Chinese National Institute of Cultural Property

Beijing, China

Chinese National Institute of Cultural Property

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Guo L.,HIGH-TECH | Sun Y.-Z.,Chinese National Institute of Cultural Property
Gongneng Cailiao/Journal of Functional Materials | Year: 2010

The clay loam specimens were stabilized with Perma-zyme in proper proportion. The unconfined compression strengths of specimens are higher than those without Perma-zyme at the early curing stages. To investigate the relation between micrograph and strength of the soil stabilized with Perma-zyme at the early curing stages, the micrographs of the specimens and the specimens without Perma-zyme were studied in scanning electron microscopy (SEM) at 7, 14d of age. The SEM micrographs (40μm) of the specimens and the specimens without Perma-zyme are difficult to complete the qualitative analysis from direct observation. Fractal dimension values of SEM images were computed by box-counting. Fractal dimension values of SEM images of the specimens without Perma-zyme are larger than those stabilized with Perma-zyme at 7, 14d of age. The unconfined compression strength of specimen with larger fractal dimension value is lower at the same early curing stage. When unconfined compression strength of the specimen increases, the fractal dimension value decreases as the curing age increases from 7 to 14d.


Zhang Q.,China State Construction International Co. | Li N.,Chinese National Institute of Cultural Property | Wang D.,Tianjin Tanggu Museum
Advanced Materials Research | Year: 2011

The lime-stabilized soil was mixed with glutinous rice paste in proper proportion to determine the difference in compressive strength caused by introduction of glutinous rice paste. The experimental results show that the unconfined compressive strengths of lime-stabilized soil specimens treated with glutinous rice paste are all higher than those without treated at different curing times (7d, 28d, 40d, and 60d). The calculated fractal box dimension value of SEM image of lime stabilized soil sample is close to and slightly less than the one treated with glutinous rice paste. The SEM images show that the microstructure of lime-stabilized soil treated with glutinous rice paste is denser than that without treated. This kind of denser microstructure should be the basis of higher unconfined compressive strengths of the specimens treated with glutinous rice paste. © (2011) Trans Tech Publications, Switzerland.


Peng H.-T.,China Agricultural University | Zhang Q.,China State Construction International Co. | Li N.-S.,Chinese National Institute of Cultural Property | Wang D.-F.,Tianjin Tanggu Museum
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2011

In order to investigate the effect of sticky rice paste on properties of tabia used as in situ replacement to protect ancient earthen ruins, two tabias were mixed with sticky rice paste in designated proportions. The 28 d unconfined compressive strengths of the mixture were higher than those without sticky rice paste addition. The tabia of higher strength was selected, and the permeability and color of the higher strength samples were tested to determine the difference between the tabia and sticky rice tabia. The results indicate that the color difference value between the tabia and sticky rice tabia is small, and permeability coefficient of the sticky rice tabia is reduced by 85% compared with that without sticky rice. That is, sticky rice tabia shows better permeation resistance. SEM morphology shows that the tabia sample is less dense than the sticky rice tabia.


Peng H.-T.,China Agricultural University | Zhang Q.,China State Construction International Co. | Li N.-S.,Chinese National Institute of Cultural Property | Wang D.-F.,Tianjin Tanggu Museum
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2012

Two types of compacted tabia were mixed with Perma-zyme in proper proportion. The 28 d unconfined compressive strengths of them were higher than those without Perma-zyme. The 28 d unconfined compressive strength of compacted tabia with Perma-zyme added and higher use level of lime was higher than the others. Strong base environment with high pH value can strain and even kill bacteria. It is indicated that promotion of the soil bacteria to be more activated is not the only factor for Perma-zyme as an enzymatic stabilizer to improve the compressive strength of compacted tabia. The XRD pattern of compacted tabia treated with Perma-zyme shows that there is a stronger diffraction peak than that without Perma-zyme added occurring at near 28° of abscissa. The possibility of some crystal form changes caused by Perma-zyme in tabia could not be excluded. Scanning electron microscopy revealed that the microstructure of the tabia treated with Perma-zyme became more dense. It is found based on fractal analysis that the compacted tabia with Perma-zyme added contains smaller pores and less large pores than the one without Perma-zyme added, and Perma-zyme is helpful to increase interaction between particles of the compacted tabia.


Peng H.,China Agricultural University | Zhang Q.,Tower International | Li N.,Chinese National Institute of Cultural Property | Wang D.,Museum Office
Advanced Materials Research | Year: 2011

Perma-Zyme is an enzymatic stabilizer. To test the feasibility of adding Perma-Zyme to tabia used to protect ancient earthen ruins, the 28d unconfined compression strength, permeability and color-difference were tested to determine the difference between the tabia and tabia treated with Perma-Zyme. The experimental results show that the 28d unconfined compression strengths of specimens treated with Perma-Zyme are higher than those without Perma-Zyme, and the color-difference(DE*) between the tabia and tabia mixed Perma-zyme is larger than 3(suggested color tolerance Chinese standardized GB/T 15608-2006), and the permeability coefficient of tabia mixed Perma-Zyme is smaller than that without Perma-Zyme, i.e., has better impermeability. Box dimension values of SEM images(with different scale bars) of samples were computed by box-counting method. Box dimension values of SEM images of the same sample are different on different scale bars. The analysis shows that SEM microstructure of the tabia sample treated with Perma-Zyme is finer and denser than the one without Perma-Zyme. © (2011) Trans Tech Publications.

Loading Chinese National Institute of Cultural Property collaborators
Loading Chinese National Institute of Cultural Property collaborators