The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout
In this study, ultra-fine spherical particles of silica fume and reactive ultra-fine fly ash were added to a mixture of commercial ultra-high-performance grout (UHPG) with the aim of enhancing the rheological properties, compressive strength, compactness, and permeability. This commercial UHPG study...
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MDPI AG
2021-08-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/9/1040 |
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| author | Wei-Ting Lin Wen-Que Zhao Yi-Hua Chang Jiann-Shi Yang An Cheng |
| author_facet | Wei-Ting Lin Wen-Que Zhao Yi-Hua Chang Jiann-Shi Yang An Cheng |
| author_sort | Wei-Ting Lin |
| collection | DOAJ |
| description | In this study, ultra-fine spherical particles of silica fume and reactive ultra-fine fly ash were added to a mixture of commercial ultra-high-performance grout (UHPG) with the aim of enhancing the rheological properties, compressive strength, compactness, and permeability. This commercial UHPG study was conducted in collaboration with Triaxis Corporation (Changsha city, Hunan province, China). A water-to-binder ratio of 0.21 and a binder-to-fine aggregates ratio of 1.17 were used as fixed parameters, and the binders were a combination of type-II Portland cement, sulphoaluminate cement, silica fume, and reactive ultra-fine fly ash (RUFA). Polycarboxylate superplasticizer powder was used to control the rheology. The results revealed excellent compressive strength, volume stability, and resistance to chloride penetration. Mercury intrusion porosimetry and scanning electron microscopy tests revealed that the medium-sized RUFA particles with small silica fume particles completely filled the spaces between large cement particles to achieve optimal densification. This mixture also produced dense hydration and calcium-silicate-hydrates colloids, which filled the microstructures of the UHPG resulting in excellent engineering properties and durability. This commercially available UHPG mix responded to excellent compressive strengths approaching 120 MPa and exhibited good workability with a loss of slump-flow rate up to 33% after 60 min. It also exhibited very low abrasion resistance (0.5%), stable shrinkage and expansion rates (stabilization over 10 days), very low chloride diffusion coefficient (less than 0.1 × 10<sup>−14</sup> m<sup>2</sup>/s) with a denser microstructure. This commercial UHPG (UHPG-120) has been developed to meet the needs of the market. |
| first_indexed | 2024-03-10T07:47:53Z |
| format | Article |
| id | doaj.art-e78ba8d1904a46f8882eb14791de2ac4 |
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| language | English |
| last_indexed | 2024-03-10T07:47:53Z |
| publishDate | 2021-08-01 |
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| series | Crystals |
| spelling | doaj.art-e78ba8d1904a46f8882eb14791de2ac42023-11-22T12:34:57ZengMDPI AGCrystals2073-43522021-08-01119104010.3390/cryst11091040The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance GroutWei-Ting Lin0Wen-Que Zhao1Yi-Hua Chang2Jiann-Shi Yang3An Cheng4Department of Civil Engineering, National Ilan University, No. 1, Sec. 1, Shennong Rd., Yilan City 260, Yilan County, TaiwanDepartment of Civil Engineering, National Ilan University, No. 1, Sec. 1, Shennong Rd., Yilan City 260, Yilan County, TaiwanDepartment of Civil Engineering, National Ilan University, No. 1, Sec. 1, Shennong Rd., Yilan City 260, Yilan County, TaiwanTriaxis Corporation, 19F, Jinlu Business Building, No. 311, Yuelu Rd., Changsha 410031, ChinaDepartment of Civil Engineering, National Ilan University, No. 1, Sec. 1, Shennong Rd., Yilan City 260, Yilan County, TaiwanIn this study, ultra-fine spherical particles of silica fume and reactive ultra-fine fly ash were added to a mixture of commercial ultra-high-performance grout (UHPG) with the aim of enhancing the rheological properties, compressive strength, compactness, and permeability. This commercial UHPG study was conducted in collaboration with Triaxis Corporation (Changsha city, Hunan province, China). A water-to-binder ratio of 0.21 and a binder-to-fine aggregates ratio of 1.17 were used as fixed parameters, and the binders were a combination of type-II Portland cement, sulphoaluminate cement, silica fume, and reactive ultra-fine fly ash (RUFA). Polycarboxylate superplasticizer powder was used to control the rheology. The results revealed excellent compressive strength, volume stability, and resistance to chloride penetration. Mercury intrusion porosimetry and scanning electron microscopy tests revealed that the medium-sized RUFA particles with small silica fume particles completely filled the spaces between large cement particles to achieve optimal densification. This mixture also produced dense hydration and calcium-silicate-hydrates colloids, which filled the microstructures of the UHPG resulting in excellent engineering properties and durability. This commercially available UHPG mix responded to excellent compressive strengths approaching 120 MPa and exhibited good workability with a loss of slump-flow rate up to 33% after 60 min. It also exhibited very low abrasion resistance (0.5%), stable shrinkage and expansion rates (stabilization over 10 days), very low chloride diffusion coefficient (less than 0.1 × 10<sup>−14</sup> m<sup>2</sup>/s) with a denser microstructure. This commercial UHPG (UHPG-120) has been developed to meet the needs of the market.https://www.mdpi.com/2073-4352/11/9/1040silica fumereactive ultra-fine fly ashchloride diffusion coefficientmicroscopic propertiescement-based grout |
| spellingShingle | Wei-Ting Lin Wen-Que Zhao Yi-Hua Chang Jiann-Shi Yang An Cheng The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout Crystals silica fume reactive ultra-fine fly ash chloride diffusion coefficient microscopic properties cement-based grout |
| title | The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout |
| title_full | The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout |
| title_fullStr | The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout |
| title_full_unstemmed | The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout |
| title_short | The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout |
| title_sort | effect of incorporating ultra fine spherical particles on rheology and engineering properties of commercial ultra high performance grout |
| topic | silica fume reactive ultra-fine fly ash chloride diffusion coefficient microscopic properties cement-based grout |
| url | https://www.mdpi.com/2073-4352/11/9/1040 |
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