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Experimental and numerical investigation of the tensile strength of lightweight concrete including expanded clay aggregate with emphasis on the double punch test
https://orcid.org/http://orcid.org/0000-0001-8280-3867
The present study investigates the tensile strength of lightweight concrete containing lightweight expanded clay aggregate (LECA), focusing on the double punch test. To this end, 15 mixes were prepared in three groups based on three basic mixes of normal-weight concrete with characteristic strengths of 35, 70, and 90 MPa. The LECAs with two different gradations and maximum grain sizes of 12.5 mm and 19 mm were used to replace 50% and 100% of the coarse aggregates in each basic mix. The effects of the maximum size and volume percentages of LECA on the compressive, direct tensile, splitting, and double punch strengths of lightweight concrete were studied. The results indicated that replacing coarse aggregate with LECA can reduce compressive, direct tensile and splitting strengths by 7–49%, 9.6–17.7%, and 9.4–47.3% compared to those of base mixes, respectively. The double punch strength was computed using various equations and compared to the tensile strength determined by other tests. By comparing the double punch strength obtained from conventional cubic and cylindrical specimens, the shape and size effects of specimens on the double punch strength were investigated, and the appropriate conversion factors for employing cubic specimens were determined. Nonlinear regression analyses were performed on data obtained in this study and collected from the literature. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted with determination coefficients of 0.72, 0.75 and 0.97, respectively. Eventually, the reliability of the proposed relationships was measured compared to the empirical relationships recommended by codes or literature based on integral absolute error (IAE). The value of IAE for the relationships proposed to estimate the direct tensile, splitting and double punch strengths were obtained as 5.2%, 10.3% and 2.5%, respectively, indicating the good reliability of these relationships. While the IAE value for the CEB-FIB relationship of direct tensile strength was 45.4%, indicating low reliability, and for the ACI and CEB-FIB relationships of splitting strength, were 11.9% and 10.3%, respectively, which indicated relatively good reliability.
Experimental and numerical investigation of the tensile strength of lightweight concrete including expanded clay aggregate with emphasis on the double punch test
https://orcid.org/http://orcid.org/0000-0001-8280-3867
The present study investigates the tensile strength of lightweight concrete containing lightweight expanded clay aggregate (LECA), focusing on the double punch test. To this end, 15 mixes were prepared in three groups based on three basic mixes of normal-weight concrete with characteristic strengths of 35, 70, and 90 MPa. The LECAs with two different gradations and maximum grain sizes of 12.5 mm and 19 mm were used to replace 50% and 100% of the coarse aggregates in each basic mix. The effects of the maximum size and volume percentages of LECA on the compressive, direct tensile, splitting, and double punch strengths of lightweight concrete were studied. The results indicated that replacing coarse aggregate with LECA can reduce compressive, direct tensile and splitting strengths by 7–49%, 9.6–17.7%, and 9.4–47.3% compared to those of base mixes, respectively. The double punch strength was computed using various equations and compared to the tensile strength determined by other tests. By comparing the double punch strength obtained from conventional cubic and cylindrical specimens, the shape and size effects of specimens on the double punch strength were investigated, and the appropriate conversion factors for employing cubic specimens were determined. Nonlinear regression analyses were performed on data obtained in this study and collected from the literature. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted with determination coefficients of 0.72, 0.75 and 0.97, respectively. Eventually, the reliability of the proposed relationships was measured compared to the empirical relationships recommended by codes or literature based on integral absolute error (IAE). The value of IAE for the relationships proposed to estimate the direct tensile, splitting and double punch strengths were obtained as 5.2%, 10.3% and 2.5%, respectively, indicating the good reliability of these relationships. While the IAE value for the CEB-FIB relationship of direct tensile strength was 45.4%, indicating low reliability, and for the ACI and CEB-FIB relationships of splitting strength, were 11.9% and 10.3%, respectively, which indicated relatively good reliability.
Experimental and numerical investigation of the tensile strength of lightweight concrete including expanded clay aggregate with emphasis on the double punch test
https://orcid.org/http://orcid.org/0000-0001-8280-3867
The present study investigates the tensile strength of lightweight concrete containing lightweight expanded clay aggregate (LECA), focusing on the double punch test. To this end, 15 mixes were prepared in three groups based on three basic mixes of normal-weight concrete with characteristic strengths of 35, 70, and 90 MPa. The LECAs with two different gradations and maximum grain sizes of 12.5 mm and 19 mm were used to replace 50% and 100% of the coarse aggregates in each basic mix. The effects of the maximum size and volume percentages of LECA on the compressive, direct tensile, splitting, and double punch strengths of lightweight concrete were studied. The results indicated that replacing coarse aggregate with LECA can reduce compressive, direct tensile and splitting strengths by 7–49%, 9.6–17.7%, and 9.4–47.3% compared to those of base mixes, respectively. The double punch strength was computed using various equations and compared to the tensile strength determined by other tests. By comparing the double punch strength obtained from conventional cubic and cylindrical specimens, the shape and size effects of specimens on the double punch strength were investigated, and the appropriate conversion factors for employing cubic specimens were determined. Nonlinear regression analyses were performed on data obtained in this study and collected from the literature. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted. Relationships for estimating direct tensile, splitting and double punch strengths of LECA-lightweight concrete based on compressive strength and density were extracted with determination coefficients of 0.72, 0.75 and 0.97, respectively. Eventually, the reliability of the proposed relationships was measured compared to the empirical relationships recommended by codes or literature based on integral absolute error (IAE). The value of IAE for the relationships proposed to estimate the direct tensile, splitting and double punch strengths were obtained as 5.2%, 10.3% and 2.5%, respectively, indicating the good reliability of these relationships. While the IAE value for the CEB-FIB relationship of direct tensile strength was 45.4%, indicating low reliability, and for the ACI and CEB-FIB relationships of splitting strength, were 11.9% and 10.3%, respectively, which indicated relatively good reliability.
Experimental and numerical investigation of the tensile strength of lightweight concrete including expanded clay aggregate with emphasis on the double punch test
Mater Struct
Sadrinejad, Iman (Autor:in) / Miar Naimi, Mehr Ali (Autor:in) / Saradar, Ashkan (Autor:in) / Mansouri Sarvandani, Morteza (Autor:in) / Karakouzian, Moses (Autor:in)
01.04.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Lightweight concrete , Tensile strength , Double punch test , The relationship between tensile and compressive strengths , Lightweight expanded clay aggregate Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
Tests on direct tensile characteristics of expanded clay lightweight aggregate concrete
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Lightweight Expanded Clay Aggregate Foam Concrete; Investigation, Production, Construction
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