Experimental study on special strength curve of rebound method for concrete evaluation of high-titanium slag concrete

Wang Jie; Liang Yuehua; Cai Run; Li Ji

doi:10.7513/j.issn.1004-7638.2023.02.017

Volume 44 Issue 2

Apr. 2023

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Wang Jie, Liang Yuehua, Cai Run, Li Ji. Experimental study on special strength curve of rebound method for concrete evaluation of high-titanium slag concrete[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(2): 118-123. doi: 10.7513/j.issn.1004-7638.2023.02.017

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Wang Jie, Liang Yuehua, Cai Run, Li Ji. Experimental study on special strength curve of rebound method for concrete evaluation of high-titanium slag concrete[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(2): 118-123. doi: 10.7513/j.issn.1004-7638.2023.02.017

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Experimental study on special strength curve of rebound method for concrete evaluation of high-titanium slag concrete

doi: 10.7513/j.issn.1004-7638.2023.02.017

Wang Jie^1
,,
Liang Yuehua^{1
,
,},
Cai Run²,
Li Ji³

1.
College of Civil and Architectural Engineering, Panzhihua University, Panzhihua 617000, Sichuan, China
2.
Chengdu Surveying Geotechnical Research Institute Co., Ltd., MCC , Chengdu 610063, Sichuan, China
3.
China 19^th Metallurgical Group Co., Ltd., Panzhihua 617000, Sichuan, China

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Received Date: 2022-12-06
Publish Date: 2023-04-30

Abstract

Abstract

Under the background of “achieving peak carbon dioxide emission and carbon neutrality,” high-titanium furnace slag is widely used as coarse and fine aggregate to prepare concrete in Panzhihua city of China. The purpose of this paper is to improve the accuracy of strength detection of high titanium slag concrete by springback method. Coarse and fine aggregates of high-titanium blast furnace slag are used to make high-titanium blast furnace slag concrete cubic blocks with strength grade of C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70 and side length of 150 mm. Saturated with water for 7 days and then naturally cured for 21 days, then these test blocks were put into the indoor accelerated carbonization box to accelerate carbonization for 0 days, 3 days, 7 days, 14 days and 28 days, respectively, and the rebound-compression-carbonization depth tests are carried out. According to “Technical Specification for Inspecting of Concrete Compressive Strength by Rebound Method” (JGJ/T23-2011), this paper compares the presumed concrete strength value and the actual compressive strength to analyze the relationship between the rebound value, carbonation depth and the actual compressive strength value, the rebound strength of concrete measured by direct use of the “Rules” is generally lower than the actual compressive strength, the difference is large, the result is too conservative. On the basis of the values measured in the above-mentioned “Specification,” 10 MPa is added for the rapid determination of the springback strength of high-titanium furnace slag concrete with a precision higher than that of the “Specification.” In this paper, based on the relationship between rebound value, actual strength and carbonization degree correction, we established the regional strength curve of high-titanium blast furnace slag concrete compressive strength of Panxi area with higher accuracy by using the least square method fitting $f_{cu,i}^c = {\text{0}}{\text{.380 3}}R_{\text{m}}^{{\text{1}}{\text{.362 7}}} \cdot {\text{1}}{{\text{0}}^{-{\text{( 0}}{\text{.008 3}}{{{d}}_{\text{m}}}{\text{)}}}}$.
- high titanium blast furnace slag concrete,
- compressive strength,
- carbonation depth,
- rebound method,
- regional strength curve

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References(21)

References

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