Performance and Micro-structure of Fired Bricks Made of Solidified Lake Silt

ZHANG Ya-mei, JIA Lu-tao, CUI Qiang , MEI Hao, ZHANG Pei-gen, SUN Zheng-ming

Abstract

Lake silt and solidified lake silt were used as the main raw materials to prepare fired brick samples employing the vacuum plastic extrusion in a laboratory scale study. Raw material properties tests showed that the addition of a small amount of solidified agent had limited influence on the plasticity index, oxide composition and mineral composition, but had some influence on the formability. Linear drying shrinkage, water absorption, bulk density, compressive strength, thermal conductivity and freeze-thaw resistance of two kinds of brick samples were tested. The test results showed that linear drying shrinkage of solidified silt brick samples with 90% solidified silt and 10% cinder was 5.42%, water absorption was 18.2% and compressive strength was 15.8 MPa. The overall performance of the fired brick samples made of solidified silt was slightly worse than that of the fired brick samples made of lake silt. In addition, SEM and MIP were used to examine the microstructural properties of brick samples, and the results demonstrated that the micro-structure of bricks made of solidified lake silt was more loose, and the porosity was higher than those of the bricks made of lake silt at the same dosage of cinder, which play an important role in the performance of the brick samples such as compressive strength and water absorption. Meanwhile, the thermal conductivity of the former was slightly lower, and freeze-thaw resistances of the both bricks were almost similar.

 

 

Keywords: lake silt,  solidified lake silt,  fired brick,  microstructure,  strength


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References


CHEN Ping, ZHANG Zhen-ying, LI Xiao-shan, el al. Solidification technology of dredged sediment for reuse as civil engineering materials [J]. Zhejiang Hydrotechnics, 2006(6); 1—3. (In Chinese)

DING Jian-wen, ZHANG Shuai, HONG Zhen-shun, et al. Experimental study of solidification of dredged clays with high water content by adding cement and phosphogypsum synchronously[J]. Rock and Soil Mechanics, 2010,31(9): 2817 — 2822. (In Chinese)

CHENG Fu-zhou, LEI Xue-wen, MENG Qing-shan, el al. Experimental study on cement and its additional agent to cure silt [J]. Building Science, 2014,30(9):51 — 55. (In Chinese)

ZHU Guang-wei, CHEN Ying-xu, WANG Feng-ping, et al. Application of sediment dredged in grand canal on agriculture ( Hangzhou Section) [J]. Agro-environmental Protection, 2001, 20 (2): 101 — 103. (In Chinese)

FAN Zhi-ming, ZHANG Hu-yuan, Wang Bao, et al. Horticultural application of dredged sediment [J]. Journal of Anhui Agricultural Sciences, 2009,37(3): 1089—1091. (In Chinese)

XIAO Bing, LUO Hai-bing, ZHOU Li. Application of mud curing technology in soft soil subgrade treatment of urban road[J]. Foundation & Structure Engineering,2012,30(5): 128—131. (In Chinese)

ZHANG Chun-lei, ZHU Wei, LI Lei, et al. Field test of dike construction with solidified lake dredged material[J]. China Harbour Engineering, 2007(1):27 — 29. (In Chinese)

YANG Xiao-hua, YANG Bo, CUI Qing-quan, et al. Preparation of ceramic with river silt, shale, and bio-sludge [J]. New Building Materials, 2010,37(11); 54 — 56. (In Chinese)

XI Ben-feng, LI Hong-nian, ZHANG Ya-mei» elal. Study on sintered perforated brick using lake silt [J]. New Building Materials, 2007, 34(11): 20-22. (In Chinese)

DALTON J L, GARDNER К H, SEAGER T P, et al. Properties of Portland cement made from contaminated sediments[J]. Resources, Conservation and Recycling, 2004, 41(3): 227 — 241.

WU Dong-qing, DONG Zhi-liang, XU Wen-yu. Application of chemical-physical combined method to land reclamation using seabed marine clay [J]. Chinese Journal of Rock Mechanics and Engineering, 2015,32(9): 1779-1784. (In Chinese)

JI Bing, XIAO Xu-mu, LI Zhong. Dredged mud solidification disposal techniques and resource [J]. Safety and Environmental Engineering, 2010, 17(2); 54 — 56. (In Chinese)


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