Effects of nano-particles on improvement in wear resistance and drying shrinkage of road fly ash concrete

Gao, Yingli; He, Bei Hai; Li, Youyun; Tang, Junlei; Qu, Liangchen

doi:10.1016/j.conbuildmat.2017.06.080

Cited by 44 publications

(22 citation statements)

References 16 publications

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“…However, Gao et al [36] reported that nano-SiO 2 and nano silica carbide can aggravate the drying shrinkage when admixed in cement composites. This is mainly due to the water adsorption effect of these nanoparticles, which could absorb free water from the capillary pores in concrete.…”

Section: Nanotechnology For Cbms To Overcome Physical Deteriorationsmentioning

confidence: 99%

“…The abrasion of concrete is usually caused by the scraping, rubbing, skidding or sliding of objects on the surface of concrete [47]. Nanomaterials, such as nano-TiO 2 , nano-SiO 2 , and nanosilica carbide, have been explored in various studies to enhance the resistance of concrete to abrasion [36,48]. Gao et al [36] investigated the effect of nanosilica on the wear resistance of fly ash concrete and suggested that there was an optimal dosage for nanosilica to exhibit the beneficial influence.…”

Section: Nanotechnology For Cbms To Overcome Physical Deteriorationsmentioning

confidence: 99%

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Nanotechnology in Cement-Based Materials: A Review of Durability, Modeling, and Advanced Characterization

AlShareedah

et al. 2019

Nanomaterials

102

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In the context of increasing applications of various nanomaterials in construction, this work reviews the renewed knowledge of nanotechnology in cement-based materials, focusing on the relevant papers published over the last decade. The addition of nanomaterials in cement-based materials, associated with their dispersion in cement composites, is explored to evaluate their effects on the resistance of cement-based materials to physical deteriorations, chemical deteriorations, and rebar corrosion. This review also examines the proposed nanoscale modeling of interactions between admixed nanomaterials and cement hydration products. At last, the recent progress of advanced characterization that employs techniques to characterize the properties of cement-based materials at the nanoscale is summarized.

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Section: Nanotechnology For Cbms To Overcome Physical Deteriorationsmentioning

confidence: 99%

Section: Nanotechnology For Cbms To Overcome Physical Deteriorationsmentioning

confidence: 99%

Nanotechnology in Cement-Based Materials: A Review of Durability, Modeling, and Advanced Characterization

AlShareedah

et al. 2019

Nanomaterials

102

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“…Furthermore, an appropriate addition of fly ash could enhance the resistance of concrete to sulfate attack and chloride penetration [22][23][24], thus reducing the risk of steel corrosion [25]. Other properties such as strength [6], acid resistance [26], wear resistance [27], and leaching properties [28] could be improved by replacing part of cement with fly ash. e specific surface area of the fly ash used in current practical engineering is between 300 and 400 m 2 /kg.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Feng

Sun

Yan

2018

Advances in Civil Engineering

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In this study, the ground fly ash is made of ordinary grade I fly ash by grinding. Compared with grade I fly ash, the influence of ground fly ash on cement hydration and mechanical property of mortar was investigated. e results show that ground fly ash can improve the hydration of cement at all the ages compared with grade I fly ash, and not only does its pozzolanic reaction start earlier, but the reaction degree is higher and the speed is quicker. Before 3 days, the contribution of ground fly ash to the strength is mainly due to physical filling and microaggregate effect. After that, the contribution of pozzolanic effect to the strength becomes obvious and can significantly increase the compressive strength after 60 days and the flexural strength after 28 days. e ground fly ash is better than grade I fly ash to optimize the pore structure of hardened pastes. It can significantly reduce the number of harmful pores (>20 nm) and increase the number of harmless pores (<20 nm), which refines the pore structure and makes the structure denser.

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“…After curing in saturated lime water for 7, 28 and 56 days, respectively, the time that pulse passed through the specimens was recorded as T 2 . The damage parameter (D) was estimated by Equations (6) and (7); the damage parameter after loading was D f , and the damage parameter after healing was D h [39][40][41]. When the damage parameter decreased to a negative value (D < 0), a higher pulse velocity than that of the intact specimens was indicated.…”

Section: Active Aementioning

confidence: 99%

Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

Wang

Jiang

2020

Materials

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In this study, a new type of cement-based healing pellets (CHPs) were proposed to accelerate the healing efficiency of concrete, which was mainly based on the introduced Na2CO3 on promoting the formation of calcium carbonate (CaCO3) in cracks. The effects of Na2CO3 on the characteristics of CHPs were firstly investigated, and then the properties of cement mortar mixed with CHPs were studied quantitatively, including the workability, mechanical properties and healing ability. The results showed that higher dosages of Na2CO3 in CHPs decreased the size range of pellets and reduced the setting time, fluidity and heat of hydration of mortar. Still more, CHPs reduced the early strength of mortar but kept the intensity growth rate stable such that it had nearly no negative effect on the later strength. With the content of CHPs increasing, the strength of mortar showed a decreasing trend, while the pore-filling efficiency and strength healing rate of mortar were further improved. In addition, as a new type of self-healing pellets for concrete based on the “build-in” carbonation, CHPs improved the strength and healing effectiveness of cement mortar. When the dosage of Na2CO3 in CHPs and the content of CHPs in mortar were at 10% and 25%, respectively, mortar obtained highest strength in the later stage and the best healing effect.

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Effects of nano-particles on improvement in wear resistance and drying shrinkage of road fly ash concrete

Cited by 44 publications

References 16 publications

Nanotechnology in Cement-Based Materials: A Review of Durability, Modeling, and Advanced Characterization

Nanotechnology in Cement-Based Materials: A Review of Durability, Modeling, and Advanced Characterization

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

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