Effects of curing temperature on mechanical properties and pore size distribution of cement clay modified by metakaolin and basalt fiber

Ma, Dongdong; Zhang, Wenpu; Wang, Xinpeng; Zhang, Rongrong; Zhou, Zhiwei; Yang, Yi; Shi, Yuhang

doi:10.1016/j.jobe.2023.106232

Cited by 8 publications

(4 citation statements)

References 39 publications

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“…The concrete was poured by vibration to ensure the uniformity of coarse aggregate in concrete. All SCAC specimens underwent 28 days of curing under the same conditions, following the curing method described in the literature [43]. In order to ensure the smoothness of the surface of the specimen, the upper and lower surfaces of the specimen were polished using a grinding machine after maintenance.…”

Section: Proportion and Sample Preparationmentioning

confidence: 99%

Experimental Study on the Effect of Limestone Powder Content on the Dynamic and Static Mechanical Properties of Seawater Coral Aggregate Concrete (SCAC)

Jiang

Zhu

et al. 2023

Materials

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The development of island construction concrete can serve as a basis for the development and utilization of island resources. Complying with the principle of using local materials to configure seawater coral aggregate concrete (SCAC) that is able to meet the requirements of island and reef engineering construction could effectively shorten the construction period and cost of island and reef engineering construction. In this paper, quasi-static mechanical experiments and dynamic mechanical experiments were carried out on SCAC with different limestone powder contents. High-speed photography technology and Digital Image Correlation (DIC) were used to monitor the dynamic failure process and strain field of SCAC, and the influence of limestone powder content on the dynamic and static mechanical properties of SCAC was investigated. The results showed that, when the limestone powder content was 20% and 16%, the quasi-static compressive strength and quasi-static tensile strength exhibited the best improvement. Additionally, with increasing limestone powder content, the dynamic tensile strength of SCAC first showed and increasing trend and then a decreasing trend, reaching its maximum value when the limestone powder content was 16%. Moreover, the maximum strain value of SCAC with the same limestone powder content increased with increasing strain rate grade, showing an obvious effect on strain rate.

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Section: Proportion and Sample Preparationmentioning

confidence: 99%

Experimental Study on the Effect of Limestone Powder Content on the Dynamic and Static Mechanical Properties of Seawater Coral Aggregate Concrete (SCAC)

Jiang

Zhu

et al. 2023

Materials

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“…Through on-site research, it has been found that due to the extremely harsh weather conditions and unreasonable placement of drainage facilities, about 80% of alpine cold tunnels have some degree of frost damage. This not only affects their normal operation but also causes major traffic accidents, posing significant difficulties for later maintenance and prevention 8 – 10 . For example, the Qidaoliang Tunnel located in Gansu Province and the Dabanshan Tunnel located in Qinghai Province in China have experienced various diseases such as severe water leakage, ice hanging, and lining cracking during the severe cold season.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional techniques for blocking and draining leakage water and treating lining cracks are gradually unable to meet the current needs, and new research on drainage structures is needed 10 – 14 . Kim et al 15 studied the causes of water seepage in alpine cold tunnels by developing new tunnel drainage structures.…”

Section: Introductionmentioning

confidence: 99%

Change of temperature field around different drainage structures in cold region tunnel based on model testing

Zhu,

Zhang,

Liu

et al. 2023

Sci Rep

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Improper layout of drainage structures and inadequate insulation measures in cold tunnels can result in varying degrees of frost formation during operation. This study focuses on the Hongtoushan highway tunnel as an example, where the distribution characteristics of the temperature field around the lower drainage structure under different arrangements are investigated through indoor model testing. The results indicate that there is a significant hysteresis phenomenon in temperature changes across the cross-section as the burial depth increases. With an increase in the burial depth of the surrounding rock, the hysteresis time of temperature changes gradually elongates. The temperature variation pattern can be approximated by a cubic polynomial. In the vertical section, as the tunnel depth increases, the temperature of the surrounding rock in the lower part of the tunnel gradually rises while the amplitude of temperature change diminishes. The temperature near the centerline is relatively lower compared to the sides, where the temperature gradually increases moving away from the centerline.

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“…However, there is a risk of aging under the effects of harsh environmental factors, which may lead to the failure of infrastructure. As a non-biologically active material, basalt fiber has a natural anti-aging ability [17][18][19][20]. Adding basalt fiber to cement soil material can effectively eliminate the influence of PVA fiber aging, thereby improving the stability of cement-soil materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Shu

Zhang

2023

Polymers

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Polyvinyl alcohol (PVA) fiber is widely used in geotechnical engineering because of its excellent physical and mechanical properties; however, PVA fibers are prone to aging, while basalt fiber has a natural anti-aging ability, which can be added to cement material to effectively eliminate the effects of aging on PVA fiber. Previous experiments identified that the optimum content of PVA fiber is 0.5% (mass fraction, the same below). Based on this, we continued to add basalt fibers of different lengths (3 mm, 6 mm, 9 mm, 12 mm, 18 mm, 30 mm) and different contents (0%, 0.25%, 0.5%, 0.75%, 1%) to study the effect of both length and content of basalt fibers on the strength of cement soil specimens. It was concluded that adding 0.5 % of 9mm basalt fiber results in the greatest increase in unconfined compressive strength (UCS). The UCS reached 12.59 MPa, which was 71% higher than specimens without fiber, and a regression analysis was carried out to obtain the relationship among them. The ratio of cement soil in the highest UCS and the relationship among the UCS, the length, and the content of basalt fiber can be used as a reference for practical projects. In addition, digital image correlation (DIC) technology was used to analyze the surface cracks and horizontal strain field when the peak strain was reached at each content and length of the basalt fiber. Finally, the curing mechanism for hybrid fiber cement soil was analyzed by combining the results of the UCS test, DIC test, and SEM test.

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Effects of curing temperature on mechanical properties and pore size distribution of cement clay modified by metakaolin and basalt fiber

Cited by 8 publications

References 39 publications

Experimental Study on the Effect of Limestone Powder Content on the Dynamic and Static Mechanical Properties of Seawater Coral Aggregate Concrete (SCAC)

Experimental Study on the Effect of Limestone Powder Content on the Dynamic and Static Mechanical Properties of Seawater Coral Aggregate Concrete (SCAC)

Change of temperature field around different drainage structures in cold region tunnel based on model testing

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

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