Beneficial utilization of ultra-fine dredged sand from Yangtze River channel as a concrete material based on the minimum paste theory

Luan, Jinjin; Chen, Xudong; Ning, Yingjie; Shi, Zhenxiang

doi:10.1016/j.cscm.2022.e01098

Cited by 6 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that the compressive strength of the dredged sand mortar at each stage is less than that of ordinary river sand. Luan et al [7] found that a high content of ultrafne dredged sand with a poor grain grading and small particle size compared with ordinary river sand in concrete increased the harmful porosity and water absorption and reduced friction between the aggregates, with the compressive strength of the concrete reduced as a result. Te addition of 50% FA results in a signifcant reduction in compressive strength, especially in the early stage with a decrease of 40.4% at 7 d compared with the OPC dredged sand mortar.…”

Section: Resultsmentioning

confidence: 99%

“…When the mixing amount was too high, the workability of the concrete was afected. Luan et al [7] used ultrafne dredged sand from the Yangtze River as a natural substitute for river sand in concrete preparation. Te results showed that the concrete had a lower harmful porosity with a 25% mass ratio of ultrafne dredged sand, representing increases of 11.4% and 10.61% compared with the control samples with mass ratios of 0% and 50%, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars

Qin¹,

Zhao²,

Wang

et al. 2023

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The main objective of this study is to improve the performance of ultrafine dredged sand mortars by using metakaolin (MK) and silica fume (SF) mixed with high-content FA. The mechanical properties and microstructure of the ultrafine dredged sand mortars were analyzed. The results show that the strong growth rate of the mortars with 5%, 10%, and 15% MK and SF contents, respectively, exceeds 30% at the age of 7 d. Compared with an ordinary Portland cement dredged mortar, the shrinkage of the specimens with 5% and 15% MK increases prior to 7 d and decreases by 16.9% and 13.8%, respectively, at 90 d. The addition of MK shows a better enhancement effect than that of SF, with the splitting tensile strength increased by 41.4% to 2.15 MPa with 15% MK compared with the mortar with a 50% FA content at 3 d. MK shows a higher enhancement effect than SF due to its uniquely active Al2O3. Moreover, a microstructural investigation based on scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) confirms that the physical filling and pozzolanic effects of MK and SF can optimize the microstructure of the slurry, improve the interfacial combination of different phases, and refine the pore size distribution of cement paste. The test results prove that high-content FA ternary cementitious systems containing MK or SF represent a sustainable solution to the resource utilization of building materials based on ultrafine dredged sand.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars

Qin¹,

Zhao²,

Wang

et al. 2023

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…These restrictions have resulted in challenges like limited supply, decreased quality, and higher prices for river sand. As a result, the search for alternative options to river sand has become an urgent matter [11]. Such restrictions have cascading effects, including instances of operators exceeding permit limits or engaging in unauthorized sand mining.…”

Section: Introduction 1overviewmentioning

confidence: 99%

A Comprehensive Review of Stone Dust in Concrete: Mechanical Behavior, Durability, and Environmental Performance

et al. 2023

View full text Add to dashboard Cite

The escalating demand for natural resources within the construction industry is progressing upward. At the same time, however, there is a great concern regarding the depletion of these resources. This review paper emphasizes the significance of utilizing alternative aggregate materials in concrete. Particularly, it aims to explore replacing natural sand with stone dust. On the one hand, the depletion of primary sources of natural sand worldwide, combined with environmental and ecological concerns, drives the adoption of alternative aggregate materials for sustainable concrete construction. On the other hand, stone dust, a waste from the quarrying industry, offers a cost-effective and practical solution for producing concrete. This article presents a comprehensive literature review of the main trends in utilizing stone dust in recycled aggregates in the past decade and its influence on concrete properties. It addresses critical research questions regarding the physical and chemical properties of stone dust aggregates compared to natural sand; the impact of stone dust on the workability, mechanical, physical, and durability properties of recycled concrete; and the potential reduction of environmental impacts in terms of energy consumption and emissions through the replacement of natural sand with stone dust. Ultimately, this paper proposes future investigative work based on identified research gaps.

show abstract

“…On the other hand, the abundant superfine river sand (SRS) found along most river beaches is a potential risk to the environment, leaving the ground with less vegetational cover, especially in dry and windy seasons [13][14][15]. Compared with different treatment methods, the low cost of SRS has led to its extensive utilization in modifying coarse sand to the required gradation and fineness of sand for concrete [16,17].…”

Section: Introductionmentioning

confidence: 99%

Case Study on the Performance of High-Flowing Steel-Fiber-Reinforced Mixed-Sand Concrete

Geng,

Zhang,

Wang

et al. 2023

Crystals

View full text Add to dashboard Cite

To promote the efficient utilization of bulk solid wastes, including superfine river sand and fly ash, high-flowing steel-fiber-reinforced mixed-sand concrete (SFRMC) was developed in this study. Superfine river sand and coarse manufactured sand were mixed in a proportion of 4:6 to make the mixed sand. Fly ash, with a content of 30~75%, was blended with 0~12% silica fume on the premise of equivalent activity. The water dosage and sand ratio were adjusted with the volume fraction of steel fiber, which varied from 0.4 to 1.6%, to ensure the high flowability of fresh SFRMC. The mechanical properties, including cubic and axial compressive strengths, modulus of elasticity, splitting tensile strength, and flexural strength and toughness of the SFRMC, were analyzed, accounting for the influences of the contents of fly ash and steel fiber. The predictive formulas for the splitting tensile strength, modulus of elasticity, and flexural strength were proposed by introducing the influencing factors of steel fiber. The SFRMC showed an increased modulus of elasticity with increases in the steel fiber factor, and flexural toughness was enhanced with increased contents of both steel fiber and fly ash.

show abstract

Beneficial utilization of ultra-fine dredged sand from Yangtze River channel as a concrete material based on the minimum paste theory

Cited by 6 publications

References 21 publications

A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars

A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars

A Comprehensive Review of Stone Dust in Concrete: Mechanical Behavior, Durability, and Environmental Performance

Case Study on the Performance of High-Flowing Steel-Fiber-Reinforced Mixed-Sand Concrete

Contact Info

Product

Resources

About