Flexural Performance and Early Desiccation Cracking Behavior of Cemented Soil Reinforced by Jute and PVA Fibers

Abstract

Abstract: Deep cemented soil mixing retaining wall has the characteristics of cement-based materials, including brittle failure, low tensile strength and flexural strength. The drying shrinkage due to temperature stress may lead to desiccation cracks, which may result in leakage and collapse. In this paper, the flexural performance and post-cracking performance of jute fiber and polyvinyl alcohol (PVA) fiber reinforced cemented soil were studied, as well as the effects of fibers on reducing desiccation cracks of cemented soil at early stage. The results show that with the increase of fiber content, the first crack flexural strength and peak flexural strength increase. In addition, the fiber has good results in improving the post-cracking performance of cemented soil. The residual flexural strength ratio, ductility index and toughness increase significantly with the increase of fiber content. The jute fiber is slightly better than PVA fiber in toughness, it is observed tiny difference between the two types of fibers with regard to other post-cracking index. Moreover, the digital image correlation method was used to study the effects of fibers on the early desiccation shrinkage cracks of cemented soil. The results indicate that the fiber significantly restrains the formation and propagation of desiccation cracks under dry conditions, reduces the width and quantity of cracks, and the effect is positively related to the fiber content.

Key words: jute fiber, PVA fiber, cemented soil, residual flexural strength ratio, ductility index, toughness, desiccation crack

CLC Number:

TU43

YAO Xin, XU Yaxing, DONG Xiaoqiang. Flexural Performance and Early Desiccation Cracking Behavior of Cemented Soil Reinforced by Jute and PVA Fibers[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 2921-2929.

References

[1] JUANG C H, DIJKSTRA T, WASOWSKI J, et al. Loess geohazards research in China: advances and challenges for mega engineering projects[J]. Engineering Geology, 2019, 251: 1-10.
[2] KHATTAK M J, ALRASHIDI M. Durability and mechanistic characteristics of fiber reinforced soil-cement mixtures[J]. International Journal of Pavement Engineering, 2006, 7(1): 53-62.
[3] SHAIKH F U A. Review of mechanical properties of short fibre reinforced geopolymer composites[J]. Construction and Building Materials, 2013, 43: 37-49.
[4] HEJAZI S M, SHEIKHZADEH M, ABTAHI S M, et al. A simple review of soil reinforcement by using natural and synthetic fibers[J]. Construction and Building Materials, 2012, 30: 100-116.
[5] 唐朝生,施斌,蔡奕,等.聚丙烯纤维加固软土的试验研究[J].岩土力学,2007,28(9):1796-1800.
TANG C S, SHI B, CAI Y, et al. Experimental study on polypropylene fiber improving soft soils[J]. Rock and Soil Mechanics, 2007, 28(9): 1796-1800 (in Chinese).
[6] 唐朝生,顾凯.聚丙烯纤维和水泥加固软土的强度特性[J].土木工程学报,2011,44(s2):5-8.
TANG C S, GU K. Strength behaviour of polypropylene fiber reinforced cement stabilized soft soil[J]. China Civil Engineering Journal, 2011, 44(s2): 5-8 (in Chinese).
[7] CONSOLI N C, PRIETTO P D M, ULBRICH L A. Influence of fiber and cement addition on behavior of sandy soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124(12): 1211-1214.
[8] 鹿群,郭少龙,王闵闵,等.纤维水泥土力学性能的试验研究[J].岩土力学,2016,37(s2):421-426.
LU Q, GUO S L, WANG M M, et al. Experimental study of mechanical properties of fiber cement soil[J]. Rock and Soil Mechanics, 2016, 37(s2): 421-426 (in Chinese).
[9] 牛雷,徐丽娜,郑俊杰.纤维对水泥土加固效果影响的试验研究[J].土木与环境工程学报(中英文),2021,43(2):35-40.
NIU L, XU L N, ZHENG J J. Experimental study on the reinforcement effect of fiber on cemented soil[J]. Journal of Civil and Environmental Engineering, 2021, 43(2): 35-40 (in Chinese).
[10] 张雷,张振,曹吉庆,等.聚丙烯纤维对水泥土力学性能的影响[J].地下空间与工程学报,2005,1(s1):1129-1131+1138
ZHANG L, ZHANG Z, CAO J Q, et al. Effects of polypropylene fibers on the compressive strength and elastic modules of soil-cement mixtures[J]. Chinese Journal of Underground Space and Engineering, 2005, 1(s1): 1129-1131+1138 (in Chinese)
[11] CORREIA A A S, VENDA OLIVEIRA P J, CUSTÓDIO D G. Effect of polypropylene fibres on the compressive and tensile strength of a soft soil, artificially stabilised with binders[J]. Geotextiles and Geomembranes, 2015, 43(2): 97-106.
[12] TRAN K Q, SATOMI T, TAKAHASHI H. Tensile behaviors of natural fiber and cement reinforced soil subjected to direct tensile test[J]. Journal of Building Engineering, 2019, 24: 100748.
[13] ANGGRAINI V, ASADI A, SYAMSIR A, et al. Three point bending flexural strength of cement treated tropical marine soil reinforced by lime treated natural fiber[J]. Measurement, 2017, 111: 158-166.
[14] JAMSAWANG P, SUANSOMJEEN T, SUKONTASUKKUL P, et al. Comparative flexural performance of compacted cement-fiber-sand[J]. Geotextiles and Geomembranes, 2018, 46(4): 414-425.
[15] SUKONTASUKKUL P, JAMSAWANG P. Use of steel and polypropylene fibers to improve flexural performance of deep soil-cement column[J]. Construction and Building Materials, 2012, 29: 201-205.
[16] NAHLAWI H, KODIKARA J K. Laboratory experiments on desiccation cracking of thin soil layers[J]. Geotechnical & Geological Engineering, 2006, 24(6): 1641-1664.