Effects of micro-nano-lime (CaCO3) particles on the strength and resilience of road clay beds

Tanzadeh, Rashid; Vafaeian, M.; Fard, Mikael Yusefzadeh

doi:10.1016/j.conbuildmat.2019.05.048

Cited by 19 publications

(4 citation statements)

References 17 publications

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“…The objective of the compaction procedure is to minimize the soil's porosity. This process is assisted to some level by the presence of water [16]. Proctor compaction tests were conducted on samples in accordance with ASTM D698-12 [17] to determine the MDD and OMC of the clay sample.…”

Section: Methodsmentioning

confidence: 99%

The application of coffee husk ash to improve compaction characteristics of clay soil

Munirwan

Taib

Taha

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Soil stabilization is the modification process of one or more soil properties mechanically or chemically to generate an improved soil material with the appropriate engineering properties. Recently, stabilization methods utilizing commonly used stabilizing agents are becoming more costly. On the other hand, there is an increasing interest in identifying new green technologies that may be used to improve construction practices. As a result, the search for new materials and improved processes for processing local materials has moved to a priority. Thus, this study was conducted to validate the effectiveness of coffee husk ash (CHA) as a stabilizing agent on the compaction characteristics of clayey soil. To characterize the properties of clayey soil admixed with varying concentrations of CHA, Atterberg limits, grain size distribution, and standard proctor compaction tests were conducted. The soil was mixed with CHA in concentrations ranging from 5% to 25% by dry weight of the soil. Observation indicates CHA progressively enhances soil compaction performance. The pozzolanic and hydration reactions between CHA and the soil may have made the soil more likely to be compacted.

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Section: Methodsmentioning

confidence: 99%

The application of coffee husk ash to improve compaction characteristics of clay soil

Munirwan

Taib

Taha

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The strength test results increased significantly, such as the CBR of subgrade soil increased by six times. Compared with lime powder, the performance of lime nanoparticles in terms of consumption and initial setting time is improved [27]. The above research shows that nano materials can effectively improve the mechanical properties of soil and the initial setting time of lime soil.…”

Section: Introductionmentioning

confidence: 86%

Unconfined Compressive Strength and Splitting Tensile Strength of Lime Soil Modified by Nano Clay and Polypropylene Fiber

et al. 2022

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Here we study the effects of nano clay and polypropylene fiber on the unconfined compression and splitting properties of lime soil. Through a series of unconfined compressive strength (UCS) tests and splitting strength (STS) tests, the mechanical properties of lime soil (LS), nano clay modified lime soil (NLS), fiber modified lime soil (FLS), nano clay and fiber composite modified lime soil (NFLS) are analyzed, and the volume calculation formula of each phase in NFLS is deduced. Nano clay content αn, porosity volume η and lime volume LVi as independent variables, and the prediction models of UCS and STS of NFLS were established. Furthermore, the microstructure of LS, NLS, FLS and NFLS was analyzed by scanning electron microscope (SEM). It can be concluded that (1) with the increase in nano clay content, the UCS and STS of LS and FLS gradually increase. With the increase in fiber content, the UCS of LS first increases and then decreases, while the UCS and STS of NLS and STS of LS increase with the increase in fiber content, and the optimal fiber content is 0.75%. (2) UCS and STS of NFLS and η/LVi meet the linear relationship. The empirical formulas of UCS and STS established in this paper have a prediction accuracy of less than 10%. The strength of NFLS can be predicted according to the dry density of the sample and the content of each component material. (3) Nano clay can fill the pores of LS and promote the pozzolanic reaction between lime and soil, while fiber mainly plays a reinforcing role in LS, so as to improve the UCS and STS of LS. In NFLS, nano clay can improve the interfacial properties between fiber and LS, so as to improve its UCS and STS. This study can provide a reference for the modification technology of lime soil.

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“…Other studies investigating the effect of silica fume and polypropylene fiber modification on the strength and freeze-thaw behavior of lime-stabilized kaolinite clay have found that these reinforced clays can be an economic and environmentally friendly alternative in soil stabilization projects [20]. Based on results of Tanzadeh et al [21], the optimal weight percentages for lime powder and lime nanoparticles were approximately 4 and 1, respectively, when they were combined with clay. The swelling pressure, expansion percentage, and time rate of swell decrease, whereas the unconfined compressive strength (UCS) increases with the addition of expanded polystyrene (EPS) to soils [22].…”

Section: Introductionmentioning

confidence: 99%

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

et al. 2022

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Silty clay can be found in the alpine region of the Qinghai province, China, where it is subject to annual freeze-thaw cycles. To investigate the static mechanical properties of silty clay modified by basalt fiber and basalt powder under the action of freeze-thaw cycles, triaxial compression tests and scanning electron microscope tests were conducted on the soil. The test results revealed that varying the number of freeze-thaw cycles resulted to different effects on the soil mechanical strength, which tended to increase after 2 cycles, but then tended to decline when subjected to 5–10 cycles. After 20 freeze-thaw cycles, soil strength reached a dynamic equilibrium state. The shear strength of basalt fiber soil and basalt powder soil increased by 7.55% and 5.12%, respectively, compared with that of normal soil under 30 freeze-thaw cycles. Subsequently increasing of the number of freeze-thaw cycles differentially affected the cohesion and internal friction angle of normal soil and admixture soils, and these soils gradually tended to stabilize at a mechanical strength higher than the initial value. Basalt fibers reinforced the soil to a higher degree than basalt powder at a dosage of 0.4% based on dry soil mass. The stress-strain curves of the three soil types can be simulated using the hyperbolic model. The results of the study can provide some theoretical reference for practical engineering in seasonal frozen soil areas.

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Effects of micro-nano-lime (CaCO3) particles on the strength and resilience of road clay beds

Cited by 19 publications

References 17 publications

The application of coffee husk ash to improve compaction characteristics of clay soil

The application of coffee husk ash to improve compaction characteristics of clay soil

Unconfined Compressive Strength and Splitting Tensile Strength of Lime Soil Modified by Nano Clay and Polypropylene Fiber

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

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