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

QIAO Hongxia; SU Rui; LI Qiong; LI Aoyang; SUN Xin

doi:10.13204/j.gyjzG21110802

Volume 52 Issue 6

Sep. 2022

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2022 > 52(6): 167-173,139

QIAO Hongxia, SU Rui, LI Qiong, LI Aoyang, SUN Xin. Research on Variation Law of Durability of Recycled Aggregate Concrete Based on Wiener Process Life Prediction[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(6): 167-173,139. doi: 10.13204/j.gyjzG21110802

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QIAO Hongxia, SU Rui, LI Qiong, LI Aoyang, SUN Xin. Research on Variation Law of Durability of Recycled Aggregate Concrete Based on Wiener Process Life Prediction[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(6): 167-173,139. doi: 10.13204/j.gyjzG21110802

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

doi: 10.13204/j.gyjzG21110802

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

Received Date: 2021-11-08
Available Online: 2022-09-05

Abstract

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

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References(26)

References

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