Influence of PVA Fiber Type on Mechanical Properties of Strain-Hardening Geopolymer Composites

Abstract

Abstract: The toughening effects of four types of polyvinyl alcohol (PVA) fibers in geopolymer matrices with different mix proportions were investigated, which can provide experimental data for the preparation of strain-hardening geopolymer composites (SHGC) reinforced with domestic PVA fibers without surface oil coating. The focus was on the influences of the ratio of slag to fly ash, concentration of alkaline solution, dimensions and surface properties of fibers and the like on the compressive and direct tensile properties of SHGC. The compressive testing results show that the matrices and composites containing slag have a compressive strength more than 30 MPa, and those with plain fly ash ranging from 12 MPa to 15 MPa. The direct tensile testing results show that the ductility of SHGC with oil-coated PVA fibers is generally higher than that of SHGC with non-oil-coated PVA fiber. However, the toughening effect of domestic PVA fibers can be enhanced by tailoring the mix proportion of matrices. For the case where the dosage of fly ash is 33% (by mass), SHGC reinforced with non-oil-coated PVA fibers displays a value in ultimate strain up to 1.44%, comparable with that of SHGC with oil-coated PVA fibers. For the case of plain fly ash, geopolymer composites reinforced with any one of the four types of PVA fibers exhibit stable multiple cracking and strain-hardening behavior.

Key words: PVA fiber, strain-hardening geopolymer composite, direct tensile test, fly ash, slag, mechanical property

CLC Number:

TB332

ZHU Hongkang, LIN Chang, CAI Shu, XU Shuying, PAN Lisha. Influence of PVA Fiber Type on Mechanical Properties of Strain-Hardening Geopolymer Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3693-3701.

References

[1] DAVIDOVITS J. Geopolymers and geopolymeric materials[J]. Journal of Thermal Analysis, 1989, 35(2): 429-441.
[2] 史才军,何富强,FERNANDEZ-JIMENEZ A,等.碱激发水泥的类型与特点(英文)[J].硅酸盐学报,2012,40(1):69-75.
SHI C J, HE F Q, FERNANDEZ-JIMENEZ A, et al. Types and characteristics of alkali-activated cement[J].Bulletin of the Chinese Ceramic Society, 2012, 40(1): 69-75.
[3] 曹向阳,杨建森.地聚合物及其混凝土的胶凝性质概述[J].硅酸盐通报,2019,38(7):2095-2103.
CAO X Y, YANG J S. Overview of cementing properties of geopolymer and geopolymer concrete[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(7): 2095-2103 (in Chinese).
[4] 张大旺,王栋民.地质聚合物混凝土研究现状[J].材料导报,2018,32(9):1519-1527+1540.
ZHANG D W, WANG D M. Research status of geopolymer concrete[J]. Materials Review, 2018, 32(9): 1519-1527+1540 (in Chinese).
[5] RANJBAR N, ZHANG M Z. Fiber-reinforced geopolymer composites: a review[J]. Cement and Concrete Composites, 2020, 107: 103498.
[6] FARHAN K Z, JOHARI M A M, DEMIRBOA R. Impact of fiber reinforcements on properties of geopolymer composites: a review[J]. Journal of Building Engineering, 2021, 44: 102628.
[7] LYU B C, DING C, GUO L P, et al. Basic performances and potential research problems of strain hardening geopolymer composites: a critical review[J]. Construction and Building Materials, 2021, 287: 123030.
[8] WANG Y, WANG Y S, ZHANG M Z. Effect of sand content on engineering properties of fly ash-slag based strain hardening geopolymer composites[J]. Journal of Building Engineering, 2021, 34: 101951.
[9] ZHANG S Z, LI V C, YE G. Micromechanics-guided development of a slag/fly ash-based strain-hardening geopolymer composite[J]. Cement and Concrete Composites, 2020, 109: 103510.
[10] KAN L L, LV J W, DUAN B B, et al. Self-healing of engineered geopolymer composites prepared by fly ash and metakaolin[J]. Cement and Concrete Research, 2019, 125: 105895.
[11] OHNO M, LI V C. A feasibility study of strain hardening fiber reinforced fly ash-based geopolymer composites[J]. Construction and Building Materials, 2014, 57: 163-168.
[12] NEMATOLLAHI B, SANJAYAN J, SHAIKH F U A. Matrix design of strain hardening fiber reinforced engineered geopolymer composite[J]. Composites Part B: Engineering, 2016, 89: 253-265.
[13] 阚黎黎,王文松,王家豪,等.高延性偏高岭土-粉煤灰基地聚合物的制备及拉伸性能[J].建筑材料学报,2019,22(5):673-679+699.
KAN L L, WANG W S, WANG J H, et al. Preparation and tensile property of metakaolin-fly ash based engineered geopolymer composites[J]. Journal of Building Materials, 2019, 22(5): 673-679+699 (in Chinese).
[14] 郭晓潞,熊归砚.超高韧性粉煤灰基地聚合物的研制及性能[J].建筑材料学报,2019,22(6):949-956.
GUO X L, XIONG G Y. Preparation and performance of ultra-high toughness fly ash based geopolymer[J]. Journal of Building Materials, 2019, 22(6): 949-956 (in Chinese).
[15] LI V C, WANG S X, WU C. Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite (PVA-ECC)[J]. ACI Materials Journal, 2001, 98(6): 483-492.
[16] LI V C, WU C, WANG S X, et al. Interface tailoring for strain-hardening polyvinyl alcohol-engineered cementitious composite (PVA-ECC)[J]. ACI Materials Journal, 2002, 99(5): 463-472.
[17] ZHANG Z G, ZHANG Q. Matrix tailoring of engineered cementitious composites (ECC) with non-oil-coated, low tensile strength PVA fiber[J]. Construction and Building Materials, 2018, 161: 420-431.
[18] 张亚男,臧栋,林常,等.无表面修饰PVA纤维增强高韧应变硬化水泥基复合材料的性能研究[J].硅酸盐通报,2020,39(9):2745-2753.
ZHANG Y N, ZANG D, LIN C, et al. Properties of high-toughness strain-hardening cementitious composites reinforced by PVA fiber without surface modification[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(9): 2745-2753 (in Chinese).
[19] ZHAO J H, TONG L Y, LI B E, et al. Eco-friendly geopolymer materials: a review of performance improvement, potential application and sustainability assessment[J]. Journal of Cleaner Production, 2021, 307: 127085.
[20] REN B, ZHAO Y L, BAI H Y, et al. Eco-friendly geopolymer prepared from solid wastes: a critical review[J]. Chemosphere, 2021, 267: 128900.
[21] ZHOU J, QIAN S Z, SIERRA BELTRAN M G, et al. Development of engineered cementitious composites with limestone powder and blast furnace slag[J]. Materials and Structures, 2010, 43(6): 803-814.