Investigations of the Mechanical Properties and Durability of Reactive Powder Concrete Containing Waste Fly Ash

Du, Yong; Wang, Shiyu; Hao, Wenru; Shi, Feiting; Wang, Hui; Xing, Feng; Du, Tao

doi:10.3390/buildings12050560

Cited by 20 publications

(9 citation statements)

References 43 publications

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“…Fly ash is one of the most common mineral fillers, the effectiveness of which has been confirmed by practical experience [29,30]. Fly ash actively affects the formation of the structure of composite building materials at all stages of hydration and the structure formation…”

Section: Influence Of Fly Ash Content On Permeable Concrete Performancementioning

confidence: 89%

Experimental Study on the Mechanical Properties and Influencing Factors of Glass Fiber-Reinforced Permeable Concrete

Xu,

Ding,

Niu

et al. 2023

Materials

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In order to improve the mechanical properties and deformation characteristics of permeable concrete, glass fiber was added to this type of concrete. Based on an unconfined compressive strength test, non-contact full-field strain measurement system, and scanning electron microscopy test, the effects of aggregate particle composition, shaking time, fly ash content, fiber length, and fiber content on the strength and permeability of permeable concrete were studied. The results show that the strength and water permeability of permeable concrete are negatively correlated with an increase in shaking time. When the aggregate particle size is 5–10 mm, the permeable concrete has both good strength and permeability. Proper incorporation of fly ash improves the compactness inside the structure. The influence of different lengths of glass fiber on the strength of permeable concrete first increases and then decreases, and the permeable property decreases. With the same fiber length, the strength increases first and then decreases with an increase in the content, while the porosity and water permeability coefficient decrease. Under the test conditions, when the length of glass fiber is 6 mm, and the dosage is 2 kg/m3, the strength performance of permeable concrete is the best, and the permeability effect is good at the same time.

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Section: Influence Of Fly Ash Content On Permeable Concrete Performancementioning

confidence: 89%

Experimental Study on the Mechanical Properties and Influencing Factors of Glass Fiber-Reinforced Permeable Concrete

Xu,

Ding,

Niu

et al. 2023

Materials

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“…Moreover, the reinforced RPC's corrosion resistance can be improved with waste fly ash [12]. However, as found in Du's research [13], RPC with waste fly ash can leach out some toxic heavy metals, which will pollute the environment. Therefore, it is necessary to provide harmless materials.…”

Section: Introductionmentioning

confidence: 98%

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

2023

Self Cite

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Boiler cinder is a kind of mining waste that may cause environmental pollution. Based on this reason, a processing method needs to be carried out. In this study, the influence of CO2-cured boiler cinder on the compressive and flexural strengths of reactive powder cement concrete (RPC) under NaCl actions is investigated. The mass loss rates (MLR) and the relative dynamic modulus of elasticity (RDME) are measured to reflect the resistance of NaCl erosion. The thermogravimetric analysis (TGA), scanning electron microscope (SEM), and X-ray diffraction (XRD) spectrum are obtained for revealing the mechanism of the macro performance. Results show that the relationship between the MLR and the mass ratio of CO2-cured boiler cinder fits the quadratic function with NaCl erosion. Meanwhile, the MLR during NaCl action are decreased by increasing the amount of CO2-cured boiler cinder. The MLR range from 0% to 5.3% during NaCl action, and the decreasing rate of MLR by CO2 curing on boiler cinder is 0%–51.3%. The function of RDME and the mass ratio of CO2-cured boiler cinder accords with the positive correlation quadratic function. The mechanical strengths decrease when NaCl erosion is encountered. The mechanical strengths’ decreasing rates of RPC are elevated with the increasing number of NaCl freeze–thaw cycles and the NaCl dry–wet alternations. The increasing rates of flexural and compressive strengths of RPC by 13.1%–36.3% and 11.2%–50.4% are achieved by adding CO2-cured boiler cinder. As observed from the TGA and SEM’s results, the addition of CO2-cured boiler cinder can increase the thermogravimetric value and the compactness of hydration products.

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“…Additives and admixtures such as fiber, mineral admixtures, temperature inhibitors, and microexpansion agents have been widely used in concrete engineering, significantly improving concrete strength and durability [5][6][7][8][9][10][11]. However, concrete structures exhibit numerous cracks at an early age.…”

Section: Introductionmentioning

confidence: 99%

Study on Temperature Control and Cracking Risk of Mass Concrete Sidewalls with a Cooling-Pipe System

Chen,

Chen

2024

Buildings

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Hydration heat of early-age sidewalls can cause cracks owing to thermal stress, reducing the durability of underground space structures. The heat can be removed by the flowing water in the cooling pipe system. However, the cooling pipe may cause thermal stress due to the temperature gradient in the region adjacent to the cooling pipe, resulting in concrete cracking. To minimize the temperature peak of sidewalls and cracking risks in the region adjacent to the cooling pipe, the crack-distribution characteristics, temperature, and strain evolution of an early-age sidewall with a cooling pipe system are analyzed by concrete temperature and strain tests. Furthermore, a model that accounts for the early-age behavior of concrete and cooling-pipe effects is developed and solved. Finally, the effects of cooling-pipe parameters and ambient temperature on the sidewall’s temperature field and cracking risk are analyzed. The results indicate that the cracks emerge in the first two weeks after concrete pouring; most are vertical, and a few oblique cracks emerge in the wall corner. The tensile stress in the region adjacent to the cooling pipe gradually decreases along the flow direction. Reducing the water temperature and increasing the flow rate reduces the sidewall’s temperature peak and cooling rate. However, they increase the cracking risk in the region adjacent to the cooling pipe. When the flow rate exceeds 0.6 m3/h, further increasing the flow rate does not significantly affect the temperature field. Reducing the distance between cooling pipes reduces the temperature peak, cooling rate, and cracking risk in the region adjacent to the cooling pipe. In high-temperature environments, the cracking risk in the region adjacent to the cooling pipe increases significantly.

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Investigations of the Mechanical Properties and Durability of Reactive Powder Concrete Containing Waste Fly Ash

Cited by 20 publications

References 43 publications

Experimental Study on the Mechanical Properties and Influencing Factors of Glass Fiber-Reinforced Permeable Concrete

Experimental Study on the Mechanical Properties and Influencing Factors of Glass Fiber-Reinforced Permeable Concrete

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

Study on Temperature Control and Cracking Risk of Mass Concrete Sidewalls with a Cooling-Pipe System

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