (CSA). It was found that this method was effective for 20-30 % of CEM I replacement by 10 % of CSA and 10-30 % of CEM I replacement by 20-30 % of CSA in the case of setting acceleration, and for 10 % replacement in case of hydration heat evolution.

【 授权许可】

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