基于改进物元可拓模型的水工混凝土耐久性影响因素分析

摘要/Abstract

摘要： 我国西北盐渍地区长距离输水工程由于冻融、干湿、盐侵等作用,对水工混凝土耐久性产生不利影响,直接影响输水稳定性及工程的安全运行与效益发挥。本文以甘肃省引大入秦工程输水建筑物为背景,基于室内加速试验,针对干湿-冻融和干湿-冻融-盐侵两种工况,研究质量损失率、抗压强度损失率、相对动弹性模量等耐久性指标变化情况,采用改进物元可拓模型综合分析矿粉、粉煤灰、引气剂、聚丙烯4种因素对水工混凝土耐久性的影响程度,并将计算结果与试验结果、实际状况开展比对分析。结果表明:在干湿-冻融工况中,粉煤灰对于水工混凝土耐久性的影响较矿粉、引气剂、聚丙烯显著,而在干湿-冻融-盐侵工况中,聚丙烯的影响最为显著,且最为敏感;采用改进物元可拓模型综合分析以上4种影响因素,影响程度依次为聚丙烯(3.450 9)＞粉煤灰(2.509 0)＞矿粉(2.447 2)＞引气剂(2.232 5),且根据等级变量特征值的大小可判断大循环后混凝土试块的状态,与实际状况相符。因此改进物元可拓模型可以综合分析盐渍区水工混凝土耐久性的影响因素,具有一定的实用价值。

关键词: 改进物元可拓模型, 水工混凝土, 室内加速试验, 耐久性, 影响程度排序, 等级变量特征值

Abstract: Due to freeze-thaw, dry-wet, salt intrusion and so on, the durability of hydraulic concrete which is of the long-distance water conveyance project in the saline areas of Northwest China has a negative influence, which directly affects the water conveyance stability and the operation safety and the benefit. In this paper, based on the water delivery structure of the Gansu Yinda-Qin project and accelerated indoor test, the changes of durability indexes such as mass loss rate, compressive strength loss rate and relative dynamic modulus of elasticity were studied for two working conditions: dry-wet-freeze-thaw cycle and dry-wet-freeze-thaw-salt invasion cycle. And the improved matter-element extension model was used to analyze the effects of four factors, namely, slag powder, fly ash, air-entraining agent and polypropylene, on the durability of hydraulic concrete. The influencing degree of four factors on the durability of hydraulic concrete was analyzed, and the calculated results were compared with the test results and the actual situations. The results show that in the dry-wet-freeze-thaw condition, the influence of fly ash on the durability of hydraulic concrete is more significant than that of slag powder, air entraining agent and polypropylene, while in the dry-wet-freeze-thaw-salt invasion condition, the influence of polypropylene is the most significant and sensitive. The improved matter-element extension model is used to comprehensively analyze the above four factors, and the influencing degree is polypropylene (3.450 9) > fly ash (2.509 0) > mineral powder (2.447 2) > engraver (2.232 5). According to the size of the characteristic value of the grade variable, the state of the concrete test block after large circulation can be judged, which is consistent with the actual situation. Therefore,the improved matter-element extension model can comprehensively analyze the influencing factors of the durability of hydraulic concrete in the saline areas and has certain practical value.

Key words: improved matter-element extension model, hydraulic concrete, indoor accelerated test, durability, rank of influencing degree, characteristic value of grade variable

中图分类号:

TU528

张娇艳, 贡力, 贾治元, 李义强, 康春涛. 基于改进物元可拓模型的水工混凝土耐久性影响因素分析[J]. 硅酸盐通报, 2022, 41(5): 1617-1626.

ZHANG Jiaoyan, GONG Li, JIA Zhiyuan, LI Yiqiang, KANG Chuntao. Analysis on Influencing Factors of Durability of Hydraulic Concrete Based on Improved Matter-Element Extension Model[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1617-1626.

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