— Introduction Fly ash is a pozzolanic materials containing aluminosilicate glass formed after the burning of pulverized coal [1] It is rich in SiO 2 Al 2 O 3 in chemical composition accounting for about 80% of the total mass Moreover mineral phase of fly ash is mainly composed of spherulitic glass phase which accounts for more than 50% of the
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— This study investigated the effect of an ultrafine composite powder UCP having a specific surface area of approximately 730 m²/kg produced by industrial ball milling ordinary blast furnace slag and fly ash at a 1 1 ratio on cement hydration and its durability
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— In this paper the influence of ultrafine fly ash on the early age property development shrinkage and shrinkage cracking potential of concrete is investigated In addition the performance of ultrafine fly ash as cement replacement is compared with
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— The grinding experiment of fly ash was carried out by using laboratory ball mill The type of the ball mill is Ф500 mm × 500 mm 48 r/min and closed circuit and the grinding media is composed by 60 kg steel balls Φ40 mm Φ50 mm Φ60 mm and Φ70 mm and 40 kg small steel forgings Φ25 mm 35 mm The weight of materials for each
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— This paper presents the effect of silica fume and nano silica used individually and in combination with the set accelerator and/or hydrated lime on the properties of class F high volume ultra fine fly ash HV UFFA cement composites replacing 80 % of cement OPC Compressive strength test along with thermogravimetric analysis
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DOI / Corpus ID 245120699; Shrinkage mitigation strength enhancement and microstructure improvement of alkali activated slag/fly ash binders by ultrafine waste concrete powder
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— In order to accelerate the sedimentation of super large scale argillized ultrafine tailings with bad features such as low settling velocity muddy overflow water and large flocculant dosage a fly ash based magnetic coagulant FAMC was used in a dynamic experimental device Nonferrous Met Soc China 26 2016 1975∠1984 Dynamic
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— Request PDF Shrinkage mitigation strength enhancement and microstructure improvement of alkali activated slag/fly ash binders by ultrafine waste concrete powder The reuse of waste concrete
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1 — Notably ultrafine ground stone ash powder with a specific surface area of 1200 m 2 /kg can react with C 3 A to produce an expansion product Calcium Carbonate Aluminate Hydrate effectively compensating for concrete shrinkage problems [10 11 12] Due to its economy and practicality chemical activation strategies have garnered significant
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— In terms of the sustained mechanical strength development of the MKPC system ultrafine fly ash is preferred over ultrafine slag powder MKPC pastes with ultrafine fly ash show greater compressive strength compared to those with ultrafine slag powder at 180 days due to denser interfaces between the ultrafine fly ash particles and hydration
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— Taking account of the condition of fly ash having large output and critical contamination in China the use of fly ash has significant technical and economic significance The use of ultrafine fly ash UFA in high performance concrete has many results [1] [2] [3] but there is little study on steam curing of UFA concrete This is due to
— The commercially available class F fly ash FA and ultrafine fly ash UFFA were used as partial replacement of cement The characteristics of the raw materials based on XRD analysis are shown in Fig 1 Table 1 summarizes the quantitative analysis of crystalline minerals of fly ash such as hematite maghemite c mullite and quartz It also
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— Coal fly ash CFA management has become a global environmental concern due to their impact on the environment and the quantities of the waste generated However the utilization of CFA as feedstock in industrial processes is considered a promising option for managing the waste sustainably The physical chemical and
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