Experimental investigation on leaching behavior of ultra-high performance concrete submitted to a flow environment

Tao, Liang; Zhou, Jikai; Wu, Qingqing

doi:10.1016/j.conbuildmat.2023.130843

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…Comparing these results to the 3-day data, it becomes evident that all samples experienced a slight increase in compressive strength. This enhancement can be attributed to the ongoing hydration process and the formation of calcium silicate hydrate gel (C-S-H gel) within the concrete matrix, contributing to strength development over time [ 54 , 57 ]. The data from Figure 4 indicates that the compressive strength values for the same mixtures at the 28-day mark of the standard curing period were 106 MPa for the control mix, 107 MPa for CNT1, 109 MPa for CNT2, and 102 MPa for CNT3 mixture, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Concrete

Rafieizonooz,

Kim,

Kim

et al. 2024

Materials

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This study delved into the integration of carbon nanotubes (CNTs) in Ultra-High Performance Concrete (UHPC), exploring aspects such as mechanical properties, microstructure analysis, accelerated chloride penetration, and life service prediction. A dispersed CNT solution (0.025 to 0.075 wt%) was employed, along with a superplasticizer, to ensure high flowability in the UHPC slurry. In addition, the combination of high-strength functional artificial lightweight aggregate (ALA) and micro hollow spheres (MHS) was utilized as a replacement for fine aggregate to not only reduce the weight of the concrete but also to increase its mechanical performance. Experimental findings unveiled that an increased concentration of CNT in CNT1 (0.025%) and CNT2 (0.05%) blends led to a marginal improvement in compressive strength compared to the control mix. Conversely, the CNT3 (0.075%) mixture exhibited a reduction in compressive strength with a rising CNT content as an admixture. SEM analysis depicted that the heightened concentration of CNTs as an admixture induced the formation of nanoscale bridges within the concrete matrix. Ponding test results indicated that, for all samples, the effective chloride transport coefficient remained below the standard limitation of 1.00 × 10−12 m2/s, signifying acceptable performance in the ponding test for all samples. The life service prediction outcomes affirmed that, across various environmental scenarios, CNT1 and CNT2 mixtures consistently demonstrated superior performance compared to all other mixtures.

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Section: Resultsmentioning

confidence: 99%

Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Concrete

Rafieizonooz,

Kim,

Kim

et al. 2024

Materials

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“…This means pervious mortar or concrete can dissolve or leach if exposed to specific water qualities for an extended period (11). Leaching is a significant degradation observed in cement-based composites, representing one of the primary factors responsible for their mechanical alteration (12)(13)(14)(15)(16). This process starts when cement paste comes into contact with pure or acidic water (low pH), causing hydrolysis (17).…”

Section: Introductionmentioning

confidence: 99%

“…Various researchers have extensively studied leaching in concrete or pervious concrete, primarily with immersion tests (14,18,19). The column method has received less attention by comparison.…”

Section: Introductionmentioning

confidence: 99%

Leaching Potential and Effectiveness of Pervious Mortar Filters in Bacteria and Turbidity Removal from Surface Water

Yogafanny,

Triatmadja,

Nurrochmad

et al. 2024

IJE

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A pervious mortar filter (PMF) is a modification of pervious mortar and pervious concrete designed as a water filter that, based on its physical characteristics, can reduce turbidity and bacteria. However, chemically, it contains minerals that can dissolve upon contact with water and be found in effluent. This study aimed to determine the performance of PMF in treating surface water by reducing turbidity and Escherichia coli and to assess its leaching potential. PMF specimens were created by mixing sand (0.6-0.85 mm), cement, and water with sand-to-cement ratios (M) of 4 and 5 and a water-to-cement ratio (w/c) of 0.4. Each mixture was then molded into pipes with a diameter of 8.2 cm and different thicknesses: 3, 5, and 10 cm. Raw surface water was used for the performance and leaching tests. Results showed that PMF effectively removed 95% turbidity and 99.71% E. coli, which increased with the filtration duration. PMF reduced E. coli more effectively when designed with a thickness of 10 cm than 5 or 3 cm because it would provide more surface areas for suspended solids and bacteria to attach and be retained. More substantial increases (mean %) of pH, hardness, calcium ions, and TDS were observed in PMF M4 with a thickness of 10 cm than in thinner ones because it contained more cement that would dissolve when in contact with water.

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“…Leaching is one of the degradation phenomena that occur in concrete or cement-based composites. Leaching is one of the main factors that change the mechanical properties of cement-based composites [15][16][17][18][19]. The deterioration process known as "leaching" in the cement paste occurs due to contact with pure water or water with a low pH, which encourages the hydrolysis of hydrates [20].…”

Section: Introductionmentioning

confidence: 99%

“…Dissolution is a process of carrying compounds/ions in concrete due to the leaching process due to the contact between water and portlandite (Ca(OH)2). Portlandite is one of the crystals formed from a mixture of cement and water [17,21]. Leaching develops through a dissolution/precipitation process in concrete.…”

Section: Introductionmentioning

confidence: 99%

The Leaching Behavior of Pervious Mortar Used as Water Filter in Rural Areas

Yogafanny

2023

GEOMATE

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Many people in rural areas use freshwater, including irrigation water for domestic purposes. The pervious mortar filter (PMF) is a modification of mortar and pervious concrete, designed as an alternative water filter to improve the natural water quality for domestic use. According to its physical characteristics (pore structure and geometry), pervious mortar can be a filter to reduce several types of pollutants in the water. On the other hand, based on its chemical characteristics, pervious mortar can be dissolved if passed by certain types of water for an extended period, called leaching. This study aims to determine the leachability of pervious mortar filters by identifying the influent and effluent concentration of calcium ion (Ca 2+ ), hardness, pH, and total dissolved solids (TDS) in two types of water sources, i.e., pure water and irrigation water. This study analyzes the leachability of the filter by the filter column experiment method. The leaching is analyzed by the water's pH, TDS, calcium ion (Ca 2+ ), and hardness concentration before and after the water is filtered by PMF. The filtered water for each specimen was 50 liters (L). 50 L of pure water showed increased pH, TDS values, Ca 2+ concentration, and hardness in the effluent. The increase in pH, TDS, Ca 2+ , and hardness concentration in the effluent with irrigation water was less than the increase of the same parameter in PMF through pure water.

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Experimental investigation on leaching behavior of ultra-high performance concrete submitted to a flow environment

Cited by 8 publications

References 39 publications

Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Concrete

Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Concrete

Leaching Potential and Effectiveness of Pervious Mortar Filters in Bacteria and Turbidity Removal from Surface Water

The Leaching Behavior of Pervious Mortar Used as Water Filter in Rural Areas

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