Basic Mechanical Properties of Grouting Material for Offshore Wind Power Foundation under Different Seawater Pressures

Abstract

Abstract: The connection between offshore wind power foundation structures and steel pipe piles is usually carried out by grouting. With the development of offshore wind power to deep sea, the grouting connection between wind power foundation and steel pipe piles is deeper and deeper in underwater position. To determine the influence of seawater pressure on the basic mechanical properties of grouting material, the grouting material specimens were placed in a pressure vessel for curing, and then their basic mechanical properties such as compressive strength, flexural strength, and elastic modulus were tested. In addition, the phase composition and microstructure were analyzed by X-ray diffractometer and scanning electron microscope. The results show that the compressive strength of grouting material is improved after curing under a pressure environment. Seawater pressure does not produce a “wedging” effect, but further improves the compactness of grouting material. When the seawater pressure increases from 0 MPa to 0.75 MPa, the compressive strength, flexural strength, and elastic modulus of grouting material increase by 10.7%, 2.9%, and 16.7%, respectively. Seawater pressure does not change the phase composition of grouting material, but reduces its internal porosity and increases its compactness, thus improving its mechanical properties.

Key words: grouting material, offshore wind power, seawater pressure, mechanical property, phase composition, microstructure

CLC Number:

TU528

JIANG Guangqiu, LI Zhi, ZHOU Xingzheng, ZHANG Kuoji, WU Zhaoqi. Basic Mechanical Properties of Grouting Material for Offshore Wind Power Foundation under Different Seawater Pressures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4055-4060.

