Effects of Corrosion Inhibitors on Mechanical Properties and Corrosion Behavior of Recycled Mortar Mixed with Seawater

Abstract

Abstract: In view of the durability of reclaimed aggregate mixed with seawater, effects of corrosion inhibitors on mechanical properties and corrosion behavior of recycled mortar mixed with seawater were analyzed and the mechanism was revealed through microscopic experiments such as X-ray diffraction analysis (XRD) and mercury intrusion (MIP). The results show that recycled mortar mixed with seawater has a fast corrosion speed in the early stage, and then the corrosion speed slows down after 7 d and gradually tends to passivation. In addition, aminomethyl propanol has an adverse effect on mechanical properties of the mortar and accelerates the corrosion of steel bars. The main reason is that aminomethyl propanol inhibits the cement hydration process and increases the number of pores. Sodium metasilicate pentahydrate has a significant rust-inhibiting effect, which is beneficial to promote the passivation of steel bars in recycled mortar mixed with seawater. At the same time, sodium metasilicate pentahydrate is helpful to promote the formation of C-S-H in the mortar and optimizes the pore structure, which has little effect on mechanical properties of recycled mortar mixed with seawater. This research provides reference for the improvement of durability and service safety of recycled concrete mixed with seawater.

Key words: corrosion inhibitor, seawater, recycled mortar, steel corrosion, mechanical property

CLC Number:

TU528.042

LIAN Songsong, MENG Tao, ZHAO Yuxi, LU Yuqi. 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.

References

[1] 黄亮,谢建和,陆中宇.海水海砂混凝土研究现状与应用前景[J].混凝土,2020(9):155-160.
HUANG L, XIE J H, LU Z Y. Research progress and prospects on seawater sea-sand concrete[J]. Concrete, 2020(9): 155-160 (in Chinese).
[2] WEGIAN F M. Effect of seawater for mixing and curing on structural concrete[J]. The IES Journal Part A: Civil & Structural Engineering, 2010, 3(4): 235-243.
[3] 李薛忠,吴庆,王刚,等.海水海砂混凝土中钢筋锈蚀的电化学特征[J].混凝土,2020(7):20-24.
LI X Z, WU Q, WANG G, et al. Electrochemical characteristics of steel corrosion in seawater sea-sand concrete[J]. Concrete, 2020(7): 20-24 (in Chinese).
[4] 宋旭艳,姜正平,韩静云,等.海砂混凝土中钢筋锈蚀情况研究[J].混凝土与水泥制品,2019(9):19-23.
SONG X Y, JIANG Z P, HAN J Y, et al. Study on corrosion of steel bars in sea sand concrete[J]. China Concrete and Cement Products, 2019(9): 19-23 (in Chinese).
[5] WU Q, LI X Z, XU J, et al. Size distribution model and development characteristics of corrosion pits in concrete under two curing methods[J]. Materials, 2019, 12(11): 1846.
[6] DIAS W, SENEVIRATNE G, NANAYAKKARA S. Offshore sand for reinforced concrete[J]. Construction and Building Materials, 2008, 22(7): 1377-1384.
[7] 李师财,于泳,金祖权.海水海砂混凝土力学性能与耐久性研究综述[J].硅酸盐通报,2020,39(12):3743-3752.
LI S C, YU Y, JIN Z Q. Review on mechanical properties and durability of seawater and sea-sand concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(12): 3743-3752 (in Chinese).
[8] SÖYLEV T A, RICHARDSON M G. Corrosion inhibitors for steel in concrete: state-of-the-art report[J]. Construction and Building Materials, 2008, 22(4): 609-622.
[9] IBRAHIMI B E, JMIAI A, BAZZI L, et al. Amino acids and their derivatives as corrosion inhibitors for metals and alloys[J]. Arabian Journal of Chemistry, 2020, 13(1): 740-771.
[10] 刘芳,卢勇.纤维素基缓蚀剂在金属防腐蚀中的应用进展[J].材料保护,2018,51(5):115-121.
LIU F, LU Y. Application progress of cellulosic corrosion inhibitor in metal corrosion resistance[J]. Materials Protection, 2018, 51(5): 115-121 (in Chinese).
[11] 王晓彤,孙丛涛,程火焰.氨基醇类阻锈剂的阻锈机理[J].硅酸盐通报,2017,36(1):84-88.
WANG X T, SUN C T, CHENG H Y. Inhibition mechanism of amino alcohol corrosion inhibitors[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(1): 84-88 (in Chinese).
[12] 张航,陈国福,宋开伟,等.适用于海水海砂混凝土阻锈剂的作用机理[J].材料导报,2014,28(20):116-121.
ZHANG H, CHEN G F, SONG K W, et al. The mechanism action of corrosion inhibitor for concrete based on seawater and sea sands[J]. Materials Review, 2014, 28(20): 116-121 (in Chinese).
[13] 杨长辉,张航,欧忠文,等.适用于海水海砂混凝土的阻锈剂[J].混凝土,2010(11):69-72.
YANG C H, ZHANG H, OU Z W, et al. Corrosion inhibitor for concrete based on seawater and sea sands[J]. Concrete, 2010(11): 69-72 (in Chinese).
[14] XU C X, OU Z W, ZHOU J L, et al. Investigation on protectional ability on steel bar of compound corrosion inhibitor applied in seawater-and-sea sand concrete[J]. Applied Mechanics and Materials, 2011, 71/72/73/74/75/76/77/78: 864-870.
[15] 周俊龙,欧忠文,江世永,等.掺阻锈剂掺合料海水海砂混凝土护筋性探讨[J].建筑材料学报,2012,15(1):69-74.
ZHOU J L, OU Z W, JIANG S Y, et al. Discussion of rebar-protecting properties of seawater-seasand concrete mixed with admixture and corrosion inhibitor[J]. Journal of Building Materials, 2012, 15(1): 69-74 (in Chinese).
[16] PAN C G, LI X, MAO J H. The effect of a corrosion inhibitor on the rehabilitation of reinforced concrete containing sea sand and seawater[J]. Materials, 2020, 13(6): 1480.
[17] ANDRADE C, GONZÁLEZ J A. Quantitative measurements of corrosion rate of reinforcing steels embedded in concrete using polarization resistance measurements[J]. Materials and Corrosion, 1978, 29(8): 515-519.