Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Research on cement hydration and hardening with different alkanolamines
HighlightsSix different alkanolamines were added separately into Portland cement as chemical additives, and their effects on cement hardening and hydration were investigated for the first time.The formation of the TEA-Ca2+ complex inhibited the growth of CH, thus delaying the hydration of alite and reducing the rate of growth in strength during the late period.DEIPA and EDIPA promote the hydration of the aluminum and ferrite phases as well as catalyze the conversion of AFt to AFm, which leads to an optimized pore size distribution.THEED and THPED improve the degree of hydration over the entire hydration process and have larger suitable dosage ranges than DEIPA and EDIPA.
AbstractIn this work, six types of alkanolamines (i.e., TEA, TIPA, DEIPA, EDIPA, THEED and THPED) were added into Portland cement as chemical additives, and their effects on physical properties and hydration of Portland cement as well as mechanism were investigated. The results show that all the alkanolamines expect TEA can effectively improve the degree of cement hydration. TEA delays the hydration of alite because the formation of the TEA-Ca2+ complex inhibits the growth of CH. TIPA accelerates the hydration of C4AF at late stage, but reduce the early strength due to its air-entraining effect. The lower dosages of DEIPA and EDIPA have the advantages of TEA and TIPA, which increase not only the early strength but also the late strength. They promote both the hydration of the aluminum and ferrite phase as well as catalyze the conversion of AFt to AFm, which lead to the optimization of pore size distribution. The effects of THEED and THPED on hydration of Portland cement are similar though their molecular structure are different which improve the late strength and have larger suitable dosage range.
Research on cement hydration and hardening with different alkanolamines
HighlightsSix different alkanolamines were added separately into Portland cement as chemical additives, and their effects on cement hardening and hydration were investigated for the first time.The formation of the TEA-Ca2+ complex inhibited the growth of CH, thus delaying the hydration of alite and reducing the rate of growth in strength during the late period.DEIPA and EDIPA promote the hydration of the aluminum and ferrite phases as well as catalyze the conversion of AFt to AFm, which leads to an optimized pore size distribution.THEED and THPED improve the degree of hydration over the entire hydration process and have larger suitable dosage ranges than DEIPA and EDIPA.
AbstractIn this work, six types of alkanolamines (i.e., TEA, TIPA, DEIPA, EDIPA, THEED and THPED) were added into Portland cement as chemical additives, and their effects on physical properties and hydration of Portland cement as well as mechanism were investigated. The results show that all the alkanolamines expect TEA can effectively improve the degree of cement hydration. TEA delays the hydration of alite because the formation of the TEA-Ca2+ complex inhibits the growth of CH. TIPA accelerates the hydration of C4AF at late stage, but reduce the early strength due to its air-entraining effect. The lower dosages of DEIPA and EDIPA have the advantages of TEA and TIPA, which increase not only the early strength but also the late strength. They promote both the hydration of the aluminum and ferrite phase as well as catalyze the conversion of AFt to AFm, which lead to the optimization of pore size distribution. The effects of THEED and THPED on hydration of Portland cement are similar though their molecular structure are different which improve the late strength and have larger suitable dosage range.
Research on cement hydration and hardening with different alkanolamines
Xu, Zhiqiang (Autor:in) / Li, Weifeng (Autor:in) / Sun, Jinfeng (Autor:in) / Hu, Yueyang (Autor:in) / Xu, Kai (Autor:in) / Ma, Suhua (Autor:in) / Shen, Xiaodong (Autor:in)
Construction and Building Materials ; 141 ; 296-306
01.03.2017
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Research on cement hydration and hardening with different alkanolamines
| British Library Online Contents | 2017
Research on cement hydration and hardening with different alkanolamines
| Online Contents | 2017
Research on cement hydration and hardening with different alkanolamines
| British Library Online Contents | 2017
Research on cement hydration and hardening with different alkanolamines
| British Library Online Contents | 2017
Research on cement hydration and hardening with different alkanolamines
| British Library Online Contents | 2017