An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder
The effects of dolomite powder on the freeze–thaw resistance of C30 and C45 concrete were investigated in this manuscript. Scanning electron microscopy (SEM), the electric flux method, and a freeze–thaw cycle testing machine were used to determine the morphology, chloride penetration resistance, mas...
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MDPI AG
2022-02-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/5/1721 |
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| author | Xin Zhang Yu Luo Wu Yao |
| author_facet | Xin Zhang Yu Luo Wu Yao |
| author_sort | Xin Zhang |
| collection | DOAJ |
| description | The effects of dolomite powder on the freeze–thaw resistance of C30 and C45 concrete were investigated in this manuscript. Scanning electron microscopy (SEM), the electric flux method, and a freeze–thaw cycle testing machine were used to determine the morphology, chloride penetration resistance, mass loss rate, and relative dynamic elastic modulus (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula>) of concrete incorporating dolomite powder. Concrete’s freeze–thaw resistance improved as the dosage of dolomite powder was increased. After 300 cycles, the mass loss rates of reference specimens of C30 and C45 concrete were 6.71% and 0.14%, respectively, whereas the mass loss rates of C30 and C45 concrete in the presence of dolomite powder at a 50% replacement level were 5.81% and 0.13%, respectively. After 225 cycles, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula> of C30 concrete was 42.57% and 48.56% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Meanwhile, after 300 cycles, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula> of C45 concrete was 67.54% and 71.50% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Accordingly, the structure of dolomite-containing cement-based materials became more compact. Based on the Weibull distribution, a damage model for concrete containing dolomite powder was proposed. It established that concrete treated with dolomite powder had a lower degree of damage than reference specimens when subjected to the same freeze–thaw conditions. |
| first_indexed | 2024-03-09T20:33:29Z |
| format | Article |
| id | doaj.art-d5232af5790e492cae107e3065162bb3 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T20:33:29Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-d5232af5790e492cae107e3065162bb32023-11-23T23:17:50ZengMDPI AGMaterials1996-19442022-02-01155172110.3390/ma15051721An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite PowderXin Zhang0Yu Luo1Wu Yao2Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 201804, ChinaQianxinan Urban Construction Investment Co., Ltd., Guizhou 562400, ChinaKey Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 201804, ChinaThe effects of dolomite powder on the freeze–thaw resistance of C30 and C45 concrete were investigated in this manuscript. Scanning electron microscopy (SEM), the electric flux method, and a freeze–thaw cycle testing machine were used to determine the morphology, chloride penetration resistance, mass loss rate, and relative dynamic elastic modulus (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula>) of concrete incorporating dolomite powder. Concrete’s freeze–thaw resistance improved as the dosage of dolomite powder was increased. After 300 cycles, the mass loss rates of reference specimens of C30 and C45 concrete were 6.71% and 0.14%, respectively, whereas the mass loss rates of C30 and C45 concrete in the presence of dolomite powder at a 50% replacement level were 5.81% and 0.13%, respectively. After 225 cycles, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula> of C30 concrete was 42.57% and 48.56% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Meanwhile, after 300 cycles, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>r</mi></msub></mrow></semantics></math></inline-formula> of C45 concrete was 67.54% and 71.50% in the case of dolomite powder at 0 and 50% replacement levels, respectively. Accordingly, the structure of dolomite-containing cement-based materials became more compact. Based on the Weibull distribution, a damage model for concrete containing dolomite powder was proposed. It established that concrete treated with dolomite powder had a lower degree of damage than reference specimens when subjected to the same freeze–thaw conditions.https://www.mdpi.com/1996-1944/15/5/1721concretesdolomite powderpore structurefreeze–thaw cycleWeibull distribution |
| spellingShingle | Xin Zhang Yu Luo Wu Yao An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder Materials concretes dolomite powder pore structure freeze–thaw cycle Weibull distribution |
| title | An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder |
| title_full | An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder |
| title_fullStr | An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder |
| title_full_unstemmed | An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder |
| title_short | An Innovative Material with Strong Frost Resistance—Concrete Containing Dolomite Powder |
| title_sort | innovative material with strong frost resistance concrete containing dolomite powder |
| topic | concretes dolomite powder pore structure freeze–thaw cycle Weibull distribution |
| url | https://www.mdpi.com/1996-1944/15/5/1721 |
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