Dynamic monitoring of saturated stiff clay soil foundation structure by falling weight deflectometer system under impact loads sensors effect

Rasheed, Azad Hameed; Ahmed, Balqees A.

doi:10.1016/j.measen.2023.100673

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Accurate control and scientific evaluation of compaction quality are effective ways to solve the above problems. The portable falling weight deflectometer (PFWD) is widely used in road engineering due to its advantages of being fast, accurate, lightweight, and environmentally friendly; the subgrade deflection and resilient modulus under different material compositions can be rapidly evaluated based on the pressure and displacement sensors of a PFWD [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Brick Aggregate Content on Performance of Recycled Construction-Solid-Waste Aggregate

Zhu,

Ding,

et al. 2024

Materials

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In road engineering, road construction requires a large amount of natural aggregate; its substitution with recycled construction-solid-waste aggregate not only saves resources but also reduces the burden on the environment. The main components of construction solid waste are concrete blocks and brick slag; the breakability of the latter can affect the performance of mixed recycled aggregate, which hinders the use of construction solid waste in road engineering applications. To analyze the applicability of recycled construction-solid-waste aggregate containing brick slag aggregate in the subgrade layer, the effect of brick aggregate content on the CBR (California bearing ratio) and crushing value of mixed recycled aggregates was evaluated based on laboratory tests, and the field compaction quality of the recycled aggregates was analyzed. The results show that the 9.5–19 mm mixed recycled aggregate samples were crushed to a higher degree during the compaction process. A brick aggregate content less than 40% had little effect on the performance of mixed recycled construction-solid-waste aggregate. It is recommended to use a 22 t road roller for five passes (two weak vibrations + two strong vibrations + one weak vibration) at a speed of 3 km/h in the main compaction stage of the subgrade filling.

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Section: Introductionmentioning

confidence: 99%

Effect of Brick Aggregate Content on Performance of Recycled Construction-Solid-Waste Aggregate

Zhu,

Ding,

et al. 2024

Materials

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Utilizing Waste Engine Oil and Soft Binder as Additives to Mitigate the Moisture Damage of Asphalt Mixtures

Ismael,

Sahib,

Rasheed

2024

Eng. Technol. Appl. Sci. Res.

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The deterioration of asphalt pavements caused by moisture is a significant concern for asphalt pavement construction companies. To improve this characteristic, this research aims to determine how rejuvenators and flexible compounds, affect the resistance of asphalt concrete to moisture. This study investigates the effects of incorporating Waste Engine Oil (WEO), an easily obtainable and economical substance, into a maturing mixture. The action of this substance resulted in strengthening the physical and chemical characteristics of the bitumen, as well as mitigating the adverse effects caused by moisture. The various degrees of bitumen penetration ranged from 40-50 to 80-1. Extremely small limestone dust particles measuring 19.0 mm, were utilized as mineral infill in the aggregate grade. To enhance the Marshall characteristics, treatments containing 0%, 2%, 4%, and 6% WEO by weight of binder were implemented after filtration. The most advanced Marshall had a WEO content of 6% and an asphalt grade ranging from 85-100, while stability and resistance to moisture degradation were observed. Compared to combinations lacking WEO, the compressive strength and the indirect tensile strength value, were determined to find the Index of Retained Strength (IRS) and Tensile Strength Ratio (TSR). This reduced moisture susceptibility as TSR% and IRS% values increased by approximately 1.22% and 0.9%, respectively.

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Investigation of the Brittleness and Sensitivity of the Gypseous Sand Improved by Nano-clay

Abrahim,

Ibrahim,

Salih

et al. 2024

Eng. Technol. Appl. Sci. Res.

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This study examines the brittleness index and sensitivity ratio of two gypseous sand soils under saturation conditions improved by nano-clay. The soil samples were obtained from the cities of Al-Najaf and Tikrit containing 29% and 55% gypsum, respectively. The tests were performed on remolded specimens in a direct shear box. The soil specimens were examined mainly under saturated conditions for both different soil and nano-clay contents (0, 2, 5, and 7 %) under three normal stress levels: 25, 50, and 100 kPa. Additional tests were performed under dry soil conditions for comparison. The calculations of the brittleness index and sensitivity ratio of the saturated soil specimens were dependent on the newly suggested definitions of the peak values of the shear stress. The tP is the peak value in the dry condition, whereas the tR is the peak value in the saturation condition. The results emphasize that the values of the brittleness index and sensitivity ratio require more attention to the possibility that the soil is brittle owing to increased gypsum dissolution and the demolition of the soil structure. The brittleness index and sensitivity ratio increased with increasing gypsum content and decreased with increasing nano-clay content and average stress levels. The optimum percentage of nano-clay for both soil specimens was found to be 5%.

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Dynamic monitoring of saturated stiff clay soil foundation structure by falling weight deflectometer system under impact loads sensors effect

Cited by 3 publications

References 9 publications

Effect of Brick Aggregate Content on Performance of Recycled Construction-Solid-Waste Aggregate

Effect of Brick Aggregate Content on Performance of Recycled Construction-Solid-Waste Aggregate

Utilizing Waste Engine Oil and Soft Binder as Additives to Mitigate the Moisture Damage of Asphalt Mixtures

Investigation of the Brittleness and Sensitivity of the Gypseous Sand Improved by Nano-clay

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