Mechanical and durability properties of sustainable self-compacting concrete with recycled concrete aggregate and fly ash, slag and silica fume

Guo, Zhanggen; Tao, Jianguo; Zhang, Jing; Kong, Xiangkun; Chen, Chen; Lehman, Dawn E.

doi:10.1016/j.conbuildmat.2019.117115

Cited by 192 publications

(59 citation statements)

References 38 publications

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“…On the other hand, because silica fume has strong pozzolanic activity, it can quickly react with Ca(OH) 2 produced by cement hydration to form C-S-H gel. C-S-H gel can improve the pore structure and make the microstructure of SCC more compact [29], thus improved the compressive strength. In summary, SFSCC20 achieved the best FA substitution rate, its strength and stability were better than other SCC with FA and SCC with FA and SF, the compressive strength of 72.95 MPa, 79.13 MPa and 87.59 MPa were obtained at 28 days, 56 days and 91 days respectively.…”

Section: Compressive Strengthmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Yin

Yan

et al. 2020

Materials

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To explore the influence of fly ash (FA) and silica fume (SF) on the mechanical properties of self-compacting concrete (SCC) under uniaxial and triaxial, the compressive strength test, splitting strength test, ultrasonic testing test, and triaxial test were performed in this paper. The results show that the 3 days compressive strength and splitting strength of SCC decreased with the increase of FA substitution rate. The 28 days, 56 days, and 91 days compressive strength and splitting strength of SCC increased first and then decreased with the increase of FA substitution rate. The peak stress and peak strain of SCC gradually increased with the increase of confining pressure. The peak stress and strain of SCC increased first and then decreased with the increase of FA substitution rate. Moreover, the relationship models between compressive strength and splitting strength, between compressive strength and amplitude, between peak stress, peak strain and confining pressure under different FA substitution rates were proposed. As a conclusion, the addition of SF can increase the strength of SCC obviously. Under uniaxial stress, SCC failure mode is splitting failure, under triaxial stress, SCC failure mode is shear failure. Based on the Mohr-Coulomb strength theory, the failure criterion of SCC with FA and SF was discussed.

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Section: Compressive Strengthmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Yin

Yan

et al. 2020

Materials

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“…In order to macroscopically analyze the creep characteristics of the recycled CDW embankment filler, the creep compliance J(t) of the improved Burgers model is used, as shown in the following Equation (14). The creep deformation of CDW fillers in saturated state has already reached the stable standard at 7200 h, selecting t 0 as 7200 h and substituting the fitting creep parameters into Equation (14), the value of equivalent creep compliance J(t 0 ) is obtained, which is a comprehensive indicator of the creep parameters under different ratios and loads.…”

Section: Influencing Factors Of Creep Parametersmentioning

confidence: 99%

“…The improved Burgers model, which can better describe the creep characteristics of CDW filler, and the effects of load and ratio on the creep parameters are analyzed using the equivalent creep compliance. This study is of great significance for the promotion of CDW and meets the requirements of sustainable development.Sustainability 2020, 12, 1924 2 of 22 for the adverse effects of recycled aggregates [12][13][14]. When recycled aggregate is used to produce recycled asphalt, Subhy et al [15] and Menegusso et al [16] have studied the effects of its content and treatment method on fatigue performance.…”

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confidence: 99%

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Investigation into Creep Characteristics and Model of Recycled Construction and Demolition Waste Used in Embankment Filler

Yan

Liu

et al. 2020

Sustainability

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The creep deformation of recycled construction and demolition waste (CDW) filler is an important factor affecting road performance. In this paper, a series of laboratory tests, including a compaction test, sieving test, California bearing ratio (CBR) test, creep test and unloading test are conducted on CDW filler. The engineering properties of different ratios of CDW mixture are systematically analyzed, the CBR value of CDW filler meets the requirements of an embankment. The creep type of CDW filler under a test load is stable creep, the results of the creep characteristics are analyzed from a microscopic point of view. The filler with a 7:2:1 ratio (brick slag: concrete: mortar) has the densest structure, which is dense and less porous, and the deformation is the smallest. Reasonable proportion control is the key to reducing embankment deformation. The improved Burgers model, which can better describe the creep characteristics of CDW filler, and the effects of load and ratio on the creep parameters are analyzed using the equivalent creep compliance. This study is of great significance for the promotion of CDW and meets the requirements of sustainable development.Sustainability 2020, 12, 1924 2 of 22 for the adverse effects of recycled aggregates [12][13][14]. When recycled aggregate is used to produce recycled asphalt, Subhy et al. [15] and Menegusso et al. [16] have studied the effects of its content and treatment method on fatigue performance. In addition, recycled aggregates are used for roadbed fillers, Javier et al. [17] found that the bearing capacity of the recycled aggregates increased with time in the structural layer, which is inconsistent with the trend of natural aggregates. Vegas et al. [18] and Yin et al. [19] studied the properties of recycled concrete applied to an embankment and introduced its permanent deformation characteristics.The application of CDW materials to embankments has great economic and environmental benefits, but the composition of recycled CDW material is complex, and its settlement after construction is difficult to predict and control, therefore, a study into its creep characteristics and mechanisms is urgently needed. The CDW mixture belongs to coarse-grained materials and the creep deformation of coarse-grained materials can be divided into stable creep and unstable creep types, according to the magnitude of stress [20,21]. The rheological curve of coarse-grained materials can be divided into three stages: linear, decaying rheology, and stability [22]. With the increase in dam height, the particle breakage of the rockfill in the rock dam increased significantly, and the particle breakage directly changed the rockfill structure [23,24]. From their triaxial creep shear test, Jiang et al. concluded that particle motion, rotation, and damage are the main causes of coarse-grained material deformation [25]. In addition to the time-dependent strain under a constant load, changes in the external environment tend to have a large effect on creep deformation, especially as immersion i...

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“…In addition, studies have also reported about the use of different slags in self-compacting concrete (SCC). A few application involved the production of SCC using, stainless slag [24], granular steel slag [25], and granulated blast furnace slag [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Fresh properties of self-compacting concrete incorporating electric arc furnace oxidizing slag (EAFOS) as coarse aggregate

Murthi¹,

Poongodi²,

Awoyera

et al. 2020

SN Appl. Sci.

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This study investigates the fresh properties of self-compacting concrete incorporating electric arc furnace oxidizing slag as coarse aggregate. A binary blend of 30% fly ash and cement was utilized as binder to improve the performance of concrete in its fresh state. Concrete grades M20, M30 and M40 were developed by replacing natural coarse aggregate with 50% and 100% electric arc furnace oxidizing slag (EAFOS) aggregate. Thus, fresh properties of SCC; slump flow, T500, U box, V funnel and L-box were determined. From the evaluation of fresh properties, it is shown that the grades of concretes developed passed the set standard limits for SCC. The results showed that 50% EAFOS addition to SCC will not deter its fresh properties in any way, however, when EAFOS was added up to 100%, there was reduction in workability properties of the concrete. The study showcases the significant potential of EAFOS as an alternative aggregate in SCC. Thus, the data provided in this study will be useful for concrete constructors.

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Mechanical and durability properties of sustainable self-compacting concrete with recycled concrete aggregate and fly ash, slag and silica fume

Cited by 192 publications

References 38 publications

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Investigation into Creep Characteristics and Model of Recycled Construction and Demolition Waste Used in Embankment Filler

Fresh properties of self-compacting concrete incorporating electric arc furnace oxidizing slag (EAFOS) as coarse aggregate

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