基于Wiener过程寿命预测的再生骨料混凝土耐久性能变化规律的研究

乔宏霞; 苏睿; 李琼; 李奥阳; 孙鑫

doi:10.13204/j.gyjzG21110802

基于Wiener过程寿命预测的再生骨料混凝土耐久性能变化规律的研究

doi: 10.13204/j.gyjzG21110802

乔宏霞^1,2,
苏睿^1, ,,
李琼¹,
李奥阳¹,
孙鑫¹

1. 兰州理工大学土木工程学院, 兰州 730050;
2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 兰州 730050

基金项目:

国家自然科学基金项目(52178216)。

详细信息

作者简介:
乔宏霞,女,1977年出生,教授,博士生导师。

通讯作者:
苏睿,1141241314@qq.com。

计量
- 文章访问数: 115
- HTML全文浏览量: 14
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2021-11-08
- 网络出版日期: 2022-09-05

Research on Variation Law of Durability of Recycled Aggregate Concrete Based on Wiener Process Life Prediction

QIAO Hongxia^1,2,
SU Rui^{1
, ,},
LI Qiong¹,
LI Aoyang¹,
SUN Xin¹

1. College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Engineering Research Center of Ministry of Education for Disaster Prevention and Reduction of Civil Engineering in Western Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 为研究再生骨料混凝土(RAC)在硫酸盐干湿循环及冻融循环条件下耐久性能的劣化过程,选取再生骨料替代率(0、30%、50%、70%)、粉煤灰掺量(10%、20%、30%)、硅灰掺量(5%、8%、12%)和单掺、复掺等方式为影响因素,研究其对RAC耐久性的影响规律。采用质量损失率和相对动弹性模量描述上述影响因素对RAC耐久性能退化的作用机理。基于冻融循环试验下RAC的相对动弹性模量,采用一元Wiener随机过程进行建模分析其可靠度变化,预测RAC在冻融环境下的使用寿命。研究表明:在冻融循环条件下,与未掺入再生骨料、粉煤灰和硅灰的基准试件相比,随着再生骨料替代率的增加,RAC的质量损失率降幅逐渐显著;随着单掺粉煤灰、单掺硅灰掺量的增加,RAC的质量损失率呈现先降后增的趋势,相对动弹性模量呈现先增后降的趋势;当固定粉煤灰掺量20%、硅灰掺量8%时,随着再生粗骨料替代率的增加,RAC的质量损失率和相对动弹性模量降幅逐渐显著。在硫酸盐干湿循环条件下,随着再生骨料替代率的增加,RAC的相对动弹性模量降幅逐渐显著。依据一元Wiener方法所的建模型分析可知,以30%替代率采用再生骨料替代天然骨料并掺加20%粉煤灰和8%硅灰所制备的RAC模型可靠度持续时间最长。
- 再生骨料混凝土 /
- 硫酸盐干湿循环 /
- 冻融循环 /
- 可靠度计算 /
- 一元Wiener
Abstract: In order to study the degradation process of durability of recycled aggregate concrete (RAC) under sulfate dry-wet cycle and freeze-thaw cycle, the replacement rate of recycled aggregate (0, 30%, 50%, 70%), fly ash content (10%, 20%, 30%), silica fume content (5%, 8%, 12%), and single and mixed methods were selected as influencing factors to study the influence law of RAC durability. The mass loss rate and relative dynamic elastic modulus were used to describe the mechanism of the above influencing factors on the degradation of RAC durability. Based on the relative dynamic elastic modulus of RAC in freeze-thaw cycle test, the reliability change of RAC was analyzed by using a single Wiener random process to predict the service life of RAC under freeze-thaw environment. The research showed that under the condition of freeze-thaw cycle, compared with the reference parts without recycled aggregate, fly ash and silica fume, the mass loss rate of RAC decreased gradually with the increase of recycled aggregate content. With the increase of fly ash content and silica fume content, the mass loss rate of RAC first decreased and then increased, and the relative dynamic elastic modulus of RAC increased first and then decreased. When the fixed fly ash content was 20% and silica fume content was 8%, the mass loss rate and relative dynamic elastic modulus of RAC decreased gradually with the increase of recycled coarse aggregate content. Under the condition of sulfate dry-wet cycle, the relative dynamic elastic modulus of RAC decreased gradually with the increase of recycled aggregate content. According to the analysis of the model established by the unitary Wiener method, it could be seen that the reliability of the RAC model prepared by replacing natural aggregate with recycled aggregate at 30% substitution rate with 20% fly ash and 8% silica fume had the longest variation time.
- recycled aggregate concrete /
- sulfate dry-wet cycle /
- freeze-thaw cycle /
- reliability calculation /
- unitary Wiener

HTML全文

参考文献(26)

