輕質骨材吸水性對卜作嵐混凝土界面過渡區微結構之影響

游雅婷

doi:10.6845/NCHU.2011.00988

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輕質骨材吸水性對卜作嵐混凝土界面過渡區微結構之影響

Influences of water absorbency on the microstructure of interfacial transition zone of lightweight aggregate of concrete containing pozzolanic materials

游雅婷 , Masters　　Advisor：顏聰　　

繁體中文 DOI： 10.6845/NCHU.2011.00988

界面過渡區；輕質骨材；飛灰；爐石；微結構； ITZ ； lightweight aggregate ； fly ash ； slag ； microstructure

Abstract │ Reference (38) │ Altmetrics

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The high water absorption of lightweight aggregate may change the microstructure of Interfacial Transition Zone (ITZ), and affect the bond strength of concrete. The variables considered in this research include one kind of lightweight aggregate (LWA) with particle density of 1.32g/cm3, four water contents of LWA (0%, 35%, 100%), one water to cement ratio of 0.55 and one substitute ratio (20%) of content with fly ash and slug. Standard specimens prepared with lightweight aggregate concrete mixture were adopted for the basic mechanical testing and microstructure detection, including micro-hardness test, X-ray diffraction experiment, mercury intrusion test and SEM observation.
Test results show that the LWAC made with dry LWA achieves the highest compressive strength, followed by the 35% and 70% water content of LWA, the saturated LWA is the lowest. Adding adequate amount of pozzolanic material in concrete may improve the pore structure of ITZ. The slag LWAC presents evident pozzolanic reaction at 28 days, whereas the fly-ash LWAC presents the effect until 91 days. It is also found from the MIP test that the lower the water content of LWA is, the less the total pore volume and capillary pore volume in bulk cement paste will be (D < 35% < S).The slag LWAC has the lowest total pore volume at 7 days and 28 days. From the X-Ray detection, it shows that the CH crystal contained in ITZ increases with the water content of LWA. Under the similar water content of LWA, the fly ash LWAC and slag LWAC have lower CH contents. The micros hardness test reveals that the dry LWA presents the highest hardness value in ITZ, the lower the water content of LWA, the higher the hardness value of ITZ. In addition, it is found from SEM observation that the pore in ITZ tends to be not evident when the water content of LWA decreases.
Based on the results of experiments it can be concluded that the water content of lightweight aggregate significantly affects the characteristics of ITZ; increasing the water content of LWA may lend to an disadvantageous effect on the properties of ITZ and in turn reduce the mechanical properties of LWAC.

Reference ( 38 ) 〈TOP〉

[6] E.G. Ehlers, “The mechanism of lightweight aggregate formation,” Am. Ceramic Soc. Bull.,Vol.37（2）, pp.95-99, 1958.
連結：
[7] C.C. Tsai, K.S.Wang, I.J.Chiou, “Effect of SiO2-Al2O3-flux ratio change on the bloating characteristics of lightweight aggregate material produced from recycled sewage ludge,” Journal of Hazardous Materials, Vol.134, pp.87-93, 2006.
連結：
[9] 蕭博仰，「水庫淤泥輕質骨材之膨脹氣體生成研析，」國立中興大學土木工程研究所，2006。
連結：
[10] C.M. Riley, “Relation of chemical properties to the bloating of clays,” J. Am. Ceramic Soc.,Vol.34（4）, pp.121-128, 1951.
連結：
[16] H.J. Chen，T.Yen，T.P.Lai，and Y.L. Huang，”Determination of the dividing strength and its relation to the concrete strength in lightweight aggreg cement ＆ Concrete Composites，Vol.21，pp.29-37，1999
連結：

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