In order to promote the resource utilization of coal gangue coal gangue with a constant replacement rate of 40% is used to replace coarse aggregate and make coal gangue concrete CGC In this study basalt fiber BF with different volume content and length was mixed into CGC and the modification effect and mechanism of BF on CGC performance
This study shows that the fluidity of coal gangue cement slurry has significant time varying characteristics which can provide effective theoretical support for the accurate application of coal
Utilization of calcined coal gangue CCG as cement replacement has the potential to relieve the environmental burden and reduce clinker consumption
In this work the impact of lab synthetic addition agent CSH PCE nanocomposites CPNs on the early hydration property of the ternary binder containing Portland cement limestone and calcined coal gangue was investigated CPNs were added in partial substitution of Portland cement by mass at 0% % % % % % and % X ray
The feasibility of preparing coal gangue based geopolymer mortar CGBGM with composite activated coal gangue was experimentally explored in this paper The effects of water to binder ratio W/B alkali content A and slag content S on the fluidity and performances of the CGBGM were experimentally investigated The ANOVA method was
In this work the impact of lab synthetic addition agent CSH PCE nanocomposites CPNs on the early hydration property of the ternary binder containing Portland cement limestone and calcined coal gangue was investigated CPNs were added in partial substitution of Portland cement by mass at 0% % % % % % and % X ray
Coal gangue is waste rock obtained from coal mining and processing China is a large coal resource country with a large quantity of coal gangue [1] On the one hand according to Chinese statistics 6 7 billion tons of coal gangue has accumulated over the years with an increasing rate of 200 million tons per year resulting in vast land occupation in mines severe
1 Introduction Coal gangue is the main solid waste produced in coal mining and preparation and its resource utilization has become a hot issue in countries that use coal as the main source of energy [1] [2] An effective resource utilization method is using coal gangue instead of crushed stone to prepare concrete which can not only solve the environmental
This study is based on the engineering application and research background of gangue fine aggregate for the 500 600 700 800 and 900 °C high temperature gangue by calcination and its phases which involve a series of changes contains a large number of active components that can improve the activity of coal gangue [11] [12] [13] [14]
This study aims to evaluate the influence of microstructural properties on the chloride diffusion resistance of alkali activated materials AAMs based on blast furnace slag and/or fly ash with
Dry mixed mortar is a mixture of cement gangue and admixture active agent which is mixed and produced by professional manufacturers after measurement and mixed with water at the construction
The results showed that the flexural and compressive strengths of concrete prepared with cement replaced by 15 wt% thermally activated coal gangue powder at 800 °C were % and % lower than
Request PDF Mechanical Properties and Chloride Permeability of Green Concrete mixed with Fly Ash and Coal Gangue A vast amount of CO2 is released in the cement production and its application
The accumulation of considerable coal gangue not only occupies a great deal of land resource but also results in serious environmental problems soil pollution air pollution and geologic hazards Stracher and Taylor 2004 The heat continues to accumulate during the accumulation process which leads to spontaneous combustion with the oxidization of coal
To investigate the feasibility and durability of aggregate concrete with coal ganguean experimental study was conducted to validate two relevant shrinkage performance and
Solid filling refers to crushing CG generated during coal mining mixing it with materials like fly ash and loess and transporting the mixture to the mined out area for backfilling [8 9]
To make a comprehensive use of coal gangue it is proposed to use this solid waste instead of fine aggregate to prepare gangue concrete pile for pile net composite foundation The influences from substitution ratio of fine coal gangue aggregate upon the mechanical parameters of concrete were analyzed through laboratory test and the lab scale model test
In order to solve the problem of efficient and effective repair after brittle cracking of concrete on road and bridge deck pavements and to consider the resource utilization of coal gangue solid waste the river sand was replaced by coal gangue and a high ductile concrete rapid repair material HDCRRM was prepared through performance optimization design
Coal gangue CG is a type of industrial solid waste produced by the process of coal excavation and separation 1 2 one ton of CG is discarded for every 10 tons of produced coal 4 5
Fine CGA and PP fiber was firstly mixed to increase the dispersion of PP fiber at 62 r/min for 30 s The fluidity of mortar was obtained by measuring the spread diameters of fresh mortar without vibration according to JC/T 985 2017 PP fiber can effectively reduce the negative effects of coal gangue on cement mortar but some reducing
The results showed that the flexural and compressive strengths of concrete prepared with cement replaced by 15 wt% thermally activated coal gangue powder at 800 °C were % and % lower than those of pure cement concrete and % and % higher than those of raw coal gangue powder concrete
Carbon and various other components in CG can be removed during calcination at the temperature range of 500 800 °C and the kaolinite in CG can also be gradually transformed into metakaolin 23 24
And the mechanical properties of the stone body are better at this time When the addition of calcined coal gangue reaches 70% the concentration of Ca 2 in the slurry system decreases the C S H produced by the early hydration reaction is less the main product is N A S H and mixed with more unreacted coal gangue pellets At this time the
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