A comprehensive review on mechanical properties of green controlled low strength materials

Wang, Chaohui; Li, Yanduo; Wen, Penghui; Wei, Zeng; Wang, Xinqi

doi:10.1016/j.conbuildmat.2022.129611

Cited by 36 publications

(18 citation statements)

References 77 publications

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“…On the one hand, more honeycomb holes are formed with the more dosage of SAP when the SAP has released water and returns to a dry state. At the same time, the liquid water gradually froze in the freezing stage, and the volume increased, resulting in more cracks [ 35 ]. Therefore, the stress concentration occurred at the holes when the specimen was subjected to flexural stress, which may have further promoted the initiation of internal microcracks and exacerbated its expansion.…”

Section: Resultsmentioning

confidence: 99%

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

Qin

Lin

et al. 2023

Polymers

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This paper aims at solving the material durability problem caused by spraying deicing salt on pavement concrete in the northern winter. Super absorbent polymer (SAP) was adopted as an internal curing agent to enhance the durability of pavement concrete. Curing parameters including particle size and dosage of SAP and curing condition were optimized based on mortar tests by means of the grey target decision method. The deterioration rule of durability and mechanical properties of pavement concrete internally cured by different SAP dosages after salt freeze–thaw cycles were explored through rapid freeze–thaw test. Combined with the characteristics of pore structure, hydration and microstructure, the influence mechanism of SAP on the salt freeze–thaw resistance of pavement concrete was revealed. The experimental results showed that: (i) The reduction in mass loss rate and relative dynamic modulus was significantly improved by SAP internal curing with moderate dosage; (ii) The more freeze–thaw cycles the specimen underwent, the greater the increase in strength; (iii) After 75 cycles, the chloride ion erosion depth could be decreased by approximately 23.18%. Moreover, the addition of SAP could refine the pore size, inhibit the generation of shrinkage microcracks, and promote the degree of cement hydration in the late stage, which improved the internal density of the cement concrete structure. Therefore, the deterioration of pavement under the coupling effect of salt freeze–thaw was reduced.

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Section: Resultsmentioning

confidence: 99%

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

Qin

Lin

et al. 2023

Polymers

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“…1 The area S 1 , S 2 , S 3 , and S 4 enclosed by the corresponding load-deflection curve of the specimen at the corresponding deflection is calculated, where S 1 , S 2 , S 3 , and S 4 are the areas enclosed by the first crack deflection δ to the origin, δ to 3δ, 3δ to 5.5δ and 5.5δ to 10.5δ regarding the load-deflection curves and the horizontal coordinate axis, respectively. 2 The toughness indices I 5 , I 10 and I 20 are calculated according to Equations ( 11)-( 15), respectively.…”

Section: Testing Methodsmentioning

confidence: 99%

“…The following chemical methods [19] were used to modify the surface of PVA fibers: 1 the appropriate amount of PVA fiber and an appropriate amount of water were added into a beaker, stirring at high speed to form a suspension. 2 Epibromohydrin solution was added dropwise and the solution pH was adjusted to be greater than 11 by adding the appropriate amount of NaOH. The reaction was left at room temperature for 5 h. 3 The fibers were filtered, washed, and dried.…”

Section: Fiber Surface Modificationmentioning

confidence: 99%

“…Cement-stabilized macadam has been widely used in pavement bases, due to its high bearing capacity and stiffness. Its anti-cracking, anti-deformation and durability directly affect the service life of the road [1][2][3]. Long-term research and engineering practice have found that cement-stabilized macadam is prone to cracking due to the lack of resistance to dry shrinkage, temperature shrinkage, and fatigue resistance, resulting in reflection cracks in the asphalt surface layer, which significantly affect the quality of road use.…”

Section: Introductionmentioning

confidence: 99%

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Durability Performance of PVA Fiber Cement-Stabilized Macadam

Tan

Wang²,

Zheng³

et al. 2022

Sustainability

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To further improve the durability of cement-stabilized macadam and guarantee the use quality and sustainability of a semi-rigid base, the current study was carried out. With the help of a dry shrinkage test, temperature shrinkage test, freeze–thaw bending test, and fatigue test, the effect of incorporating PVA fiber on the deformation characteristics of cement-stabilized macadam was analyzed, and the changes in low-temperature residual toughness of the mixture before and after modification were compared. The low-temperature toughness of PVA fiber cement-stabilized macadam was evaluated with the help of the standard toughness evaluation method. The fatigue life prediction equation of PVA fiber cement-stabilized macadam was established based on the Weibull distribution. The results showed that PVA fiber can effectively improve the deformation characteristics, low-temperature toughness, and fatigue performance of cement-stabilized macadam. The low-temperature residual flexural tensile strength and low-temperature bearing capacity were increased by 10.3% and 55.3%, respectively. The residual toughness indices were increased by 58.6%, 88.1%, and 98.3% and the residual strength index was increased by more than 100%. The fatigue life was improved by 178~368% under different stress intensity ratios. The fatigue life values obeyed the two-parameter Weibull distribution, and the correlation between the fatigue life prediction equation and the measured data was significant. The fatigue life prediction error was between 0.03 and 4.9% under different stress intensity ratios.

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“…In summary, it can be seen that there have been many studies on the application of CLSM, indicating its potential advantages in construction projects. Although Blanco et al [13] proposed a preliminary methodology for the design of optimized CLSM combining FEM simulation and experimental testing, the design of CLSM is primarily based on experimental approaches [14][15][16][17][18][19]. For instance, Fauzi et al [14] adopted laboratory testing and an empirical response surface method to evaluate the effect of key parameters on the properties of CLSM mixes produced with unprocessed fly ash and recycled fine aggregate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Application of Controlled Low-Strength Materials in Trench Backfilling in Suqian City, China

Xu,

Luo,

Tang

et al. 2024

Materials

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When backfilling narrow spaces, controlled low-strength materials (CLSM) can be used to achieve an effective backfilling effect. The pipeline engineering in Yahnghe Avenue of Suqian, China, provides a favorable on-site condition for the use of CLSM. However, no guidance exists for the determination of the material mixture ratio of CLSM for this geological condition. Laboratory tests were performed to investigate the basic physical parameters of excavated soil and the optimal mixture ratio of CLSM. Results indicate that the sand and silt account for 29.76% and 57.23% of the weight of excavated soil, respectively. As the water content increases (from 40% to 50%), the flowability of the CLSM approximately shows a linear increase (slumps values from 154.3 mm to 269.75 mm for 9% cement content), while its compressive strength shows a linear decreasing trend (from 875.3 KPa to 468.3 KPa after curing for 28 days); as the cement content increases (from 6% to 12%), the flowability approximately shows a linear decreasing trend (from 238.8 mm to 178.5 mm for 45% water content), while the compressive strength shows a linear increasing trend (from 391.6 KPa to 987.6 KPa after curing for 28 days). By establishing the relationship between compressive strength/flowability and the water–cement ratio, the optimal material ratio is determined to be 9% cement content and 40–43% water content. The engineering application results indicate that the use of CLSM can achieve efficient and high-quality backfilling effects for pipeline trenches. The findings of this research may provide a reference for the application of CLSM in fields with similar geological conditions.

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A comprehensive review on mechanical properties of green controlled low strength materials

Cited by 36 publications

References 77 publications

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

Durability Performance of PVA Fiber Cement-Stabilized Macadam

Experimental Study and Application of Controlled Low-Strength Materials in Trench Backfilling in Suqian City, China

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