Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining
After removing the mold from the secondary lining concrete of a tunnel, problems such as honeycomb and hemp surface easily occur. To obtain self-compacting fair-faced concrete (SCFFC) that can meet strength requirements and effectively solve the above problems, this research prepared SCFFC with diff...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-04-01
|
| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/12/4/479 |
| _version_ | 1797436531644825600 |
|---|---|
| author | Caijin Xie Tiejun Tao Keyu Huang |
| author_facet | Caijin Xie Tiejun Tao Keyu Huang |
| author_sort | Caijin Xie |
| collection | DOAJ |
| description | After removing the mold from the secondary lining concrete of a tunnel, problems such as honeycomb and hemp surface easily occur. To obtain self-compacting fair-faced concrete (SCFFC) that can meet strength requirements and effectively solve the above problems, this research prepared SCFFC with different mix proportions and performed slump expansion, slump, J-ring expansion and mechanical tests. Additionally, this research comprehensively analyzed the SCFFC based on fuzzy mathematics to study its apparent quality and service performance. This research aimed to solve problems such as uneven bubbles and poor bubble diameter in C30 SCFFC, through a combination of defoaming and air entraining by adding defoamer and air-entraining agent according to different proportions for compound treatment. The defoamer dosage was 0.5‰ of that of water reducer, and the air-entraining agent dosage was 0.1‰ of that of cement. The workability and clearance passability of the concrete were optimal. At the same time, the apparent holes in the SCFFC were small, as were their area and quantity. The distribution and apparent color of the SCFFC were uniform. Considering the factors affecting the service performance of concrete and after a comprehensive analysis of the samples’ weights, subjection degree, variability, stability, and strength index, this research found that the ratio for obtaining a C30 SCFFC material with the highest apparent quality and service performance was as follows: cement:machine-made sand:crushed dtone:fly-ash:water = 4:8.6:9.3:1:2.2. The water reducer comprised 1.0% of the total mass of the cementitious materials. The defoamer dosage was 0.5‰ of that of water reducer, and the dosage of air-entraining agent was 0.1‰ of that of cement. |
| first_indexed | 2024-03-09T11:03:58Z |
| format | Article |
| id | doaj.art-31295c3fe01542f38e419b2c014db643 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-09T11:03:58Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-31295c3fe01542f38e419b2c014db6432023-12-01T01:03:21ZengMDPI AGBuildings2075-53092022-04-0112447910.3390/buildings12040479Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary LiningCaijin Xie0Tiejun Tao1Keyu Huang2School of Civil Engineering, Guizhou University, Guiyang 550025, ChinaSchool of Civil Engineering, Guizhou University, Guiyang 550025, ChinaSchool of Civil Engineering, Guizhou University, Guiyang 550025, ChinaAfter removing the mold from the secondary lining concrete of a tunnel, problems such as honeycomb and hemp surface easily occur. To obtain self-compacting fair-faced concrete (SCFFC) that can meet strength requirements and effectively solve the above problems, this research prepared SCFFC with different mix proportions and performed slump expansion, slump, J-ring expansion and mechanical tests. Additionally, this research comprehensively analyzed the SCFFC based on fuzzy mathematics to study its apparent quality and service performance. This research aimed to solve problems such as uneven bubbles and poor bubble diameter in C30 SCFFC, through a combination of defoaming and air entraining by adding defoamer and air-entraining agent according to different proportions for compound treatment. The defoamer dosage was 0.5‰ of that of water reducer, and the air-entraining agent dosage was 0.1‰ of that of cement. The workability and clearance passability of the concrete were optimal. At the same time, the apparent holes in the SCFFC were small, as were their area and quantity. The distribution and apparent color of the SCFFC were uniform. Considering the factors affecting the service performance of concrete and after a comprehensive analysis of the samples’ weights, subjection degree, variability, stability, and strength index, this research found that the ratio for obtaining a C30 SCFFC material with the highest apparent quality and service performance was as follows: cement:machine-made sand:crushed dtone:fly-ash:water = 4:8.6:9.3:1:2.2. The water reducer comprised 1.0% of the total mass of the cementitious materials. The defoamer dosage was 0.5‰ of that of water reducer, and the dosage of air-entraining agent was 0.1‰ of that of cement.https://www.mdpi.com/2075-5309/12/4/479self-compacting fair-faced concrete (SCFFC)apparent qualityservice performancemechanical testfuzzy mathematics |
| spellingShingle | Caijin Xie Tiejun Tao Keyu Huang Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining Buildings self-compacting fair-faced concrete (SCFFC) apparent quality service performance mechanical test fuzzy mathematics |
| title | Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining |
| title_full | Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining |
| title_fullStr | Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining |
| title_full_unstemmed | Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining |
| title_short | Apparent Quality and Service Performance Evaluation of SCFFC in Tunnel Secondary Lining |
| title_sort | apparent quality and service performance evaluation of scffc in tunnel secondary lining |
| topic | self-compacting fair-faced concrete (SCFFC) apparent quality service performance mechanical test fuzzy mathematics |
| url | https://www.mdpi.com/2075-5309/12/4/479 |
| work_keys_str_mv | AT caijinxie apparentqualityandserviceperformanceevaluationofscffcintunnelsecondarylining AT tiejuntao apparentqualityandserviceperformanceevaluationofscffcintunnelsecondarylining AT keyuhuang apparentqualityandserviceperformanceevaluationofscffcintunnelsecondarylining |