Effect of Zeolite on Properties of Seawater Mixing Ultra-High Performance Concrete (UHPC)

Abstract

Abstract: Zeolite was utilized to partially or completely (0%, 50%, 100%, volume fraction) replace river sand and the effect of zeolite on the macro and micro properties of seawater mixing ultra-high performance concrete (UHPC) was studied. The flowability, setting time, autogenous shrinkage and compressive strength of UHPC were tested. Besides, the water absorption and water releasing of zeolite as well as the interfacial transition zone (ITZ) of UHPC were studied by low field NMR and nano-indentation. The results reveal that seawater mixing enhances the hydration of UHPC, so it shortens the setting time, increases the compressive strength and the autogenous shrinkage of UHPC. However, zeolite absorbs chloride ions, which inhibits the accelerated hydration induced by chloride ions, extends the setting time of UHPC and reduces the compressive strength. In addition, the internal curing effect of zeolite effectively improves the autogenous shrinkage of seawater mixing UHPC, and its optimization effect is better than that in freshwater mixing UHPC. The phenomenon can be attributed to the earlier and longer releasing water time of zeolite in seawater mixing UHPC. As the strength of porous zeolite is lower than that of river sand, the early compressive strength of seawater mixing UHPC gradually decreases with the increase of zeolite content. After curing 28 d, because the internal curing effect of zeolite optimizes the interfacial transition zone, the later hardening paste is further compacted.

Key words: seawater mixing, ultra-high performance concrete, zeolite, autogenous shrinkage, internal curing, chloride ion, interfacial transition zone

CLC Number:

TU528

SUN Meijuan, YAO Piqiang, HUANG Xiong, YU Rui, SHUI Zhonghe, JIANG Chunyuan, FAN Dingqiang. Effect of Zeolite on Properties of Seawater Mixing Ultra-High Performance Concrete (UHPC)[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1649-1655.

References

[1] 陈宝春,季韬,黄卿维,等.超高性能混凝土研究综述[J].建筑科学与工程学报,2014,31(3):1-24.
CHEN B C, JI T, HUANG Q W, et al. Review of research on ultra-high performance concrete[J]. Journal of Architecture and Civil Engineering, 2014, 31(3): 1-24 (in Chinese).
[2] 王德辉,史才军,吴林妹.超高性能混凝土在中国的研究和应用[J].硅酸盐通报,2016,35(1):141-149.
WANG D H, SHI C J, WU L M. Research and applications of ultra-high performance concrete (UHPC) in China[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(1): 141-149 (in Chinese).
[3] 练松松,孟涛,赵羽习,等.阻锈剂对海水拌和再生胶砂力学性能和钢筋腐蚀行为的影响研究[J].硅酸盐通报,2021,40(8):2546-2553.
LIAN S S, MENG T, ZHAO Y X, et al. Effects of corrosion inhibitors on mechanical properties and corrosion behavior of recycled mortar mixed with seawater[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(8): 2546-2553 (in Chinese).
[4] LI Q, GENG H N, HUANG Y, et al. Chloride resistance of concrete with metakaolin addition and seawater mixing: a comparative study[J]. Construction and Building Materials, 2015, 101: 184-192.
[5] JUN Y B, KIM T, KIM J H. Chloride-bearing characteristics of alkali-activated slag mixed with seawater: effect of different salinity levels[J]. Cement and Concrete Composites, 2020, 112: 103680.
[6] LI Q, GENG H N, SHUI Z H, et al. Effect of metakaolin addition and seawater mixing on the properties and hydration of concrete[J]. Applied Clay Science, 2015, 115: 51-60.
[7] 易双秦,刘开志,邱晶,等.吸水珊瑚砂作为超高性能混凝土(UHPC)内养护介质的研究[J].硅酸盐通报,2019,38(8):2506-2512.
YI S Q, LIU K Z, QIU J, et al. Study on pre-wet coral sand as internal curing agent in ultra-high performance concrete(UHPC)[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2506-2512 (in Chinese).
[8] 黄政宇,王嘉.高吸水性树脂对超高性能混凝土性能的影响[J].硅酸盐通报,2012,31(3):539-544.
HUANG Z Y, WANG J. Effects of SAP on the performance of UHPC[J]. Bulletin of the Chinese Ceramic Society, 2012, 31(3): 539-544 (in Chinese).
[9] XIE T, FANG C, MOHAMAD ALI M S, et al. Characterizations of autogenous and drying shrinkage of ultra-high performance concrete (UHPC): an experimental study[J]. Cement and Concrete Composites, 2018, 91: 156-173.
[10] LIU Y L, WEI Y. Effect of calcined bauxite powder or aggregate on the shrinkage properties of UHPC[J]. Cement and Concrete Composites, 2021, 118: 103967.
[11] WU L M, FARZADNIA N, SHI C J, et al. Autogenous shrinkage of high performance concrete: a review[J]. Construction and Building Materials, 2017, 149: 62-75.
[12] SUN Y, YU R, SHUI Z H, et al. Understanding the porous aggregates carrier effect on reducing autogenous shrinkage of ultra-high performance concrete (UHPC) based on response surface method[J]. Construction and Building Materials, 2019, 222: 130-141.
[13] LIU K Z, YU R, SHUI Z H, et al. Optimization of autogenous shrinkage and microstructure for ultra-high performance concrete (UHPC) based on appropriate application of porous pumice[J]. Construction and Building Materials, 2019, 214: 369-381.
[14] LIU K Z, YU R, SHUI Z H, et al. Effects of pumice-based porous material on hydration characteristics and persistent shrinkage of ultra-high performance concrete (UHPC)[J]. Materials (Basel, Switzerland), 2018, 12(1): 11.
[15] LI P R, LI W G, SUN Z H, et al. Development of sustainable concrete incorporating seawater: a critical review on cement hydration, microstructure and mechanical strength[J]. Cement and Concrete Composites, 2021, 121: 104100.
[16] LI H, FARZADNIA N, SHI C J. The role of seawater in interaction of slag and silica fume with cement in low water-to-binder ratio pastes at the early age of hydration[J]. Construction and Building Materials, 2018, 185: 508-518.
[17] 刘剑辉.SAP与FLWA在超高性能混凝土中的内养护作用[D].长沙:湖南大学,2019:43-45.
LIU J H. Internal curing of SAP and FLWA in ultra-high performance concrete[D]. Changsha: Hunan University, 2019: 43-45 (in Chinese)
[18] 王猛.掺加多孔保水材料对内养护混凝土性能的作用及分析[D].长春:吉林建筑大学,2019:32-33.
WANG M. Effect and analysis of adding porous water retaining material to curing concrete performance[D]. Changchun: Jilin Jianzhu University, 2019: 32-33 (in Chinese).