碳化作用下水泥浆内亚硝酸根离子的含量分布

doi:10.13229/j.cnki.jdxbgxb20171296

摘要/Abstract

摘要：

通过电子探针微区分析(EPMA)和X射线衍射分析(XRD)技术探明了碳化对硬化水泥浆内亚硝酸根离子分布的影响，阐明了游离亚硝酸根离子的迁移和吸附规律，有利于精确评价亚硝酸根离子在混凝土中的阻锈作用。结果表明：含亚硝酸盐的水泥浆体水化后生成新的水化产物结晶相NO₂?AFm，并均匀分布于水泥浆内。NO₂?AFm在碳化过程中重新分解生成亚硝酸根离子并向未碳化区扩散，致使碳化区NO₂?含量减少，非碳化区NO₂?含量增加。由于碳化过程中C?S?H凝胶分解，吸附于凝胶表面的游离亚硝酸根离子重新转变成游离态，碳化区游离态亚硝酸根离子含量增多，同时硅元素从碳化区向未碳化区迁移，未碳化区C?S?H凝胶非晶态含量增加，提高了游离态亚硝酸根离子的固化率，使碳化区游离态亚硝酸根离子含量高于未碳化区。

关键词: 道路工程, 水泥浆体, 碳化, 亚硝酸根离子, 电子探针微区分析, NO₂?AFm

Abstract:

The influence of carbonization on the distribution of nitrite ions in hardened cement paste is verified by electron probe microanalysis (EPMA) and X-ray diffraction (XRD), and the migration and adsorption of free nitrite ions in cement paste is clarified, which is important to accurately evaluates the corrosion-resistant effect of nitrite ion on reinforced concrete. The results reveal that a new hydrated crystallization phase NO₂?AFm is produced after the hydration of nitrite-containing cement paste and is evenly distributed. During the carbonation process, NO₂?AFm re-decomposes and generates nitrite ions, diffusing to non-carbonized area. This results in a decrease of NO₂?content in carbonized area and an increase in non-carbonized area. Nevertheless, due to the decomposition of C?S?H gel during the carbonization process, the free nitrite ions adsorbed on its surface are re?transformed into free nitrite ion, increasing the content of free nitrite in the carbonization area. Meanwhile, the migration of silicon from carbonized area into non?carbonized area, contributes to a higher amorphous content of C?S?H gel in non-carbonized area, which increases the solidified effect of nitrite ion, and eventually leads to a higher nitrite ion content in carbonized area than that in non-carbonized area.

Key words: road engineering, cement paste, carbonation, nitrite ion, electron probe microanalysis(EPMA), NO₂?AFm

中图分类号:

TQ172

李晓珍,柳俊哲,戴燕华,贺智敏,巴明芳,李玉顺. 碳化作用下水泥浆内亚硝酸根离子的含量分布[J]. 吉林大学学报(工学版), 2019, 49(4): 1162-1168.

Xiao⁃zhen LI,Jun⁃zhe LIU,Yan⁃hua DAI,Zhi⁃min HE,Ming⁃fang BA,Yu⁃shun LI. Effect of carbonation on nitrite ion distribution in cement paste[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(4): 1162-1168.

