Study on fracture parameters and fracture process zone of manufactured-sand recycled aggregate concrete

Xu, Yingjie; Chen, Hongniao; Tang, Yuxiang

doi:10.1016/j.conbuildmat.2022.129613

Cited by 23 publications

(6 citation statements)

References 56 publications

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“…It may be attributed to the boundary effect of the specimen as the residual ligament is not long enough, thus the crack opening dominates the crack propagation. Similar phenomena were also reported in previous studies [54,55], where the maximum lFPZ was about 0.75-0.90 and 0.86-0.92 of the ligament depth for normal concrete [55] and manufactured-sand recycled aggregate concrete [54].…”

Section: Rs Content Rp Contentsupporting

confidence: 91%

“…Given that the setting of parameters related to the subset affects the boundary range of DIC measurement [41], the wFPZ at a location 2 mm above the notch was taken to facilitate a comparison of the different mortars. The FPZ width tends to be stable after the peak load [54,59], despite that there may be partial microcrack closure. To compare the FPZ geometric characteristics of mortar with different recycled materials, the average fully-developed FPZ length and width of different mortars are presented in Fig.…”

Section: Rs Content Rp Contentmentioning

confidence: 97%

“…The energy dissipation during the fracturing process is concentrated in the fracture process zone (FPZ), which is a damage zone with many fracture toughening mechanisms, including microcracking, crack deflection, branching and aggregate bridging [52]. The geometry of FPZ can be visualized by the measured surface strain field [53][54][55][56]. To employ it, it is necessary to specify the strain threshold to eliminate the irrelevant noise [56,57].…”

Section: Fracture Process Zone Evolutionmentioning

confidence: 99%

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Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Tang

Xiao

Wang

et al. 2023

Cement and Concrete Composites

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Section: Rs Content Rp Contentsupporting

confidence: 91%

Section: Rs Content Rp Contentmentioning

confidence: 97%

Section: Fracture Process Zone Evolutionmentioning

confidence: 99%

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Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Tang

Xiao

Wang

et al. 2023

Cement and Concrete Composites

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“…The presence of SP in M-sand positively influences concrete pore filling, rendering it advantageous for use in an atmospheric acidification environment. Xu et al (2022) [26] examines fracture parameters and the fracture process zone (FPZ) in M-sand recycled aggregate concrete (RAC) with different recycled coarse aggregate (RCA) replacement rates. Using three-point bending tests, a crack identification method (TCIM) accurately locates crack tips and FPZ, coupled with digital image correlation (DIC) for fracture mechanism analysis.…”

Section: Literature Reviewmentioning

confidence: 99%

Inspection of the mechanical and durability behavior of concrete developed using M-sand

2023

IJATEE

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Growing global demand for river sand (R-sand), especially in India, is unsustainable, consuming 32-50 billion tonnes annually for concrete. This overuse threatens supply. R-sand extraction harms the environment and infrastructure. In response, M-Sand is a popular, consistent, and legal alternative. When using unwashed M-Sand, be aware of potential higher fines content, requiring more water for workability. Replacing R-sand with M-Sand enhances overall strength and performance of concrete. Manufacturing sand (M-Sand) also outperforms R-sand in terms of strength, with particle shape and texture less influential than stone powder (SP) and clay content. Choosing the right application can optimize M-Sand performance in concrete. *Author for correspondenceIn the realm of construction materials, the amalgamation of aggregates bound by cementitious paste has granted concrete unparalleled versatility, strength, and durability. This compels concrete to emerge as the paramount choice for construction endeavors [1,2]. The expanding urban landscapes worldwide have triggered a surge in construction activities, consequently driving the demand for cement to unprecedented heights. Projections made in 2016 forecasted a robust annual growth rate of 5.2%, catapulting the global cement market to an astounding 51.7 billion tons [3,4]. This escalating construction fervor has escalated the necessity for sand, a pivotal component in concrete manufacturing [5]. The conventional choice of natural R-sand as a fine aggregate has encountered challenges due to its depleting availability and soaring costs [6,7]. In response, manufactured sand has gained prominence as a promising alternative. Characterized by its finer particles that adeptly fill microscopic concrete pores,

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“…The demand for sand as a construction resource is quite high due to the expansion of the construction sector and significant infrastructure projects, which has increased the amount of illegal sand mining. Now more than ever, it is necessary to find a substitute for river sand in construction projects [11,12]. Engineers and researchers have developed concepts for reducing the usage of river sand and for using many alternative materials instead, such as stone crusher dust, foundry sand, manufactured sand, and many other waste products [13].…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of Manufactured sand and Silica Fume on the properties of Concrete

Chowdary,

Mahajan,

Jaggi

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In the present era, concrete is one of the most commonly used construction materials worldwide. Consequently, the demand for natural river sand is increasing. Since the mining of natural sand has already been outlawed by the government in many regions, now it is essential to look into sustainable materials to control natural sand extraction. Hence, manufactured sand (MS) has been shown in numerous studies to be a more practical and environmentally responsible alternative to river sand (RS), which is normally used in the production of concrete. At the same time, the cement industry produces tons of greenhouse gases into the atmosphere, affecting atmospheric conditions. Now, it’s time to look into a suitable replacement material for cement. To investigate the feasibility of using manufactured sand & silica fume in place of river sand and cement under normal climatic conditions fresh, mechanical and durability properties were conducted in the laboratory. Twelve samples of M30 grade cubes and cylinders at desired M sand percentages of 0, 20, 40, 60, 80, and 100 & 0% and 5% variation of silica fume with cement are included in this study as a comparison to the control mix. After 28 days of water curing, a random variation in the properties of concrete was observed in the samples. In this experimental study, SF represents Silica Fume, MS represents manufactured sand, RS represents river sand, FA represents Fine aggregates and CA represents Coarse aggregates.

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Study on fracture parameters and fracture process zone of manufactured-sand recycled aggregate concrete

Cited by 23 publications

References 56 publications

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Inspection of the mechanical and durability behavior of concrete developed using M-sand

Investigating the effect of Manufactured sand and Silica Fume on the properties of Concrete

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