Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities
Controlled low-strength materials (CLSMs) have been developed using various byproducts for backfilling or void-filling around pipelines or culvert boxes. However, these CLSMs have encountered issues related to their inadequate placement around underground facilities, despite satisfying the performan...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-08-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/13/16/9377 |
| _version_ | 1797585612016975872 |
|---|---|
| author | Jingyu Han Youngseok Jo Yunhee Kim Bumjoo Kim |
| author_facet | Jingyu Han Youngseok Jo Yunhee Kim Bumjoo Kim |
| author_sort | Jingyu Han |
| collection | DOAJ |
| description | Controlled low-strength materials (CLSMs) have been developed using various byproducts for backfilling or void-filling around pipelines or culvert boxes. However, these CLSMs have encountered issues related to their inadequate placement around underground facilities, despite satisfying the performance requirements, especially flowability, recommended by the American Concrete Institute (ACI) 229 committee. In this study, a new CLSM is developed to ensure a significantly higher flowability, lower segregation, and faster installation compared with previously developed CLSMs. This is achieved through a series of laboratory tests. To enhance the flowability and prevent segregation, a calcium-sulfoaluminate-based binder and fly ash are used in combination with two types of additives. The measured flowability of the new CLSM is 700 mm, while its compressive strength and bleeding satisfy the general criteria specified by the ACI 229R-13. In addition, the performance of the developed CLSM is compared with that of predeveloped CLSMs. The new CLSM was not only shown to exhibit the highest flowability, but also to satisfy the specified requirements for compressive strength and bleeding. Overall, it is anticipated that the developed CLSM can significantly reduce the costs related to the disposal of old pavements, the installation of new pavements, and other construction expenses compared to the costs related to the conventional method, even though the expenses for the backfill materials could increase due to the higher production costs of CLSMs than soil. In addition, there is a need to investigate its field applicability in order to evaluate the precise costs, maintenance, and long-term stabilities after installation. |
| first_indexed | 2024-03-11T00:08:24Z |
| format | Article |
| id | doaj.art-60c0a71d841348ffacc5ec42f6142c4b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T00:08:24Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-60c0a71d841348ffacc5ec42f6142c4b2023-11-19T00:08:49ZengMDPI AGApplied Sciences2076-34172023-08-011316937710.3390/app13169377Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan CitiesJingyu Han0Youngseok Jo1Yunhee Kim2Bumjoo Kim3Department of R&D, Chemius Korea Co., Ltd., Suncheon 57942, Republic of KoreaDepartment of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USADepartment of Civil and Environmental Engineering, Dongguk University, Seoul 04620, Republic of KoreaDepartment of Civil and Environmental Engineering, Dongguk University, Seoul 04620, Republic of KoreaControlled low-strength materials (CLSMs) have been developed using various byproducts for backfilling or void-filling around pipelines or culvert boxes. However, these CLSMs have encountered issues related to their inadequate placement around underground facilities, despite satisfying the performance requirements, especially flowability, recommended by the American Concrete Institute (ACI) 229 committee. In this study, a new CLSM is developed to ensure a significantly higher flowability, lower segregation, and faster installation compared with previously developed CLSMs. This is achieved through a series of laboratory tests. To enhance the flowability and prevent segregation, a calcium-sulfoaluminate-based binder and fly ash are used in combination with two types of additives. The measured flowability of the new CLSM is 700 mm, while its compressive strength and bleeding satisfy the general criteria specified by the ACI 229R-13. In addition, the performance of the developed CLSM is compared with that of predeveloped CLSMs. The new CLSM was not only shown to exhibit the highest flowability, but also to satisfy the specified requirements for compressive strength and bleeding. Overall, it is anticipated that the developed CLSM can significantly reduce the costs related to the disposal of old pavements, the installation of new pavements, and other construction expenses compared to the costs related to the conventional method, even though the expenses for the backfill materials could increase due to the higher production costs of CLSMs than soil. In addition, there is a need to investigate its field applicability in order to evaluate the precise costs, maintenance, and long-term stabilities after installation.https://www.mdpi.com/2076-3417/13/16/9377controlled low-strength materialhigh flowabilitybackfillingfly ashcalcium-sulfoaluminate-based binder |
| spellingShingle | Jingyu Han Youngseok Jo Yunhee Kim Bumjoo Kim Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities Applied Sciences controlled low-strength material high flowability backfilling fly ash calcium-sulfoaluminate-based binder |
| title | Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities |
| title_full | Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities |
| title_fullStr | Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities |
| title_full_unstemmed | Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities |
| title_short | Development of High-Performance Fly-Ash-Based Controlled Low-Strength Materials for Backfilling in Metropolitan Cities |
| title_sort | development of high performance fly ash based controlled low strength materials for backfilling in metropolitan cities |
| topic | controlled low-strength material high flowability backfilling fly ash calcium-sulfoaluminate-based binder |
| url | https://www.mdpi.com/2076-3417/13/16/9377 |
| work_keys_str_mv | AT jingyuhan developmentofhighperformanceflyashbasedcontrolledlowstrengthmaterialsforbackfillinginmetropolitancities AT youngseokjo developmentofhighperformanceflyashbasedcontrolledlowstrengthmaterialsforbackfillinginmetropolitancities AT yunheekim developmentofhighperformanceflyashbasedcontrolledlowstrengthmaterialsforbackfillinginmetropolitancities AT bumjookim developmentofhighperformanceflyashbasedcontrolledlowstrengthmaterialsforbackfillinginmetropolitancities |