Influence of formwork wall effect on fiber orientation of UHPC with two casting methods
This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork we...
Ausführliche Beschreibung
Autor*in: |
Huang, Huanghuang [verfasserIn] Su, Anshuang [verfasserIn] Gao, Xiaojian [verfasserIn] Yang, Yingzi [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2019 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Construction and building materials - Amsterdam [u.a.] : Elsevier Science, 1987, 215, Seite 310-320 |
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Übergeordnetes Werk: |
volume:215 ; pages:310-320 |
DOI / URN: |
10.1016/j.conbuildmat.2019.04.200 |
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Katalog-ID: |
ELV002387239 |
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520 | |a This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. | ||
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700 | 1 | |a Yang, Yingzi |e verfasserin |4 aut | |
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10.1016/j.conbuildmat.2019.04.200 doi (DE-627)ELV002387239 (ELSEVIER)S0950-0618(19)31089-X DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Huang, Huanghuang verfasserin aut Influence of formwork wall effect on fiber orientation of UHPC with two casting methods 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. UHPC Fiber orientation Flexural properties Formwork Flow control Su, Anshuang verfasserin aut Gao, Xiaojian verfasserin (orcid)0000-0003-3138-5751 aut Yang, Yingzi verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 215, Seite 310-320 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:215 pages:310-320 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 215 310-320 |
spelling |
10.1016/j.conbuildmat.2019.04.200 doi (DE-627)ELV002387239 (ELSEVIER)S0950-0618(19)31089-X DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Huang, Huanghuang verfasserin aut Influence of formwork wall effect on fiber orientation of UHPC with two casting methods 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. UHPC Fiber orientation Flexural properties Formwork Flow control Su, Anshuang verfasserin aut Gao, Xiaojian verfasserin (orcid)0000-0003-3138-5751 aut Yang, Yingzi verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 215, Seite 310-320 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:215 pages:310-320 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 215 310-320 |
allfields_unstemmed |
10.1016/j.conbuildmat.2019.04.200 doi (DE-627)ELV002387239 (ELSEVIER)S0950-0618(19)31089-X DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Huang, Huanghuang verfasserin aut Influence of formwork wall effect on fiber orientation of UHPC with two casting methods 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. UHPC Fiber orientation Flexural properties Formwork Flow control Su, Anshuang verfasserin aut Gao, Xiaojian verfasserin (orcid)0000-0003-3138-5751 aut Yang, Yingzi verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 215, Seite 310-320 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:215 pages:310-320 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 215 310-320 |
allfieldsGer |
10.1016/j.conbuildmat.2019.04.200 doi (DE-627)ELV002387239 (ELSEVIER)S0950-0618(19)31089-X DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Huang, Huanghuang verfasserin aut Influence of formwork wall effect on fiber orientation of UHPC with two casting methods 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. UHPC Fiber orientation Flexural properties Formwork Flow control Su, Anshuang verfasserin aut Gao, Xiaojian verfasserin (orcid)0000-0003-3138-5751 aut Yang, Yingzi verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 215, Seite 310-320 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:215 pages:310-320 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 215 310-320 |
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10.1016/j.conbuildmat.2019.04.200 doi (DE-627)ELV002387239 (ELSEVIER)S0950-0618(19)31089-X DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Huang, Huanghuang verfasserin aut Influence of formwork wall effect on fiber orientation of UHPC with two casting methods 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. UHPC Fiber orientation Flexural properties Formwork Flow control Su, Anshuang verfasserin aut Gao, Xiaojian verfasserin (orcid)0000-0003-3138-5751 aut Yang, Yingzi verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 215, Seite 310-320 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:215 pages:310-320 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 215 310-320 |
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Influence of formwork wall effect on fiber orientation of UHPC with two casting methods |
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Influence of formwork wall effect on fiber orientation of UHPC with two casting methods |
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influence of formwork wall effect on fiber orientation of uhpc with two casting methods |
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Influence of formwork wall effect on fiber orientation of UHPC with two casting methods |
abstract |
This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. |
abstractGer |
This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. |
abstract_unstemmed |
This paper investigated influence of formwork wall effect on fiber orientation and flexural properties (flexural strength and toughness) of ultra-high performance concrete (UHPC) prepared by a direct cast and flow control method. Fiber orientations in samples with different distance from formwork were quantitatively evaluated using image analysis technique. Based on experimental results, the better fiber orientation and higher flexural performance can be obtained near formwork boundaries due to restriction effect on fiber rotation. Considerable variations of flexural strength and toughness with position were induced by the existence of mold sidewalls for directly cast UHPC specimens, reaching up to 54.9% and 49.6%, respectively. This is related to the significant fiber orientation coefficient variation of 21.1%–30.3%. When adopting the flow control method, the variability of fiber orientation coefficient was decreased to the range of 6.0%–12.3%, inducing the reduction of flexural strength and toughness differential to lower than 19.5% and 18.6%. Therefore, the flow control casting method can significantly inhibit the wall effect of formwork and is favorable for improving the homogeneity of UHPC in real structures. |
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title_short |
Influence of formwork wall effect on fiber orientation of UHPC with two casting methods |
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