Rock-filled concrete, the new norm of SCC in hydraulic engineering in China

An, Xuehui; Wu, Qiong; Feng, Jian; Huang, Minmin; Zhou, Hu; Chen, Changjiu; Liu, Chunna

doi:10.1016/j.cemconcomp.2014.08.001

Cited by 84 publications

(31 citation statements)

References 15 publications

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“…Rock-filled concrete (RFC) [1] is a new type of mass concrete and it is formed by filling self-compacting concrete (SCC) into the voids between a pre-placed assembly of rock grains. SCC has high flowability, and gravity alone can quickly fill the pores of the assembly of large rocks more than 300 mm in grain size.…”

Section: Introductionmentioning

confidence: 99%

Filling Capacity Evaluation of Self-Compacting Concrete in Rock-Filled Concrete

Liu

Pan

2019

Materials

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The good filling performance of self-compacting concrete (SCC) to pre-placed assembly of rocks is essential for quality of rock-filled concrete (RFC). In this study, a theoretical model is proposed to evaluate the filling capacity of SCC in porous media that is simplified to approximate the assembly of rocks. Numerical simulation of SCC flow in the porous media is carried out based on the computational fluid dynamics. The effects of yield stress of SCC and size and shape of grains in the porous media on the filling capacity of SCC are considered. The inclination of the free surface of the distribution of SCC at flow stoppage is defined to evaluate the filling capacity of SCC in the porous media. According to the theoretical model, the inclination is directly proportional to the yield stress of the SCC and the blocking effect of grains, while inversely proportional to the grain size. The numerical simulation provides consistent results with the theoretical model. The results suggest the use of rounded large rocks and SCC with low yield stress to ensure good quality of RFC.

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Section: Introductionmentioning

confidence: 99%

Filling Capacity Evaluation of Self-Compacting Concrete in Rock-Filled Concrete

Liu

Pan

2019

Materials

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“…Thus, RFC not only takes full advantage of low heat of hydration of SCC, but also makes the best of high strength of rock block [2,4,5]. In spite of a lower cement consumption, RFC has relatively high compressive strength, and was widely applied in hydraulic engineering in China for more than 60 newly constructed RFC dams [3], such as the Baoquan pumped storage power station (height of dam 36.90 m, completion date 2006/4), the Qingyu reservoir dam (height of dam 42.30 m, completion date 2012/11), the Hutiaoxia reservoir (height of dam 55.00 m, completion date 2013/5), the Sangwan reservoir (height of dam 16.96 m, completion date 2011/9), the Koushang reservoir (height of dam 58.40 m, completion date 2013/9), as well as dam reinforcement projects, for example, the Hengshan reservoir dam risk removal and reinforcing project in Shanxi Province in 2010 [6].…”

Section: Introductionmentioning

confidence: 99%

“…How to control quality of RFC has become a key subject in RFC projects, and has attracted the attention of many researchers. At present, research on the properties of RFC mainly focus on the mix proportions of SCC [6][7][8][9][10][11], and properties of ITZ [12][13][14][15][16][17]. Reasonable mix proportions of SCC, a key factor to guarantee SCC with high fluidity and good segregation resistance, and the performance of ITZ in RFC, have been widely researched by many scholars and engineers for decades.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Properties of Rock-Filled Concrete

et al. 2019

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In order to comprehensively evaluate the properties of rock-filled concrete (RFC) with the strength of C15, lab experimental test and in-situ test are applied to explore the mechanical, hydraulic, ultrasonic characteristics of RFC in Hantang reservoir dam. Four types of defects within RFC are shown from the appearance of borehole cores specimens: (1) large sized voids existing in interfacial transition zone (ITZ) between self-compacting concrete (SCC) and rock block (RB); (2) bad cohesion in ITZ; (3) joints within rock block; (4) voids within SCC. For hydraulic aspects, the average porosity of RFC is 14.10%; the permeability rate of RFC ranges from 2.41 Lu to 10.41 Lu, with the average of 11.32 Lu, occasionally more than 25.52 Lu due to interconnected defects. For ultrasonic aspects, the ultrasonic velocity of RFC conforms to lognormal distribution, with the average of 2993.3 m/s and standard deviation of 650.5 m/s. For mechanical aspects, the average cubic compressive strength of RFC is 22.55 Mpa, with the standard deviation of 4.09 Mp. Thus the data shows a relatively great dispersion due to uneven distribution of some defects in RFC, which deteriorate the quality of RFC. Through the experimental investigation, it is shown that the quality of massive RFC in the Hantang dam is obviously non-homogeneous, mainly influenced by construction technology.

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“…Predicting the workability of self-compacting concrete (SCC) during the mixing process is an important research problem in construction engineering. SCC is a highly workable material that can flow to fill gaps in reinforcements, corners of moulds, and voids in rock blocks, without exhibiting any vibration and compaction during the placement process [1][2][3]. To construct strong and durable structures, the SCC must be of superior workability [4].…”

Section: Introductionmentioning

confidence: 99%

Deep Learning Approach for Estimating Workability of Self‐Compacting Concrete from Mixing Image Sequences

Ding

2018

Advances in Materials Science and Engineering

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We propose a deep learning approach to better utilize the spatial and temporal information obtained from image sequences of the self-compacting concrete- (SCC-) mixing process to recover SCC characteristics in terms of the predicted slump flow value (SF) and V-funnel flow time (VF). The proposed model integrates features of the convolutional neural network and long short-term memory and is trained to extract features and compute an estimate. The performance of the method is evaluated using the testing set. The results indicate that the proposed method could potentially be used to automatically estimate SCC workability.

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Rock-filled concrete, the new norm of SCC in hydraulic engineering in China

Cited by 84 publications

References 15 publications

Filling Capacity Evaluation of Self-Compacting Concrete in Rock-Filled Concrete

Filling Capacity Evaluation of Self-Compacting Concrete in Rock-Filled Concrete

Experimental Research on the Properties of Rock-Filled Concrete

Deep Learning Approach for Estimating Workability of Self‐Compacting Concrete from Mixing Image Sequences

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