Toughness improvement mechanism and evaluation of cement concrete for road pavement: A review

Fang, Mingjing; Chen, Yiming; Deng, Yungang; Wang, Zhe; Zhu, Meifang

doi:10.1016/j.jreng.2023.01.005

Cited by 19 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A higher m/c ratio indicates superior resistance to cracking, signifying the ability of a concrete mix to withstand tensile stresses and maintain structural integrity. In the present study, the CEM repair material achieved an m/c ratio of 0.27 in 8 h. A typical C32/40 concrete has an m/c ratio of around 0.17 [37], and a high-strength concrete of more than 80 MPa has an m/c ratio of 0.08 [38]. Previous findings showed that higher-strength concrete is more brittle than lower-strength concrete.…”

Section: Application Of Cem As a Repair Materialssupporting

confidence: 56%

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Yeo,

Mo,

Mahmud

2023

Buildings

View full text Add to dashboard Cite

This research focuses on achieving early strength of cement-based materials through the hybrid nucleation acceleration method. Through the study of various mortar mixtures, which incorporate components such as ordinary Portland cement (OPC), fine limestone powder (with a particle size of d50: 1 μm), coarse limestone powder (with a particle size of d50: 12 μm), calcium silicate hydrate (C-S-H) nucleation seeding agent, and calcium nitrate (CN), the effect of the hybrid nucleation acceleration method was investigated. When OPC was substituted with 20% fine limestone powder, a strength of 13.5 MPa was achieved at 6 h, whereas the use of coarse limestone powder only yielded 3.5 MPa within the same time frame. The mortar containing 2% C-S-H nucleation seeding agent reached an impressive 16 MPa at 6 h. Meanwhile, through the synergistic combination of fine limestone powder and C-S-H nucleation seeding agent, the 6 h early strength attained an impressive 19 MPa. The micrograph revealed that the hybrid nucleation acceleration method significantly promoted the formation of a dense network of C-S-H within the paste, thus enhancing the packing density. Measuring the heat release demonstrated that the samples accelerated with the C-S-H nucleation seeding agent and fine limestone reached the peak 160 min earlier than the OPC sample, indicating a faster hydration process. The hybrid nucleation accelerated concrete (HNAC) achieved strengths of 20 MPa and 27 MPa within 6 and 8 h, respectively, whereas the 28-day strength surpassed 70 MPa. The concrete equivalent mortar (CEM), derived from concrete, attained a compressive strength of 25 MPa within 8 h, making it suitable for repair applications. The modulus of rupture (MOR) was 7.31 MPa at 8 h and increased to 17.27 MPa at 28 days. Overall, the developed concrete and CEM with the novel hybrid nucleation acceleration method allowed for high early and long-term strength for fast-track construction to be attained.

show abstract

Section: Application Of Cem As a Repair Materialssupporting

confidence: 56%

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Yeo,

Mo,

Mahmud

2023

Buildings

View full text Add to dashboard Cite

show abstract

“…In addition to the load, another factor that influences the cracking behavior of concrete slabs is the construction characteristics of the slab itself. The stability of hard pavements depends on many variables, such as the distance between reinforcements, steel grade, concrete grade, and slab thickness [17]. Thicker and stiffer slabs tend to produce smaller cracks.…”

Section: Concrete Quality F C =30 Mpa Steel Quality F U =580 Mpa the ...mentioning

confidence: 99%

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

Soehardjono,

Wibowo,

Nuralinah

et al. 2023

EEJET

View full text Add to dashboard Cite

The problem found in many rigid pavement concrete slabs is the occurrence of cracks. Research on the width of cracks in rigid pavement due to the influence of reinforcement ratio is necessary because the stiffness and strength of concrete slabs are related to slab thickness, concrete quality, reinforcing steel quality and reinforcement numbers. This study aims to determine the cracking behavior of rigid pavements subjected to monotonic static line loads due to variations in reinforcement ratio experimentally. Specimens tested in the laboratory were 2×0.6×0.2 m concrete slabs placed on 30 cm thick soil with 6 % CBR value as a support. The variation of reinforcement ratio was ρ=0.004; ρ=0.007; ρ=0.01; ρ=0.02. Concrete quality fc=30 MPa, steel quality fu=580 MPa. The results shows at small reinforcement ratios the results are close to the average crack width of the formula from the regulations and at large reinforcement ratios the results are further away from the average crack width based on the formula in the regulations. The largest crack width observed in this study occurred in rigid pavement with a reinforcement ratio of ρ=0.004, under a load of 210 KN, resulting in a crack width of 0.519 mm. It was found that the relationship between crack width and the reinforcement ratio follows a linear equation across all variations. The research also revealed variations in crack width between experiments conducted under different design codes, with results closely aligning with the average crack width determined by rule-based formulas, especially for a small reinforcement ratio (ρ=0.004). Conversely, for a larger reinforcement ratio (ρ=0.01), the results deviated further from the crack width predicted by the code-based formula

show abstract

“…In order to address the issue of highway pavements prone to cracking under persistent heavy loads, extensive research has been conducted by both domestic and foreign scholars. Studies have shown [10,11] that adding various fibers, including glass and polypropylene, to concrete can greatly improve its birth defects. These studies have demonstrated that the addition of fibers to concrete can effectively prevent cracking and improve the fatigue life of concrete.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fiber on the Mechanical Properties of Controllable Low-Strength Materials

Qian

Jiang

2023

Materials

View full text Add to dashboard Cite

Numerous studies have been conducted on fiber-reinforced concrete; however, comparative investigations specifically focusing on the utilization of fibers in CLSM remain limited. In this study, we conducted a systematic investigation into the mechanical properties of controlled low-strength material (CLSM) by manipulating the length and doping amount of fibers as control variables. The 7-day compressive strength (7d-UCS), 28-day compressive strength (28d-UCS), and 28-day splitting strength of CLSM were employed as indicators to evaluate the material’s performance. Based on our comprehensive analysis, the following conclusions were drawn: (1) A positive correlation was observed between fiber length and material strength within the range of 0–6 mm, while conversely, a negative correlation was evident. Similarly, when the fiber doping was within the range of 0–0.3%, a positive correlation was identified between material strength and fiber doping. However, the strength of CLSM decreased when fiber doping exceeded 0.3%. (2) SEM and PCAS analyses provided further confirmation that the incorporation of fibers effectively reduced the porosity of the material by filling internal pores and interacting with hydration products, thereby forming a mesh structure. Overall, this study offers valuable insights into the manipulation of fiber length and doping amount to optimize the mechanical properties of CLSM. The findings have important implications for the practical application of CLSM, particularly in terms of enhancing its strength through fiber incorporation.

show abstract

Toughness improvement mechanism and evaluation of cement concrete for road pavement: A review

Cited by 19 publications

References 48 publications

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

The Influence of Fiber on the Mechanical Properties of Controllable Low-Strength Materials

Contact Info

Product

Resources

About