Unified fatigue characteristics model for cement-stabilized macadam under various loading modes

Lv, Songtao; You, Lihua; Wang, Xiaofeng; Li, Jianglong; Zheng, Jianlong

doi:10.1016/j.conbuildmat.2019.07.053

Cited by 41 publications

(3 citation statements)

References 23 publications

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“…However, in the actual project, the base is generally loose granular type and the side of the road shoulder cannot directly discharge the roadbed due to slope rain erosion, resulting in the drainage function into water storage function. This is very detrimental to the strength, durability, frost swelling resistance and service life of pavement structural layers (Jing et al ., 2020; Lv et al ., 2019, 2020; Du, 2019; Li et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

Study on the design and laboratory investigation of permeable semi-rigid base material with large air voids

Li,

Xiao,

Zhao

et al. 2024

IJSI

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PurposeTo explore the economical and reasonable semi-rigid permeable base layer ratio, solve the problems caused by rainwater washing over the pavement base layer on the slope, improve its drainage function, improve the water stability and service life of the roadbed pavement and promote the application of semi-rigid permeable base layer materials in the construction of asphalt pavement in cold regions.Design/methodology/approachIn this study, three semi-rigid base course materials were designed, the mechanical strength and drainage properties were tested and the effect and correlation of air voids on their performance indexes were analyzed.FindingsIt was found that increasing the cement content increased the strength but reduced the air voids and water permeability coefficient. The permeability performance of the sandless material was superior to the dense; the performance of the two sandless materials was basically the same when the cement content was 7%. Overall, the skeleton void (sand-containing) type gradation between the sandless and dense types is more suitable as permeable semi-rigid base material; its gradation is relatively continuous, with cement content? 4.5%, strength? 1.5 MPa, water permeability coefficient? 0.8 cm/s and voids of 18–20%.Originality/valueThe study of permeable semi-rigid base material with large air voids could help to solve the problems of water damage and freeze-thaw damage of the base layer of asphalt pavements in cold regions and ensure the comfort and durability of asphalt pavements while having good economic and social benefits.

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Section: Introductionmentioning

confidence: 99%

Study on the design and laboratory investigation of permeable semi-rigid base material with large air voids

Li,

Xiao,

Zhao

et al. 2024

IJSI

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“…Among them, the semirigid cement-stabilized macadam (CSM) base is the most widely used base course in China. CSM base has excellent properties, such as compressive strength, rigidity, fatigue resistance, bending tensile strength, and strong load spreading ability, so it is widely used in highway bases or sub-bases (Li et al, 2021;Du et al, 2019;Lv et al, 2019a;Lv et al, 2021b). However, this material still has some defects as a base: (1) the shrinkage and cracking of the CSM base can cause different reflective cracks in the asphalt pavement (Farhan et al, 2018;You et al, 2020); (2) the CSM has poor water seepage performance; (3) after the CSM base is damaged, it cannot be repaired; (4) the CSM base has excellent integrity, but as the use time increases, the strength and modulus of the material will gradually decay due to fatigue factors under repeated loads.…”

Section: Introductionmentioning

confidence: 99%

Property Evaluation of Cement-Stabilized Macadam Modified via Phosphorus Slag Materials

et al. 2022

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Phosphorus slag, known as the waste product of the phosphate ore industry, is causing critical environmental issues due to its direct exposure to natural spaces. In this article, a partial replacement of the natural fine aggregate ordinarily used in cement-stabilized macadam (CSM) base by phosphorus slag was explored to be an effective solution for phosphorus slag waste. CSM specimens were fabricated by adding various dosages of phosphorus slag particle and fine powder, whereas the optimum moisture content and maximum dry density were analyzed through compaction tests. Compressive strength, bending tensile strength, fatigue life span, dry shrinkage, and temperature shrinkage performance at different curing durations were investigated to evaluate the properties of modified macadam. Results show that phosphorus slag reduced the early compressive strength of CSM to a small extent, but the compressive strength finally increased at 90 days’ curing. The modified slag particles and slag fine powder exhibited different behaviors to repeated loading, moisture loss, and temperature difference. Finally, according to the strength change, fatigue performance comparison, and shrinkage strain caused by the incorporation of phosphorous slag materials into the CSM, it was verified that 25% of the particles to 40% of the fine powder is the best replacement ratio.

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“…By the end of 2018, the total mileage on China’s highways was 4.85 million kilometers, including 142,600 km of expressways. Most of the pavement structures are asphalt pavement [1,2,3,4,5]. However, with the growth of the traffic volume, neat asphalt binder is difficult to meet modern transport development demands and needs to be modified.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Low-Temperature Performance of Buton Rock Asphalt Composite Modified Asphalt by Adding Styrene-Butadiene Rubber

Fan

et al. 2019

Materials

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To improve the low-temperature performance of the Buton rock asphalt (BRA)-modified asphalt, styrene-butadiene rubber (SBR) was added to it. The BRA-modified asphalt and SBR-BRA composite modified asphalt were prepared by high-speed shearing method. The penetration, softening point, ductility, and Brookfield viscosity of the two kinds of asphalt were measured. The dynamic shear rheometer (DSR) and the beam bending rheometer (BBR) were employed to research the performance of BRA-modified asphalt by adding SBR. The results showed that the pure asphalt in BRA was the main reason to reduce the low-temperature performance of neat asphalt when the content of BRA was 19%. However, the ash in BRA was the main factor to reduce the low-temperature performance when its content was more than 39.8%. When the BRA content was 59.8%, the SBR-BRA composite modified asphalt with SBR contents of 2%, 4%, 6%, and 8%, and it shows that the penetration and ductility of the BRA-modified asphalt are increased by the addition of SBR. The equivalent brittle point was reduced, the stiffness modulus was decreased, and the creep rate was increased. At the same time, the Brookfield viscosity was reduced and the rutting factor was increased. The stiffness modulus of the SBR-BRA composite modified asphalt mixture was increased. That is to say, when SBR was mixed into the BRA-modified asphalt, the low-temperature performance could be remarkably improved based on ensuring high-temperature performance. The low-temperature index of composite modified asphalt was analyzed. It was recommended to apply the equivalent brittle point to evaluate the low-temperature performance of SBR-BRA composite modified asphalt.

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Unified fatigue characteristics model for cement-stabilized macadam under various loading modes

Cited by 41 publications

References 23 publications

Study on the design and laboratory investigation of permeable semi-rigid base material with large air voids

Study on the design and laboratory investigation of permeable semi-rigid base material with large air voids

Property Evaluation of Cement-Stabilized Macadam Modified via Phosphorus Slag Materials

Improvement of Low-Temperature Performance of Buton Rock Asphalt Composite Modified Asphalt by Adding Styrene-Butadiene Rubber

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