Rheological Characteristics of Ultra-High Performance Concrete and Its Regulation

Abstract

Abstract: In order to achieve the efficient regulation of the rheological properties of ultra-high performance concrete (UHPC), bentonite was used as an auxiliary cementing material and the performances of the prepared UHPC were evaluated. The fluidity, static yield stress, dynamic yield stress, plastic viscosity and thixotropy of UHPC slurry were studied, and the effect of different bentonite content on the rheological properties of UHPC slurry was systematically analyzed. The results show that: the overall fluidity of UHPC slurry shows a downward trend, and the decline amplitude gradually increases with the increase of bentonite content. When the content of bentonite increases from 0% to 15.0% (mass fraction), the static yield stress, dynamic yield stress and plastic viscosity of UHPC slurry increase significantly, by about 17.05 times, 5.78 times and 1.16 times, respectively. The hysteresis loop area and thixotropy index increase with the increase of bentonite content, and the thixotropy is significantly improved. Meanwhile, UHPC with bentonite still meets the advanced mechanical properties of UHPC.

Key words: ultra-high performance concrete, bentonite, rheological property, yield stress, plastic viscosity, thixotropy, compressive strength

CLC Number:

TU528

LI Keke, LI Long, HE Youlin, RU Junhui, YU Rui, XU Liuliu, FAN Dingqiang, WANG Zhiyu. Rheological Characteristics of Ultra-High Performance Concrete and Its Regulation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1570-1577.

