Properties of high calcium fly ash geopolymer pastes with Portland cement as an additive
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第2期
论文作者：Tanakorn Phoo-ngernkham Prinya Chindaprasirt Vanchai Sata Saengsuree Pangdaeng Theerawat Sinsiri
文章页码：214 - 220
摘 要：The effect of Portland cement(OPC) addition on the properties of high calcium fly ash geopolymer pastes was investigated in the paper.OPC partially replaced fly ash(FA) at the dosages of 0,5%,10%,and 15% by mass of binder.Sodium silicate(Na2SiO3) and sodium hydroxide(NaOH) solutions were used as the liquid portion in the mixture:NaOH 10 mol/L,Na2SiO3/NaOH with a mass ratio of 2.0,and alkaline liquid/binder(L/B) with a mass ratio of 0.6.The curing at 60 C for 24 h was used to accelerate the geopolymerization.The setting time of all fresh pastes,porosity,and compressive strength of the pastes at the stages of 1,7,28,and 90 d were tested.The elastic modulus and strain capacity of the pastes at the stage of 7 d were determined.It is revealed that the use of OPC as an additive to replace part of FA results in the decreases in the setting time,porosity,and strain capacity of the paste specimens,while the compressive strength and elastic modulus seem to increase.
Tanakorn Phoo-ngernkham1，Prinya Chindaprasirt1，Vanchai Sata1，Saengsuree Pangdaeng1，Theerawat Sinsiri2
1. Sustainable Infrastructure Research and Development Center,Department of Civil Engineering,Faculty of Engineering,Khon Kaen University2. School of Civil Engineering,Institute of Engineering,Suranaree University of Technology
摘 要：The effect of Portland cement(OPC) addition on the properties of high calcium fly ash geopolymer pastes was investigated in the paper.OPC partially replaced fly ash(FA) at the dosages of 0,5%,10%,and 15% by mass of binder.Sodium silicate(Na2SiO3) and sodium hydroxide(NaOH) solutions were used as the liquid portion in the mixture:NaOH 10 mol/L,Na2SiO3/NaOH with a mass ratio of 2.0,and alkaline liquid/binder(L/B) with a mass ratio of 0.6.The curing at 60 C for 24 h was used to accelerate the geopolymerization.The setting time of all fresh pastes,porosity,and compressive strength of the pastes at the stages of 1,7,28,and 90 d were tested.The elastic modulus and strain capacity of the pastes at the stage of 7 d were determined.It is revealed that the use of OPC as an additive to replace part of FA results in the decreases in the setting time,porosity,and strain capacity of the paste specimens,while the compressive strength and elastic modulus seem to increase.
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