Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pozzolanic activity of mechanochemically and thermally activated coal-series kaolin in cement-based materials
Highlights The coal-series kaolin are treated with mechanochemically and thermally activated. The pozzolanic reactivity of thermoactivated coal-series kaolin are evaluated. Finer thermoactivated coal-series kaolin particles have high pozzolanic activity and consume more CH. The influences of thermoactivated coal-series kaolin on the properties of cement paste and mortar are studied. Thermoactivated coal-series kaolin are a promising alternative to be used as SCM.
Abstract The shortage of good quality supplementary cementitious materials (SCMs) for producing cement concrete eagerly demands an alternative pozzolan material. Thanks to the rich silica-alumina contents and large reserves in China, coal-series kaolin (CK) (a by-product of coal mining) is promising to be used as an effective SCMs in cement-based materials. This study investigated the effectiveness of using thermally activated CK coupled with mechanical grinding in ordinary Portland cement paste and mortar. The mineralogy, physicochemical structures, thermal decomposition, pozzolanic reactivity of this novel treated CK were evaluated and compared with two water-washed high-purity kaolinitic clays. The results showed that the large change of Al coordination environment in the thermally activated CK at a relatively low temperature (650 °C) rendered a high pozzolanic reactivity. The high content of kaolinite and reduced particle size by mechanical treatment were beneficial to enhancing the reactivity of thermally activated CK. With the use of thermoactivated CK, the early hydration of cement paste was significantly accelerated. The high degree of dihydroxylation, large specific surface area and high pozzolanic reaction of thermoactivated CK contributed to refining the pore structure and improving the compressive strength of blended mortar. The results of this study provided an implication of using treated CK as an alternative SCMs.
Pozzolanic activity of mechanochemically and thermally activated coal-series kaolin in cement-based materials
Highlights The coal-series kaolin are treated with mechanochemically and thermally activated. The pozzolanic reactivity of thermoactivated coal-series kaolin are evaluated. Finer thermoactivated coal-series kaolin particles have high pozzolanic activity and consume more CH. The influences of thermoactivated coal-series kaolin on the properties of cement paste and mortar are studied. Thermoactivated coal-series kaolin are a promising alternative to be used as SCM.
Abstract The shortage of good quality supplementary cementitious materials (SCMs) for producing cement concrete eagerly demands an alternative pozzolan material. Thanks to the rich silica-alumina contents and large reserves in China, coal-series kaolin (CK) (a by-product of coal mining) is promising to be used as an effective SCMs in cement-based materials. This study investigated the effectiveness of using thermally activated CK coupled with mechanical grinding in ordinary Portland cement paste and mortar. The mineralogy, physicochemical structures, thermal decomposition, pozzolanic reactivity of this novel treated CK were evaluated and compared with two water-washed high-purity kaolinitic clays. The results showed that the large change of Al coordination environment in the thermally activated CK at a relatively low temperature (650 °C) rendered a high pozzolanic reactivity. The high content of kaolinite and reduced particle size by mechanical treatment were beneficial to enhancing the reactivity of thermally activated CK. With the use of thermoactivated CK, the early hydration of cement paste was significantly accelerated. The high degree of dihydroxylation, large specific surface area and high pozzolanic reaction of thermoactivated CK contributed to refining the pore structure and improving the compressive strength of blended mortar. The results of this study provided an implication of using treated CK as an alternative SCMs.
Pozzolanic activity of mechanochemically and thermally activated coal-series kaolin in cement-based materials
Cheng, Shukai (Autor:in) / Ge, Keyu (Autor:in) / Sun, Tao (Autor:in) / Shui, Zhonghe (Autor:in) / Chen, Xuyong (Autor:in) / Lu, Jian-Xin (Autor:in)
11.06.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Pozzolanic activity of mechanochemically and thermally activated kaolins in cement
| British Library Online Contents | 2015
Pozzolanic activity of mechanochemically and thermally activated kaolins in cement
| Online Contents | 2015
Pozzolanic activity of mechanochemically and thermally activated kaolins in cement
| British Library Online Contents | 2015