盐溶液干湿循环作用下钢渣细骨料混凝土的耐久性

doi:10.6040/j.issn.1672-3961.0.2024.227

摘要/Abstract

摘要： 为研究盐溶液干湿循环作用下钢渣细骨料混凝土(steel slag fine aggregate concrete, SSC)的耐久性,通过力学性能试验确定钢渣和粉煤灰在混凝土中的最佳体积分数,并对混凝土试样进行盐溶液干湿耐久性试验,综合考虑钢渣、粉煤灰体积分数对混凝土的外观、质量、动弹性模量及抗压强度的影响。结果表明:钢渣体积分数为30%时,SSC的抗压强度、抗折强度、动弹性模量均优于普通混凝土;继续掺入10%体积分数的粉煤灰后,SSC各项力学性能指标进一步提高;100次盐溶液干湿循环后,钢渣体积分数为30%的SSC质量损失率、抗压强度损失率、动弹性模量损失率均小于普通混凝土,继续掺入10%体积分数的粉煤灰可延缓SSC耐久性能劣化,且SSC在单盐溶液干湿循环作用的耐久性好于复盐溶液;以动弹性模量损伤为指标建立了损伤演化方程,可较好地描述盐溶液干湿循环作用下SSC性能的劣化过程。

关键词: 钢渣细骨料混凝土, 盐蚀, 干湿循环, 耐久性, 损伤演化

Abstract: In order to study the durability of steel slag fine aggregate concrete(SSC)under the action of dry-wet cycle of salt solution, the optimal volume fraction of steel slag and fly ash in concrete was determined by mechanical property tests, and the dry and wet durability test of salt solution was carried out on concrete samples. The effects of the volume fraction of steel slag and fly ash on the appearance, quality, dynamic elastic modulus, and compressive strength of concrete were considered comprehensively. The results showed that when the volume fraction of steel slag was 30%, the compressive strength, flexural strength, and dynamic elastic modulus of SSC were better than those of ordinary concrete. The mechanical properties of SSC were further improved after 10% volume fraction of fly ash was added. After 100 dry-wet cycles of salt solution, the mass loss rate, compressive strength loss rate, and dynamic elastic modulus loss rate of steel slag with 30% volume fraction were smaller than those of ordinary concrete. The addition of 10% volume fraction fly ash could delay the deterioration of SSC durability, and the durability of SSC in dry and wet cycling of single salt solution was better than that of double salt solution. The damage evolution equation was established with the dynamic elastic modulus damage as the index, which could describe the deterioration of SSC properties under the dry-wet cycle of salt solution.

Key words: steel slag fine aggregate concrete, salt corrosion, dry-wet cycle, durability, damage evolution

中图分类号:

TU528.51

薛刚,邱永康,秦政博,董伟. 盐溶液干湿循环作用下钢渣细骨料混凝土的耐久性[J]. 山东大学学报 (工学版), 2025, 55(5): 130-139.

XUE Gang, QIU Yongkang, QIN Zhengbo, DONG Wei. Durability of steel slag fine aggregate concrete under the action of salt solution wet and dry circulation[J]. Journal of Shandong University(Engineering Science), 2025, 55(5): 130-139.

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