Experimental Study on Autogenous and Drying Shrinkage of Steel Fiber Reinforced Lightweight-Aggregate Concrete

Zhao, Shunbo; Li, Changyong; Zhao, Mingshuang; Zhang, Xiaoyan

doi:10.1155/2016/2589383

Cited by 32 publications

(23 citation statements)

References 26 publications

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“…The test results of autogenous shrinkage of specimens are exhibited in Table 6 and Figure 6, and the growth of expansive deformation is displayed in Figure 7, of which the negative and positive values of Y-axis are the expansive and shrinkage deformation, respectively. In general, the autogenous shrinkage grew rapidly within the first month and then developed slowly and tended to be steady [11,20,45]. The SCC had a highest autogenous shrinkage due to no expansive agent admixed, and the SF0 had a lowest autogenous shrinkage due to the free development of expansive deformation.…”

Section: Autogenous Shrinkage Of Hardened Self-compacting Sfrcmentioning

confidence: 94%

“…The test results of drying shrinkage of specimens are exhibited in Table 7 and Figure 8. After the commencement of drying, the shrinkage rate developed rapidly and more than 50% of shrinkage happened within the first month [8][9][10]12,45]. The drying shrinkage at 180 d of SF0 decreased 20.3% compared with SCC due to the compensation effect of expansive agent.…”

Section: Drying Shrinkage Of Hardened Self-compacting Sfrcmentioning

confidence: 98%

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Shrinkage and Mechanical Properties of Self-Compacting SFRC With Calcium-Sulfoaluminate Expansive Agent

Shang

et al. 2020

Materials

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With the premise of ensuring workability on a fresh mixture, the volume stability of hardened self-compacting steel fiber reinforced concrete (SFRC) becomes an issue due to the content of cementitious materials increased with the volume fraction of steel fiber. By using the expansive agent to reduce the shrinkage deformation of self-compacting SFRC, the strength reduction of hardened self-compacting SFRC is another issue. To solve these issues, this paper performed an experimental investigation on the workability, shrinkage, and mechanical properties of self-compacting SFRC compared to the self-compacting concrete (SCC) with or without an expansive agent. The calcium-sulfoaluminate expansive agent with content optimized to be 10% mass of binders and the steel fiber with a varying volume fraction from 0.4% to 1.2% were selected as the main parameters. The mix proportion of self-compacting SFRC with expansive agent was designed by the direct absolute volume method, of which the steel fibers are considered to be the distributed coarse aggregates. Results showed that rational high filling and passing ability of fresh self-compacting SFRC was ensured by increasing the binder to coarse-aggregate ratio and the sand ratio in the mix proportions; the autogenous and drying shrinkages of hardened self-compacting SFRC reduced by 22.2% to 3.2% and by 18.5% to 7.3% compared to those of the SCC without expansive agent at a curing age of 180 d, although the expansion effect of expansive agent decreased with the increasing volume fraction of steel fiber; the mechanical properties, including the compressive strength, the splitting tensile strength, and the modulus of elasticity increased with the incorporation of an expansive agent and steel fibers, which met the design requirements.

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Section: Autogenous Shrinkage Of Hardened Self-compacting Sfrcmentioning

confidence: 94%

Section: Drying Shrinkage Of Hardened Self-compacting Sfrcmentioning

confidence: 98%

Shrinkage and Mechanical Properties of Self-Compacting SFRC With Calcium-Sulfoaluminate Expansive Agent

Shang

et al. 2020

Materials

Self Cite

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“…The reasons of that could be described as follows: the addition of SRA decreases the surface tension of the pore solution, thereby decreasing the Laplace pressure in the capillary pore solution, which could decrease the autogenous shrinkage of pastes. Additionally, the autogenous shrinkage is reduced through internal curing [30] with the use of SCA. What is more, the SRA and SCA will play an effective role together for the shrinkage reduction and will not counteract the effect of each other in decreasing the shrinkage.…”

Section: 33mentioning

confidence: 99%

Effectiveness of Saturated Coral Aggregate and Shrinkage Reducing Admixture on the Autogenous Shrinkage of Ultrahigh Performance Concrete

Chen

et al. 2017

Advances in Materials Science and Engineering

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The use of saturated coral aggregate (SCA) as practical replacement of quartz sand has been shown to effectively mitigate the autogenous shrinkage in ultrahigh performance concrete (UHPC). The autogenous deformation, the compressive strength, the flexural strength, and the hydration property development of paste with different shrinkage means were tested. Three different methods were evaluated to mitigate the autogenous shrinkage: SCA, shrinkage reducing admixture (SRA), and the mixture of SCA and SRA (SRA-SCA). It was found that SCA and SRA have all the effective ways to reduce the shrinkage deformation, and SRA-SCA was the most effective in mitigating the shrinkage. The autogenous shrinkage of UHPC was restrained, when the SCA dosage was 44%, the SRA dosage was 0.8%, the SCA content was 26%, the SRA dosage was 2.4%, the SCA content was 18%, the SRA content was 2.4%, or the SCA dosage was 26%. The mechanical properties were deteriorated by the addition of SCA, while the compressive strength was still higher than 90 MPa at 28 days even though the replacement ratio of SCA was up to 50%. Furthermore, internal curing by means of SCA was proved to be a successful way to mitigate autogenous shrinkage, after the tests.

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“…Various short fibers are often used to reduce the brittleness of concrete [9]. Some researchers have proved that steel fibers impart good strengthening, toughening, and crack resistance to both NC and LAC materials, and such steel fiber reinforced concrete would have a direct effect on the deformation and seismic performance of the whole structure [10][11][12][13][14][15][16][17][18]. In practical application, with the increase of fiber content, the dispersion of steel fiber will become more and more difficult, increasing the bulk density of materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of High‐Strength Steel Fiber Lightweight Aggregate Concrete on Mechanical Properties and Toughness Index

Liu

Zhang³

et al. 2020

Advances in Materials Science and Engineering

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In this paper, three different kinds of steel fibers, being micro (M), end-hooked (H), and corrugated (C), commonly used in engineering applications, are added to high-strength lightweight aggregate concrete (HLAC) to study the effects of steel fiber and volume content ratio of fiber on the compressive, splitting tensile, and flexural strength of HLAC. The range of steel fiber volume content fraction studied is 0.5% to 2.0%. The research shows that different types of steel fiber have different effects on the mechanical properties and toughness of HLAC. M steel fibers have the best reinforcing performance on the mechanical properties. The study also shows that the toughness of M steel fibers is the best with the same fiber content. The toughening effect of H and C steel fibers can only reach 2/3 and 1/2 of M steel fibers, respectively. At the end of this paper, the unified strength formula and toughness index of these three kinds of high-strength steel fiber lightweight aggregate concrete (HSLAC) with different fiber contents are given to provide a reference for engineering practice and design.

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Experimental Study on Autogenous and Drying Shrinkage of Steel Fiber Reinforced Lightweight-Aggregate Concrete

Cited by 32 publications

References 26 publications

Shrinkage and Mechanical Properties of Self-Compacting SFRC With Calcium-Sulfoaluminate Expansive Agent

Shrinkage and Mechanical Properties of Self-Compacting SFRC With Calcium-Sulfoaluminate Expansive Agent

Effectiveness of Saturated Coral Aggregate and Shrinkage Reducing Admixture on the Autogenous Shrinkage of Ultrahigh Performance Concrete

Experimental Study of High‐Strength Steel Fiber Lightweight Aggregate Concrete on Mechanical Properties and Toughness Index

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