References

[1] 田伟丽, 汪冬冬, 高健岳. 海上风电项目中导管架基础施工技术综述[J]. 中国港湾建设, 2020, 40(5): 20-24.
TIAN W L, WANG D D, GAO J Y. Summary of jacket foundation construction technology in offshore wind power project[J]. China Harbour Engineering, 2020, 40(5): 20-24 (in Chinese).
[2] WILKE F. Load bearing behaviour of grouted joints subjected to predominant bending[D]. Hannover: Leibniz University Hannover, 2014.
[3] 丁成. 超高性能海上风电灌浆料试验研究[D]. 广州: 华南理工大学, 2021.
DING C. Experimental study on ultra-high performance offshore wind power grouting material[D]. Guangzhou: South China University of Technology, 2021 (in Chinese).
[4] 马奎鑫. 低周循环荷载作用下海上风机灌浆连段力学性能研究[D]. 东营: 中国石油大学(华东), 2020.
MA K X. Study on mechanical properties of grouting section of offshore fan under low cycle load[D]. Dongying: China University of Petroleum (Huadong), 2020 (in Chinese).
[5] 王根梁. 海上风电大直径高强灌浆连接轴向力学性能研究[D]. 福州: 福州大学, 2020.
WANG G L. Study on axial mechanical properties of large diameter and high strength grouting connection for offshore wind power[D]. Fuzhou: Fuzhou University, 2020 (in Chinese).
[6] 陈涛, 张持海, 赵淇, 等. 海上风机基础灌浆连接段抗震性能试验[J]. 船舶与海洋工程, 2018, 34(5): 1-8.
CHEN T, ZHANG C H, ZHAO Q, et al. Experimental study on the seismic behavior of grouted connection of offshore wind turbine foundations[J]. Naval Architecture and Ocean Engineering, 2018, 34(5): 1-8 (in Chinese).
[7] 陈涛, 张持海, 赵淇, 等. 海上风机基础灌浆连接段压弯性能有限元分析[J]. 结构工程师, 2019, 35(2): 93-100.
CHEN T, ZHANG C H, ZHAO Q, et al. Numerical analysis of grouted connection for offshore wind turbine substructures[J]. Structural Engineers, 2019, 35(2): 93-100 (in Chinese).
[8] 宋普涛, 王晶, 冷发光, 等. 塑性膨胀剂对海上风电超高性能灌浆料性能的影响[J]. 硅酸盐通报, 2023, 42(5): 1608-1614.
SONG P T, WANG J, LENG F G, et al. Effect of plastic expansive agent on properties of ultra-high performance grouting material for offshore wind power[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(5): 1608-1614 (in Chinese).
[9] 王乾峰, 刘云贺, 彭刚. 水压力环境中混凝土的含水量及其对力学性能的影响[J]. 水利学报, 2017, 48(2): 193-202.
WANG Q F, LIU Y H, PENG G. Water content in concrete under water pressure environment and the effect on its mechanical properties[J]. Journal of Hydraulic Engineering, 2017, 48(2): 193-202 (in Chinese).
[10] 王海龙, 李庆斌. 饱和混凝土的弹性模量预测[J]. 清华大学学报(自然科学版), 2005, 45(6): 761-763+775.
WANG H L, LI Q B. Saturated concrete elastic modulus prediction[J]. Journal of Tsinghua University (Science and Technology), 2005, 45(6): 761-763+775 (in Chinese).
[11] 陈宇良, 吉云鹏, 陈宗平, 等. 钢纤维再生混凝土三轴受压力学性能试验[J]. 复合材料学报, 2022, 39(8): 4005-4016.
CHEN Y L, JI Y P, CHEN Z P, et al. Experiment on mechanical properties of steel fiber recycled aggregate concrete under triaxial compression[J]. Acta Materiae Compositae Sinica, 2022, 39(8): 4005-4016 (in Chinese).
[12] 王开强, 孙庆, 董耀武, 等. 压力养护钢管混凝土的力学性能和微观结构[J]. 建筑材料学报, 2023, 26(10): 1096-1103.
WANG K Q, SUN Q, DONG Y W, et al. Mechanical properties and microstructure of concrete filled steel tube hardening under pressure curing[J]. Journal of Building Materials, 2023, 26(10): 1096-1103 (in Chinese).
[13] 王海龙, 李庆斌. 孔隙水对湿态混凝土抗压强度的影响[J]. 工程力学, 2006, 23(10): 141-144+179.
WANG H L, LI Q B. Effect of pore water on the compressive strength of wet concrete[J]. Engineering Mechanics, 2006, 23(10): 141-144+179 (in Chinese).
[14] 李宗利, 杜守来. 高渗透孔隙水压对混凝土力学性能的影响试验研究[J]. 工程力学, 2011, 28(11): 72-77.
LI Z L, DU S L. Experimental study on mechanical properties of concrete due to high seepage pore water pressure[J]. Engineering Mechanics, 2011, 28(11): 72-77 (in Chinese).[15] 李庆斌, 陈樟福生, 孙满义, 等. 真实水荷载对混凝土强度影响的试验研究[J]. 水利学报, 2007, 38(7): 786-791.
LI Q B, CHEN Z F S, SUN M Y, et al. Effect of water loading on strength of concrete[J]. Journal of Hydraulic Engineering, 2007, 38(7): 786-791 (in Chinese).
[16] TAM C M, TAM V W Y, NG K M. Assessing drying shrinkage and water permeability of reactive powder concrete produced in Hong Kong[J]. Construction and Building Materials, 2012, 26: 79-89.
[17] IPEK M, YILMAZ K, SÜMER M, et al. Effect of pre-setting pressure applied to mechanical behaviours of reactive powder concrete during setting phase[J]. Construction and Building Materials, 2011, 25(1): 61-68.
[18] YAZICI H, YIĞITER H, KARABULUT A Ş, et al. Utilization of fly ash and ground granulated blast furnace slag as an alternative silica source in reactive powder concrete[J]. Fuel, 2008, 87(12): 2401-2407.
[19] OSHITA H, TANABE T A. Water migration phenomenon in concrete in postpeak region[J]. Journal of Engineering Mechanics, 2000, 126(6): 573-581.
[20] 赖建中, 孙伟. 生态型RPC材料的力学性能及微观机理研究[J]. 新型建筑材料, 2009, 36(12): 20-23.
LAI J Z, SUN W. Study on mechanical properties and micro-mechanism of ecological reactive powder concrete[J]. New Building Materials, 2009, 36(12): 20-23 (in Chinese).
[21] ZHANG D, JIANG J W, ZHANG Z W, et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments[J]. Construction and Building Materials, 2024, 416: 135146.