Foam Index measurements on combinations of Air Entraining Agents, Superplasticicers and Fly ash/cement/filler powder mixes

GSTDTAP > 气候变化

	Foam Index measurements on combinations of Air Entraining Agents, Superplasticicers and Fly ash/cement/filler powder mixes
	Jacobsen, Stefan; Nordahl-Pedersen, Henrik; Omer Rasool, Hawar; Lødemeø, Øyvind Olsen
	2015
出版年	2015
语种	英语
国家	挪威
出版者	NTNU
领域	气候变化
英文摘要	A series of Foam Index measurements were made with 7 different AEAs (abietic acids/resins/tall oil/tensides), 1 copolymer SuperPlaticizer, 2 different Fly Ashes, 1 blended (80/20 OPC/FA) cement, 2 different OPC and 2 inert fillers (limestone and quartz). Foam Index = FI = required dosage of AEA to produce stable foam of a particular binder in a w/p = 2.5 slurry where AEA is added dropwise to a container that is shaken and the foam observed repeatedly until stable foam is obtained. The objective was to investigate the efficiency of the different AEAs with varying Fly Ash binders and the effect of mixing sequence of AEA and SP on the problems encounterd with air entrainment with Fly Ash with variable carbon content. The results show: that the ranking of the FI of the seven AEAs are the same for different OPC/FA binders (with different carbon content); the more carbon the higher the FI, that “tensides” are more robust than “resins”, and that FI in pure OPC binders are very low and not very different for the 7 AEAs. When adding SP before AEA the negative effect of carbon on foaming is reduced for most AEAs, presumably due to adsorption of SP before AEA is introduced in the mix, whereas the FI of some (presumably non-adsorbing) AEAs is not affected by SP addition. For those AEA/FA combinations where the FI is affected by SP, adding SP with the AEA and adding SP after the AEA reduces the efficiency of the AEA. Replacing blended cement with limestone filler and quartz filler seems to affect FI in terms of the specific surface of the filler added: the more surface that is taken away the more efficient becomes the AEA. Foaming with pure water
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来源平台	Center for International Climate and Environmental Research-Oslo (CICERO)
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/2060
专题	气候变化
推荐引用方式 GB/T 7714	Jacobsen, Stefan,Nordahl-Pedersen, Henrik,Omer Rasool, Hawar,et al. Foam Index measurements on combinations of Air Entraining Agents, Superplasticicers and Fly ash/cement/filler powder mixes:NTNU,2015.