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参考文献 24

1	Marques P F , Chastre C , Nunes A . Carbonation service life modelling of RC structures for concrete with Portland and blended cements[J]. Cement and Concrete Composites, 2013, 37(6):171⁃184.
2	Kwon S J , Song H W . Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling[J]. Cement and Concrete Research, 2010, 40(1): 119⁃127.
3	Liu Jun⁃zhe , Ba Ming⁃fang , Du Yin⁃gang , et al . Effects of chloride ions on carbonation rate of hardened cement paste by X⁃ray CT technic[J]. Construction and Building Materials, 2016, 122(7): 619⁃627.
4	Li Qin⁃fei , Ge Yong , Yang Wen⁃cui . Effect of sodium sulfate and sodium nitrite on air⁃void system in airentrained concrete[J]. Magazine of Concrete Research, 2016, 68(23): 1200⁃1209.
5	Fayala I , Dhouibi L , Nóvoa X R , et al . Effect of inhibitors on the corrosion of galvanized steel and on mortar properties[J]. Cement Concrete Comp, 2013, 35(1): 181⁃189.
6	Goulart C M , Esteves-Souza A , Martinez⁃Huitle C A , et al . Experimental and theoretical evaluation of semicarbazones and thiosemicarbazones as organic corrosion inhibitors[J]. Corrosion Science, 2013, 67:281⁃291.
7	Rakanta E , Zafeiropoulou T , Batis G . Corrosion protection of steel with DMEA⁃based organic inhibitor[J]. Construction and Building Materials, 2013, 44:507⁃513.
8	Verbruggen H , Terryn H , De Graeve I . Inhibitor evaluation in different simulated concrete pore solution for the protection of steel rebar[J]. Construction and Building Materials, 2016, 124: 887⁃896.
9	Mu G N , Li X H , Qu Q . Molybdate and tungstate as corrosion inhibitors for cold rolling steel in hydrochloric acid solution[J]. Corrosion Science, 2006, 48(2): 445⁃459.
10	Sanchez M , Alonso M C . Electrochemical chloride removal in reinforced concrete structures: improvement of effectiveness by simultaneous migration of calcium nitrite[J]. Construction and Building Materials, 2011, 25(2): 873⁃878.
11	Wong H S , Zhao Y X , Karimi A R , et al . On the penetration of corrosion products from reinforcing steel into concrete due to chloride⁃induced corrosion[J]. Corrosion Science, 2010, 52(7): 2469⁃2480.
12	Álvarez⁃Bustamante R , Negrón⁃Silva G , Abreu⁃Quijano M . Electrochemical study of 2⁃merca⁃ ptoimidazole as a novel corrosion inhibitor for steels[J]. Electrochimica Acta, 2009, 54(23): 5393⁃5399.
13	Valcarce M B , Vázquez M . Carbon steel passivity examined in solutions with a low degree of carbonation: the effect of chloride and nitrite ions[J]. Materials Chemistry and Physics, 2009, 115(1): 313⁃321.
14	El Haleem S M A , El Wanees S A , El Aal E E A , et al . Environmental factors affecting the corrosion behavior of reinforcing steel. IV. variation in the pitting corrosion current in relation to the concentration of the aggressive and the inhibitive anions[J]. Corrosion Science, 2010, 52(5): 1675⁃1683.
15	Yohai L , Schreiner W , Valcarce M B , et al . Inhibiting steel corrosion in simulated concrete with low phosphate to chloride ratios[J]. Journal of the Electrochemical Society, 2016, 163(13): 729⁃737.
16	Okeniyi J O , Omotosho O A , Ajayi O O . Effect of potassium⁃chromate and sodium⁃nitrite on concrete steel⁃rebar degradation in sulphate and saline media[J]. Construction and Building Materials, 2014, 50: 448⁃456.
17	柳俊哲, 袁伟静, 贺智敏, 等 . 碳化对混凝土碱骨料反应的影响[J]. 吉林大学学报: 工学版, 2015, 45(3): 783⁃787.
	Liu Jun⁃zhe , Yuan Wei⁃jing , He Zhi⁃min , et al . Influence of carbonation on alkali⁃aggregate reaction in concrete[J]. Journal of Jilin University(Engineering and Technology Edition), 2015, 45(3): 783⁃787.
18	Al⁃Mehthel M , Al⁃Dulaijan S , Al⁃Idi S H , et al . Performance of generic and proprietary corrosion inhibitors in chloride⁃contaminated silica fume cement concrete[J]. Construction and Building Materials, 2009, 23(5): 1768⁃1774.
19	Tommaselli M A G , Mariano N A , Kuri S E . Effectiveness of corrosion inhibitors in saturated calcium hydroxide solutions acidified by acid rain components[J]. Construction and Building Materials, 2009, 23(1): 328⁃333.
20	Lee H , Ryu H , Park W , et al . Comparative study on corrosion protection of reinforcing steel by using amino alcohol and lithium nitrite inhibitors[J]. Materials, 2015, 8(1): 251⁃269.
21	Han Jian⁃de , Pan Gang⁃hua , Sun Wei . Investigation on carbonation induced meso⁃defects changes of cement mortar using 3D X⁃Ray computed tomography[J]. Journal of the Chinese Ceramic Society, 2011, 399(10):75⁃79.
22	Lu S , Landis E N , Keane D T . X⁃ray microtomographic studies of pore structure and permeability in portland cement concrete[J]. Materials and Structures, 2006, 39(6): 611⁃620.
23	Rougelot T , Burlion N , Bernard D D , et al . About microcracking due to leaching in cementitious composites: X⁃ray microtomography description and numerical approach[J]. Cement and Concrete Research, 2010, 40(2): 271⁃283.
24	Cao Yan⁃hui , Dong Shi⁃gang . Multifunctional inhibition based on layered double hydroxides to comprehensively control corrosion of carbon steel in concrete[J]. Corrosion Science, 2017, 126(9):166⁃179.

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