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·The alkali activation of fly ash and slag individually as single precursors each have specific challenges Alkali activated fly ash usually requires curing at elevated temperatures to develop strength which is a potential barrier to widespread use in the concrete industry [17]
·Interestingly researchers 9 have pointed out that the reduced apparent importance of fly ash initial alkali content on CPT expansion measurements is likely attributed to test conditions such
Request PDF On Feb 1 2023 Wanli Wang and others published Workability rheology and geopolymerization of fly ash geopolymer Role of alkali content modulus and water binder ratio Find
·An optional requirement for Class F fly ash is to limit its alkali content to % maximum Class C fly ash which has usually higher lime CaO content than Class F is considered less effective to prevent ASR unless a higher replacement of cement is used ASTM C441 is used to evaluate fly ash with a 75% reduction in expansion at 14 days
·Resource utilization of municipal solid waste incineration fly ash cement and alkali activated cementitious materials A review Author links open overlay panel Jun Liu a Zhengdong Wang a From the particle size of MSWIFA the content of medium and fine particles <3 μm is higher than that of Portland cement Liu et al 2021
·In the present paper the alkali activation of a fly ash with high concentration of activator has been studied and the similarity of the process compared with the alkaline activation of metakaolin has been established 2 Methods For all open access content the Creative Commons licensing terms apply
·The effect of main synthesis parameters like metal alkali content Na 2 O/Al 2 O 3 silica/alumina content SiO 2 /Al 2 O 3 fly ash to sand ratio and water to geopolymer solid ratio was studied Further parameters such as curing duration and temperature on compressive strength and the development of microstructural characteristics of fly
·Keywords Fly ash based alkali activated materials Fly ash Alkali activator Compressive strength Active calcium A fly ash based alkali activated material FAAM is an important member of the alkali activated geopolymeric family The compressive strength is one of most important mechanical properties for FAAMs in its use as a construction
·Secondly high fly ash content or alkali equivalent rendered concrete porous and loose In the early stages it could absorb more water to improve the quality of concrete The interior fissures in concrete progressively grew deeper with the increase of freeze thaw cycles and the mortar in the hole crumbled away causing a greater relative mass
·1 Introduction It is widely recognized that cement production is an energy intensive process with high consumption of raw materials and it is also one of the main sources of global CO 2 emission [1] It is reported that replacing 30% cement with fly ash can reduce 23% CO 2 emission and 21% energy consumption [2] Therefore alkali activated materials are
·In alkali activated fly ash the dominant gel is N A S H whereas alkali activated slag exhibits a structure primarily dominated by C A S H gel The effects of ground granulated blast furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient
·This study uses fly ash to replace partial cement NaOH is used to increase alkali content of cement to % Na 2 O and LiNO 3 are added separately to obtain several Li/ Na K molar ratios to fabricate cement specimens cured at 38 °C in a 100% relative humidity environment This study aims to observe the diachronic changes of water soluble
·This review focuses on the impact of 11 factors such as class F Fly Ash FA characteristics fineness SiO 2 /Al 2 O 3 ratio and iron content sodium based alkaline activators parameters such as molarity of sodium hydroxide SH Silicate Modulus SM of sodium silicate SS solution ratio of SS/SH solution alkaline liquid to binder ratio
·Based on a review of the database the binder content was selected The majority of the formerly published fly ash based alkali activated concrete mixes Table employed a 400 420 kg of fly ash content Considering the median value the total fly ash content is taken as 410 kg in the mix designs a
·Increasing either the added water dosage or fly ash content resulted in lower amounts of cracks in the tested alkali activated concrete mixtures and at the same time in reduced autogenous volume changes in the corresponding alkali activated paste mixtures; this strongly suggests that shrinkage is an important contributing factor in the early cracking
·Composites that use fly ash and slag as alkali activated materials instead of cement can overcome the defects and negative effects of alkali activated cementitious materials prepared with the use of an alkali activated material In this study fly ash and slag were used as raw materials to prepare alkali activated composite cementitious materials Experimental
Sodium and potassium are the common alkalis present in fly ash Excessive amounts of fly ash alkalis can cause efflorescence problems in concrete products and raise concern about the effectiveness of the fly ash to mitigate alkali silica reaction ASR The available alkali test which is commonly used to measure fly ash alkali takes approximately 35 days for execution and
·The widespread application of alkali activated fly ash/slag AAFS concrete requires the satisfaction of a series of performance criteria both from its early age properties workability strength and long term stability [12] found that by increasing fly ash content AAFS mortars exhibited increased slump flow and prolonged setting
·When alkaline activators and slaked lime act together on slag and fly ash they can trigger a series of alkali activation reaction processes which consists of two core phases firstly in the alkaline environment the key components inside slag and fly ash such as SiO 2 Al 2 O 3 etc go through an initial depolymerization reaction phase
·The Class F fly ash used in this experiment was obtained from the Huaneng Power Plant in Qingdao Shandong Province China It has a specific surface area of 517 m 2 /kg and an apparent density of g/cm 3 Its chemical composition is listed in Table 2 The total Si oxide and Al oxide content of the fly ash is %
·Treatment of municipal solid waste incineration fly ash State of the art technologies and future perspectives Author links open overlay panel Yuying Zhang a Lei Wang b a high alkali content pH was generally observed because the hydrated lime or sodium carbonate were usually used for acid gas neutralization Cristelo et al
·Although a lower ratio of Na/fly ash can be achieved by either a higher fly ash content or a lower NaOH concentration the latter is preferred due to the environmental issues pertaining to NaOH production McLellan et al 2011; Mohammadi et al 2023 Therefore it seems innovative to assess the effect of NaOH concentration on the performance
·contained moderately reactive fine aggregate and high alkali fly ash from Ottumwa Generating Station OGS A total of nine pavement sites were selected to be evaluated This study investigated the test methods used to determine the alkali content of fly ash It also evaluated if high alkali fly ash exacerbates alkali silica reaction in
