was 10% SP The knowledge on the strength and permeability of concrete containing silica fume fly ash super pozz and high slag cement could be beneficial in the utilization of these waste materials in concrete work especially on the topic of durability KEYWORDS Permeability Strength of concrete Silica fume SF Fly ash FA Super pozz
·In many emerging economies the impact of fly ash utilization for mass concrete applications considering industry practices is yet to be quantified This study quantifies the environmental and economic impacts of fly ash utilization in mass concrete considering different mix design strategies in actual practice Thirty one 31 concrete mixtures from batching plants
·Concrete has a tremendous influence on the environment since the majority of its composition is cement which is a material that emits high levels of carbon dioxide
·Development of sustainable materials has become one common goal across the globe to meet the ever increasing demand for the construction materials High volume fly ash HVFA concrete is one such sustainable construction material which utilizes fly ash in concrete as a partial replacement of cement Though the existing literature focuses abundantly on high
·A higher fly ash replacement 20% in normal MPa and high strength MPa concrete leads to a greater reduction in damages across all endpoint groups but for lower strength concrete
·A comparison between carbon emissions of portland cement concrete projects and fly ash concrete projects was conducted using data collected from 20 construction projects in New South Wales Australia
·The use of geopolymer as a cementitious material for geopolymer concrete GPC is beneficial for the sustainable development and green transformation of the construction industry Geopolymer concrete has many advantages such as high strength heat and corrosion resistance low hydration heat and carbon emissions This paper adopted the water binder
·The use of fly ash FA for the production of new concrete seems to be a promising solution for greening of construction industry However replacement of cement with supplementary cementitious materials such as fly ash influences concrete performance especially in terms of durability
·This study intends to evaluate the influence of portland cement fineness and w/c on heat of These parameters can also be used to predict concrete performance as well as for concrete quality control [16] Download Modified heat of hydration and strength models for concrete containing fly ash and slag Comput Concr 6 2009 pp 19 40
·The toughness and compressive strength of normal concrete and high volume fly ash concrete was found to enhance in the presence of slag sand Due to the addition of such aggregates by up to 10% there is an increase in compressive strength of
·High volume fly ash concrete is covered in a general way in this report; readers can consult ACI for more information APPENDIX A—RAPID QUALITY CONTROL TESTS p 54 —Loss on ignition p 54 —Carbon analysis p 54 —Particle size p 54 —Color p 55
·Four different SCMs were used as cement replacement two fly ash and two slag High SCM replacement levels tested including 80% and 100% Portland cement replacement Setting time similar to conventional mix except at high dosage of Class C fly ash Strength development highly dependent on replacement level and type of SCM Correlation between
·This paper presents the strength durability and microstructural characteristics of fly ash based geopolymer concrete in addition to red mud The study explores the influence of other parameters
·FA has been widely used as an additive cementitious material for the last several decades Many studies have applied FA in the production of construction materials such as concrete [6] [7] and mortar [8] [9] [10] Previous studies also indicated that the strength and durable properties of concrete and mortar strongly depended on the quality of FA [11] [12]
·The results indicate that the slump loss of the recycled aggregate concrete with fly ash was reduced to lower than that of the recycled aggregate concrete without fly ash when the fineness of the
·Concrete is the most widely used construction material in the world; as such the best way to promote a more sustainable construction industry is to improve the environmental performance of this material Since cement production is the main source of the high environmental impact of concrete due to the high calcination temperature that clinker requires
·Test results indicated that recycled concrete aggregate can be used as a coarse aggregate in high calcium fly ash geopolymer concretes with the 7 day compressive strengths of MPa which were slightly lower than those of high calcium fly ash geopolymer concretes containing crushed limestone
·Fly ash with spherical glass particles can play a ball effect in cement concrete which can not only reduce the water demand of cement paste under the same conditions but also improve the fluidity of concrete [5] [6]; 2 enhancing the durability of concrete Fly ash decreased the total heat of cement hydration and concrete cracks due to
·The high quality fly ash has low ignition loss high content of spherical vitreous body and high activity which will improve compressive strength of cement solidification Because the high quality fly ash with smooth surface will be uniformly filled between the cement particles to play the role of dense packing and micro aggregate and the
·However with a further increase of fly ash replacement of cement a decrease of slump value may occur in HVFA mixtures [11 15 18 23] Figure 2 summarizes the effect of the fly ash replacement ratio on the slump value of HVFA mixtures from relevant references In general replacing cement with fly ash in the range of 40% to 60% by mass provides the best
·In this study the influence of crack width cover depth and concrete quality on corrosion of steel in high performance concrete was investigated Three mixtures one control and two more containing corrosion inhibiting admixtures Calcium Nitrite and Disodium Tetrapropenyl Succinate in combination with 20% fly ash replacement with respect to
·As concrete mixed with High loss on ignition LOI based FA it absorbs more water and necessitates more chemical admixtures resulting in a strength reduction For this reason low LOI based FA was more preferable to high LOI based FA [42 43] Based on the fineness of class F FA it is classified into two components as Original Fly Ash
·Test raw materials mainly include fly ash ordinary Portland cement loess accelerating agent water reducing agent bentonite expansion agent curing agent
