Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

Gustave Semugaza; Tommy Mielke; Marianela Escobar CastilloAnne Zora GierthJoo Xian TamStefan NawrathDoru C. Lupascu

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Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

机译：Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

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Abstract Cement is the strength-forming component of concrete. It has been a major building material for more than a century. However, its production is accountable for a considerable percentage of global CO2 emissions and is very energy-intensive. The Ordinary Portland Cement (OPC) production is a thermal process at around 1450?°C. This study shows that the reactivation of Hydrated Cement Powder (HCP) can be successful at a much lower temperature. Therefore, the possibility of using HCP to replace parts of OPC in concrete reduces the energy consumption and the CO2 emissions associated with OPC production. HCP, which may ultimately stem from recycled concrete, needs treatment to produce new concrete of the required mechanical strength. Using reactivated HCP in concrete, an optimum strength is achieved by heating the HCP in the range of 400–800?°C. Among other factors, the type of cement used influences the optimum heating temperature and attainable strength. This paper shows that 600?°C is an optimum heating temperature using the OPC type CEM I 52.5R. The crystalline phase transitions resulting from the thermal treatment were analyzed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG). The heat released during hydration was investigated, and scanning electron microscopy (SEM) displays the microstructure evolution. OPC can be partially replaced by thermally treated HCP in mortar, attaining similar mechanical strength values.

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《Materials and structures》 |2023年第3期|1.1-1.16|共16页
作者
Gustave Semugaza; Tommy Mielke; Marianela Escobar CastilloAnne Zora GierthJoo Xian TamStefan NawrathDoru C. Lupascu;
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作者单位

University of Duisburg-Essen;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Hydrated cement powder; Dehydrated cement powder; Thermal treatment; Reactivation; Partial replacement of ordinary portland cement; Mechanical performance;

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

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