Investigation of freeze-thaw mechanism for crumb rubber concrete by the online strain sensor

Supervision, Methodology Lihua Zhang; Conceptualization, Supervision Chuanbei Liu

doi:10.1016/j.measurement.2021.109080

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…Figure 16 analyzes the development of the pore spacing coefficient after freeze-thaw cycles. According to the Fagerlund theory [32], the hydrostatic pressure caused by water freezing in concrete pores is directly proportional to the square of the pore spacing. A larger pore spacing leads to a longer flow of liquid water into adjacent pores.…”

Section: Average Pore Spacing Coefficientmentioning

confidence: 99%

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

2021

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This paper aims to develop frost-resistant concretes, and investigate their pore structures and freeze–thaw damage mechanism. The frost-resistant concrete mixtures are designed by using rubber particles and nano-SiO2 to partially replace sands. The chord lengths, specific surface areas, contents and spacing coefficients of the pores in the designed concretes are measured and analyzed. The results show that concrete mixture incorporated with 5% silanized rubber and 3% nanosilica shows good synergetic effect by considering both mass loss and relative dynamic modulus of elasticity (RDME). The freeze–thaw damage degree of the concrete could be reduced by adding high elastic rubber particles, due to filling and constraining pores, and resulting in better uniform pore distribution and smaller pore spacing coefficient. Furthermore, the correlations between frost resistance and pore are analyzed and proposed.

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Section: Average Pore Spacing Coefficientmentioning

confidence: 99%

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

2021

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“…The coefficient of freezing expansion of rubber concrete appears in three different stages with an increase in the number of freeze-thaw cycles. The stage of decline was less than 100 cycles, the plateau stage was between 100 and 200 cycles, and the stage of increase was after 200 cycles [107]. The reason for the initial decline is that when the interface between the rubber powder and cement matrix is damaged by freeze-thaw, the porosity is higher and the bond is poor, which attracts a large amount of water to the gap between the rubber and cement interface.…”

Section: Freeze-thaw Resistancementioning

confidence: 99%

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Zhang¹,

Wang²,

Wang³

et al. 2023

Journal of Renewable Materials

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Environmental problems caused by waste tires are becoming increasingly prominent. There is an urgent need to find a green way to dispose of waste tires, and scholars have made considerable efforts in this regard. In the construction industry, rubber extracted from waste tires can be added to concrete to alleviate environmental problems to a certain extent. As a new building material, rubber concrete has superior properties compared to ordinary concrete and has been widely used in many fields. Numerous studies have been conducted worldwide to investigate the effect of waste tire rubber on the performance of concrete. It has been reported that the addition of waste tire rubber has a significant influence on the performance of concrete. Workability influences the hardened performance of rubber concrete, especially the durability. Based on the current research results, the workability and durability of concrete manufactured with waste tire rubber, including water absorption and permeability, carbonation resistance, chloride ion permeability resistance, and freeze-thaw resistance, are summarized in this paper. It is concluded that the addition of waste tires has a negative effect on the workability of concrete. In terms of durability, concrete exhibits better chloride ion penetration resistance and frost resistance, with a higher water absorption rate, and lower anti-permeability and carbonation resistance owing to the addition of waste tire rubber.

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“…Crumb rubber addition to concrete changes failure pattern from brittle to ductile at the microscale observation and shows better performance under severe dynamic loads at the macroscale observation [28]. According to [29] rubber addition in concrete improves its resistance to frost which, besides brittleness, is a major problem in CBC mixtures. Encouraged by positive impact of rubber on concrete, authors decide to examine the influence of crumb rubber on CBC.…”

Section: Introductionmentioning

confidence: 99%

Influence of Laboratory Compaction Method on Compaction and Strength Characteristics of Unbound and Cement-Bound Mixtures

et al. 2021

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During road construction, granular materials for the unbound base course (UBC) and cement-bound base course (CBC) are mostly compacted by vibratory rollers. A widespread laboratory test for determining the optimal moisture content (OMC) and maximum dry density (MDD) of the mixture for installation in UBC and CBC is the Proctor test. Considering that the Proctor test does not produce any vibrations during compaction, this paper compares the Proctor test and the vibrating hammer test. The examination was conducted on UBC and CBC with varying cement content and aggregate types. All mixtures were compacted by both methods with the aim of determining the compaction and strength characteristics. The results indicated the high comparability of the two test methods for mixtures with natural aggregate in terms of MDD, OMC, density and strength characteristics (California bearing ratio (CBR) for UBC and 28-day compressive strength for CBC). For mixtures with higher cement content, the OMC difference depending on the laboratory compaction method used can be significant, so the laboratory compaction method should be chosen carefully, particularly for moisture-susceptible materials. This paper also reveals that by increasing the proportion of rubber in the mixture, the compaction and strength characteristics differ significantly due to the compaction method. Therefore, when using alternative and insufficiently researched materials, the compaction method should also be chosen carefully.

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Investigation of freeze-thaw mechanism for crumb rubber concrete by the online strain sensor

Cited by 10 publications

References 36 publications

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Influence of Laboratory Compaction Method on Compaction and Strength Characteristics of Unbound and Cement-Bound Mixtures

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