[1]	JIN L, YU H, WANG Z, et al. Effect of crack and damaged zone on chloride penetration in recycled aggregate concrete:a seven-phase mesoscale numerical method[J]. Construction and Building Materials, 2021, 291(7):123383-123394.
[2]	WANG Y, TANG J, AN S, et al. Optimization of mechanical properties of recycled aggregate concrete based on queuing scoring method[J]. IOP Conference Series:Earth and Environmental Science, 2021, 768(1):012078-012081.
[3]	SHANG X, YANG J, WANG S, et al. Fractal analysis of 2D and 3D mesocracks in recycled aggregate concrete using X-ray computed tomography images[J]. Journal of Cleaner Production, 2021, 304:127083-127095.
[4]	BAMIGBOYE G O, TARVERDI K, WALI E S, et al. Effects of dissimilar curing systems on the strength and durability of recycled PET-modified concrete[J]. Silicon, 2021,898(20):1-13.
[5]	成高立,李晓光. 再生骨料构成对混凝土性能的影响[J]. 硅酸盐通报, 2018, 37(3):1103-1108 ,1113.
[6]	李滢,代大虎,余红发. 再生细骨料对再生混凝土力学性能及耐久性能的影响研究[J]. 混凝土, 2016(12):76-78.
[7]	权伟博. 再生骨料混凝土性能研究[J]. 四川建材, 2021, 47(5):243-244.
[8]	肖建庄,林壮斌,朱军. 再生骨料级配对混凝土抗压强度的影响[J]. 四川大学学报(工程科学版), 2014, 46(4):154-160.
[9]	彭勇军. 再生混凝土性能影响因素分析及耐久性研究[J]. 建筑结构, 2021, 51(9):74-78 ,62.
[10]	邓祥辉,高晓悦,王睿,等. 再生混凝土抗冻性能试验研究及孔隙分布变化分析[J]. 材料导报, 2021,35(16):16028-16034.
[11]	YEHIA S, HELAL K, ABUSHARKH A, et al. Strength and durability evaluation of recycled aggregate concrete[J]. International Journal of Concrete Structures and Materials, 2015, 9(2):219-239.
[12]	冯琦,王宇斌. 粉煤灰再生混凝土在干湿循环-抗硫酸盐侵蚀耦合条件下的耐久性研究[J]. 混凝土, 2021(5):42-45,50.
[13]	尹兴伟,吴相豪. 矿物掺合料对再生混凝土抗冻性影响的试验研究[J]. 混凝土, 2012(8):90-93.
[14]	闫宏生. 再生混凝土的硫酸盐腐蚀试验研究[J]. 混凝土, 2013(5):13-15.
[15]	乔宏霞,冯琼,朱彬荣,等. 西部地区混凝土基于Weibull分布的寿命预测研究[J]. 应用基础与工程科学学报, 2020, 28(4):993-1005.
[16]	路承功,乔宏霞,魏智强,等. 盐渍土地区混凝土加速损伤劣化机理及基于Wiener过程可靠性分析[J]. 中国矿业大学学报, 2021, 50(2):265-272 ,288.
[17]	中华人民共和国质量监督检验检疫总局. 普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社,2019.
[18]	陈自豪,元成方. 再生骨料混凝土抗冻性研究进展[J]. 混凝土, 2019(5):20-23,27.
[19]	乔宏霞,彭宽,陈克凡,等. 干湿循环条件下陶瓷粉再生混凝土抗硫酸盐侵蚀性能及可靠性分析[J]. 应用基础与工程科学学报, 2021, 29(3):752-760.
[20]	白花蕾,樊耀虎,李滢,等. 再生微粉和矿物掺合料对混凝土抗碳化性能的影响研究[J]. 硅酸盐通报, 2020, 287(8):273-278.
[21]	孙华银,李滟浩,王燕,等. 再生混凝土冻融循环试验研究综述[J]. 科技创新与应用, 2020(22):52-53.
[22]	王晨霞,郭磊,曹芙波. 盐碱与冻融耦合作用下再生混凝土耐久性试验研究[J]. 硅酸盐通报, 2018, 37(1):10-16.
[23]	白亚东,黄志强,付旭,等. 再生混凝土抗冻性影响因素与防冻措施研究综述[J]. 混凝土, 2020(6):98-101,105.
[24]	肖建庄,雷斌. 再生混凝土碳化模型与结构耐久性设计[J]. 建筑科学与工程学报, 2008(3):66-72.
[25]	肖建庄,林壮斌,朱军. 再生骨料级配对混凝土抗压强度的影响[J]. 四川大学学报(工程科学版), 2014, 46(4):154-160.
[26]	应敬伟,肖建庄. 再生骨料取代率对再生混凝土耐久性的影响[J]. 建筑科学与工程学报, 2012(1):56-62.