Experimental study on use of lightweight foam concrete as subgrade bed filler of ballastless track

Huang, Junjie; Su, Qian; Zhao, Wenhui; Li, Ting; Zhang, Xiaoxi

doi:10.1016/j.conbuildmat.2017.04.122

Cited by 102 publications

(36 citation statements)

References 13 publications

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“…Huang et al put forward the use of lightweight foam concrete as the roadbed filling to control the settlement of the subgrade in special soil areas and established a large-scale model of unballasted subgrade filled with lightweight foam concrete. It was found that the strength of lightweight foam concrete with target density of 500-800 kg/m 3 can meet the requirements of both the static and dynamic conditions of ballastless track subgrade [5]. In order to improve the applicability and service life of ballastless track of high-speed railway, Liu et al proposed epoxy asphalt concrete as the lower structure of railway and studied the mechanical properties of materials and structures by material test and numerical simulation, and found that all the three EACs are suitable for the high-speed railway substructure, and the EACs could improve the cracking resistance and deformability of substructure.…”

Section: Inductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Repairing Effect of Polymer Grouting for Settlement of High-Speed Railway Unballasted Track

Fang

et al. 2019

Applied Sciences

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Uneven settlement of high-speed railway subgrade leads to the irregularity of high-speed railway line, which seriously affects high-speed train operation. The skylight point of high-speed railway operation is short and the maintenance time is limited. Therefore, how to quickly lift and repair the ballastless track slab in the subsidence section is an urgent problem to be solved in the maintenance of high-speed railways. The two-component non-aqueous reactive polymer material has the advantages of strong expansive force, fast reaction speed, and wide application range, which is extremely suitable for the repair of high-speed railway track slab subsidence and lifting. In this study, the expansion force characteristics of different density polymer materials and the stress-deformation curves at corresponding density are tested in laboratory to propose the mechanical parameters of polymer. Then, a three-dimensional finite element (FE) model of high-speed railway train ballastless-track subgrade is established based on ABAQUS. The mechanical characteristics of CRTS III ballastless track under different repair materials, different elevation, and different density of polymer grouting materials are analyzed. The results show that, under the dynamic load of the train, the stress value of polymer repairing material is less than that of cement slurry, presenting a compressive stress state, which is similar to that of the complete subgrade surface. In addition, within a certain thickness range, increasing the thickness of polymer is beneficial to reducing the difference of stress variation between polymer filling layer and complete pavement. Once beyond this range, the thickness of polymer has little effect on the force variation.

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Section: Inductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Repairing Effect of Polymer Grouting for Settlement of High-Speed Railway Unballasted Track

Fang

et al. 2019

Applied Sciences

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“…According to a variety of on-site tests, model tests, and numerical analysis on the dynamic soil pressure of subgrade bed under the slab track [20][21][22][25][26][27], the dynamic soil pressure at the subgrade surface under high-speed trains is mainly in the range of 13-30 kPa, which is less than code value 100 kPa [23]. Indoor and outdoor model tests usually take the actual dynamic soil pressure to apply on the subgrade surface rather than code value.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…Pham et al [18] carried out large-scale triaxial tests to research dynamic characteristics and mud pumping mechanism of graded gravel used as the upper layer of subgrade bed of the slab track. In a word, the issues of mud pumping occurring in the slab track-subgrade have yet to attract the attention of researchers, which is not the same as the settlement and vibration of the slab track-subgrade induced by high-speed trains which attracted wide concern [19][20][21][22]. Because mud pumping occurring in the slab track-subgrade of high-speed railway has not been so serious formerly, it begins to be prevailing in recent years.…”

Section: Introductionmentioning

confidence: 99%

Vibration Behavior and Reinforcement Effect Analysis of the Slab Track‐Subgrade with Mud Pumping under Cyclic Dynamic Loading: Full‐Scale Model Tests

Huang

Wang

et al. 2018

Shock and Vibration

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Mud pumping occurring in the subgrade bed can gradually deteriorate the performance of the slab track-subgrade, negatively affecting the comfort and safety of high-speed railway. In this paper, a full-scale model of the slab track-subgrade was established to analyze the vibration behavior of the model in normal condition and before and after mud pumping reinforced, as well as the reinforcement effect of mud pumping using low-viscosity epoxy resin. The research results show that the vibration acceleration and displacement and the settlement of the model in normal condition stabilize gradually with the increasing number of loading cycles. Under the upper layer of the subgrade bed saturated by water, mud pumping occurs in the subgrade bed as soon as the second loading stage reaches to 3.0 × 104 cycles, and the deterioration of mud pumping increases gradually with the increasing number of loading cycles. Moreover, a large volume of slurry composed of water and fine particles is squeezed out of the subgrade bed after the model is subjected to the second cyclic loading stage of 2.0 × 106 cycles, causing contact loss between the concrete base and the subgrade bed, which makes the acceleration and displacement of the concrete base increase abnormally compared with the model in normal condition, as well as the cumulative settlement of the subgrade bed. The model with significant mud pumping in the upper layer of the subgrade bed was reinforced by using low-viscosity epoxy resin. This effectively controlled the abnormal acceleration and displacement of the concrete base and restored the support capability of the subgrade bed for the concrete base of the slab track structure.

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“…In response to the lightweight of light transparent concrete, cast-in-place foams were mixed with concrete. Foaming agents can be classified into a synthetic foaming agent, resin soap-based foaming agent, and hydrolyzed protein-based foaming agent depending on the specifications [13,14]. In this study, a synthetic foaming agent and protein-based foaming agent, which are mainly applied in the field, were used to analyze the stable state and the unit weight of foams according to the type of foaming agent.…”

Section: Materials and Experiments Programmentioning

confidence: 99%

Flexural Performance of Transparent Plastic Bar Reinforced Concrete

Kim

Han

2018

Applied Sciences

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Featured Application: Reinforced transparent plastic bars applied to concrete can be used to attract the architect's interest as an interior and exterior materials for building design and construction.Abstract: In this study, experiments were conducted to derive a mix design for improving the flexural performance of light transparent concrete, which is attracting much attention and interest as an interior and exterior material for buildings, so that it could be easily applied in the field as a non-structural element by securing a lightweight, workability, and economic efficiency through the improvement of the concrete mix design and the use of economical materials for promoting its practical use. It was found that the mixing of polyvinyl alcohol (PVA) fiber was effective in improving the consistency by preventing the aggregate from floating due to the mixing of lightweight aggregate with a low specific gravity. The flexural performance test results showed that the load transfer factor (LTF) from the concrete matrix to the fiber was highest in the test specimens without plastic bars, followed by those with 5 and 10 mm plastic bars, respectively.

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Experimental study on use of lightweight foam concrete as subgrade bed filler of ballastless track

Cited by 102 publications

References 13 publications

Experimental and Numerical Investigation on Repairing Effect of Polymer Grouting for Settlement of High-Speed Railway Unballasted Track

Experimental and Numerical Investigation on Repairing Effect of Polymer Grouting for Settlement of High-Speed Railway Unballasted Track

Vibration Behavior and Reinforcement Effect Analysis of the Slab Track‐Subgrade with Mud Pumping under Cyclic Dynamic Loading: Full‐Scale Model Tests

Flexural Performance of Transparent Plastic Bar Reinforced Concrete

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