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| Research on the synthesis and physical-mechanical properties of hydraulic lime prepared from loess-doll |
| YANG Jianlin1，SONG Wenwei 1，WANG Laigui2，ZHANG Yan1，ZHANG Yuao1，SUN Jiayang1 |
(1. College of Materials Science and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China；2. College of Mechanics and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China)
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Abstract The synthesis mechanism and physical-mechanical properties of hydraulic limes prepared from loess- doll were researched in this paper. The compositions of loess-dolls before and after calcination were investigated by means of X-ray fluorescence spectrometer and X-ray diffract meter. The physical-mechanical properties of mortar specimens were studied by using a deformation field inspection system with white light DSCM (Digital Speckle Correlation Method). The microscopic morphology of the specimens at different ages was characterized by scanning electron microscopy. The results show that the main ingredients of loess-dolls are CaO，2CaO•SiO2 and 2CaO•Al2O3•SiO2 after calcination of 8 hours at 900 ℃，which are similar to that of European hydraulic lime NHL5. The contents of CaCO3 and 1.5CaO•SiO2•xH2O(C-S-H) increase gradually during the curing process，but the content of Ca(OH)2 decreases gradually，and the content of 2CaO•Al2O3•SiO2 remains constant. At the early age of 1 to 5 days，the shrinkage rate increases linearly with the age. At the middle age of 6 to 17 days，the shrinkage rate increases slowly with the age. At the later age of 18 to 28 days，the shrinkage rate remains constant. The tensile and compressive strengths of hydraulic limes increase with the age，and the mechanical strengths of the samples meet the standard of NHL5. The area of deformation zone increases with the tensile stress at early stage of loading, the localization band occurs as the adjacent deformation zones merge，and the macro-cracks form and cause the sample to fail. A network structure is formed by the connection of C-S-H and CaCO3 in samples with the increasing of age，which enhances the mechanical strengths of samples.
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2018, Vol. 37 
