部分浸泡再生混凝土Mg2+-SO42--Cl-复合盐侵蚀耐久性损伤特征与机制

doi:10.11896/cldb.22060026

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Abstract In order to investigate the durability degradation characteristics and mechanism of partial burial recycled aggregate concrete (RAC) structure members in Northwest China, the durability experiment of 14 mixtures about RAC with supplementary cementitious materials (SCMs) of fly ash, granulated blast furnace slag, silica fume and metakaolin, respectively, was conducted for partial immersed in compound salt solution with MgSO₄, Na₂SO₄ and NaCl. Comprehensively analyzed the relative dynamic elastic modulus, macro-and micro-morphology, and mineral composition and its relative content, the partial immersed RAC can be divided into four corrosive zones of saturation zone, air-liquid two-phased transition zone, moisture transport zone and dry zone, respectively, along the longitudinal direction. At initial stage of partial immersed, the degradation of air-liquid two-phased transition zone was higher than that of saturation zone, while the damage in saturation zone was equal to or over than that of air-liquid two-phased transition zone at the middle and late stage. Concurrently, the damage in moisture transport zone was formed and continued to develop slowly. With immersed aging increased, the destruction mechanism of saturation zone changed from chemical attack to chemical-physical attack, while that of the air-liquid two-phased transition zone was due to chemical-physical attack. The chemistry corrosive products of brucite, anhydrite, gypsum and chloromagnesite existed throughout the corrosion, but ettringite, Friedel’s salt and Mg₁₀(OH)₁₈Cl₂·5H₂O disappeared at the late stage of corrosion. And the physical crystalline salts included blodite, halite, MgSO₄·xH₂O, thenardite and mirabilite. The phase transformation between thenardite and mirabilite formed the great salt crystallization pressure in pores and micro-cracks, which rapidly decreased of RAC durability. At immersion time of 180 days, the corrosion resistance of RAC with fly ash and GBFS was generally well, however, the loss rate of compressive strength of RAC with fly ash and silica fume was more than 60%. In addition, the durability of RAC with GBFS-silica fume-metakaolin was much higher than that of RAC with fly ash-GBFS-metakaolin, which had spalled off grievously. Although a stable decreased rate, the resistance performance of RAC with four SCMs was still at the low level, compared to that of RAC with fly ash and GBFS at the same immersed time.

Key words： recycled aggregate concrete Mg²⁺-SO₄^2--Cl^-salts corrosion partial immersion durability degradation characteristics durability degradation mechanism

Published: Online: 2024-01-16

CLC number:

TU528.44

Fund:National Natural Science Foundation of China (51908440) and the Opening Fund of State Key Laboratory of Green Building (LSKF202216).

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	WANG Jiabin
	FAN Yijie
	NIU Ditao
	WANG Yu
	ZHANG Kaifeng

Cite this article:

WANG Jiabin,FAN Yijie,NIU Ditao, et al. Durability Degradation Characteristics and Mechanism of Partial Immersed Recycled Aggregate Concrete Subjected to Composite Salt Attack of Magnesium-Sulfate-Chloride[J]. Materials Reports, 2024, 38(1): 22060026-13.

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http://www.mater-rep.com/EN/10.11896/cldb.22060026 OR http://www.mater-rep.com/EN/Y2024/V38/I1/22060026

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