References

[1] 徐翔波,于泳,金祖权,等.养护制度对超高性能混凝土微观结构和力学性能影响的研究综述[J].硅酸盐通报,2021,40(9):2856-2870.
XU X B, YU Y, JIN Z Q, et al. Review on effects of microstructure and mechanical properties of ultra-high performance concrete by curing regimes[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(9): 2856-2870 (in Chinese).
[2] YU R, SPIESZ P, BROUWERS H J H. Mix design and properties assessment of ultra-high performance fibre reinforced concrete (UHPFRC)[J]. Cement and Concrete Research, 2014, 56: 29-39.
[3] 钟蕴为,吴永魁,文许高媛,等.超高性能混凝土(UHPC)基本性能研究综述[J].混凝土与水泥制品,2021(9):1-4.
ZHONG Y W, WU Y K, WEN X G Y, et al. Summary of research on basic performance of ultra-high performance concrete[J]. China Concrete and Cement Products, 2021(9): 1-4 (in Chinese).
[4] 张云升,张文华,陈振宇.综论超高性能混凝土:设计制备·微观结构·力学与耐久性·工程应用[J].材料导报,2017,31(23):1-16.
ZHANG Y S, ZHANG W H, CHEN Z Y. A complete review of ultra-high performance concrete: design and preparation, microstructure, mechanics and durability, engineering applications[J]. Materials Review, 2017, 31(23): 1-16 (in Chinese).
[5] AHMED T, ELCHALAKANI M, BASARIR H, et al. Development of ECO-UHPC utilizing gold mine tailings as quartz sand alternative[J]. Cleaner Engineering and Technology, 2021, 4: 100176.
[6] CHEN Q, MA R, LI H X, et al. Effect of chloride attack on the bonded concrete system repaired by UHPC[J]. Construction and Building Materials, 2021, 272: 121971.
[7] LI P P, YU Q L, BROUWERS H J H. Effect of PCE-type superplasticizer on early-age behaviour of ultra-high performance concrete (UHPC)[J]. Construction and Building Materials, 2017, 153: 740-750.
[8] DING M X, YU R, FENG Y, et al. Possibility and advantages of producing an ultra-high performance concrete (UHPC) with ultra-low cement content[J]. Construction and Building Materials, 2021, 273: 122023.
[9] 黄伟,孙伟.石灰石粉掺量对超高性能混凝土水化演变的影响[J].东南大学学报(自然科学版),2017,47(4):751-759.
HUANG W, SUN W. Effects of limestone addition on hydration development of ultra-high performance concrete[J]. Journal of Southeast University (Natural Science Edition), 2017, 47(4): 751-759 (in Chinese).
[10] VANCE K, KUMAR A, SANT G, et al. The rheological properties of ternary binders containing Portland cement, limestone, and metakaolin or fly ash[J]. Cement and Concrete Research, 2013, 52: 196-207.
[11] 白刚,王里,王芳,等.3D打印UHPC的制备和力学性能试验研究[J].材料导报,2021,35(12):12063-12069.
BAI G, WANG L, WANG F, et al. Investigation of the printability and mechanical properties of 3D printing UHPC[J]. Materials Reports, 2021, 35(12): 12063-12069 (in Chinese).
[12] CAI Y X, LIU Q F, YU L W, et al. An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration[J]. Cement and Concrete Composites, 2021, 122: 104153.
[13] WANG R, GAO X J, ZHANG J Y, et al. Spatial distribution of steel fibers and air bubbles in UHPC cylinder determined by X-ray CT method[J]. Construction and Building Materials, 2018, 160: 39-47.
[14] WANG R, GAO X J, HUANG H H, et al. Influence of rheological properties of cement mortar on steel fiber distribution in UHPC[J]. Construction and Building Materials, 2017, 144: 65-73.
[15] LOWKE D, VANDENBERG A, PIERRE A, et al. Injection 3D concrete printing in a carrier liquid-underlying physics and applications to lightweight space frame structures[J]. Cement and Concrete Composites, 2021, 124: 104169.
[16] ROUSSEL N. A theoretical frame to study stability of fresh concrete[J]. Materials and Structures, 2007, 39(1): 81-91.
[17] QIAN Y, LESAGE K, EL CHEIKH K, et al. Effect of polycarboxylate ether superplasticizer (PCE) on dynamic yield stress, thixotropy and flocculation state of fresh cement pastes in consideration of the critical micelle concentration (CMC)[J]. Cement and Concrete Research, 2018, 107: 75-84.
[18] QIAN Y, MA S W, KAWASHIMA S, et al. Rheological characterization of the viscoelastic solid-like properties of fresh cement pastes with nanoclay addition[J]. Theoretical and Applied Fracture Mechanics, 2019, 103: 102262.
[19] XIE Y, LI J, LU Z Y, et al. Effects of bentonite slurry on air-void structure and properties of foamed concrete[J]. Construction and Building Materials, 2018, 179: 207-219.
[20] 胡倩文.粘土对聚羧酸减水剂的分散性能影响研究[D].重庆:重庆大学,2013.
HU Q W. Effects of microfines on the dispersibility of polycarboxylate superplasticizer[D]. Chongqing: Chongqing University, 2013 (in Chinese).
[21] 王浩,关淑君,朱爱凤,等.钠基蒙脱土对新拌水泥流动性劣化机理研究[J].中国建材,2016,65(5):130-133.
WANG H, GUAN S J, ZHU A F, et al. Study on fluidity degradation mechanism of sodium-based montmorillonite on fresh cement[J]. China Building Materials, 2016, 65(5): 130-133 (in Chinese).
[22] 王子明,吴昊,徐莹,等.黏土对聚羧酸减水剂应用性能的抑制机理[J].建筑材料学报,2014,17(2):234-238+279.
WANG Z M, WU H, XU Y, et al. Inhibition mechanism of clays on applying performances of polycarboxylate superplasticizer[J]. Journal of Building Materials, 2014, 17(2): 234-238+279 (in Chinese).
[23] LEI L, PLANK J. A concept for a polycarboxylate superplasticizer possessing enhanced clay tolerance[J]. Cement and Concrete Research, 2012, 42(10): 1299-1306.
[24] CHEN G, LEI J H, DU Y, et al. A polycarboxylate as a superplasticizer for montmorillonite clay in cement: adsorption and tolerance studies[J]. Arabian Journal of Chemistry, 2018, 11(6): 747-755.
[25] XIE Y, LI J, LU Z Y, et al. Preparation and properties of ultra-lightweight EPS concrete based on pre-saturated bentonite[J]. Construction and Building Materials, 2019, 195: 505-514.