کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
258950 | 503625 | 2012 | 10 صفحه PDF | دانلود رایگان |
The incorporation of mineral additions to Portland cement reduces the amount of clinker required in cement manufacture improving the eco-efficiency of this process. They also impact rheology and it may affect the interaction between superplasticizers and cements. The presented study explores the effect of limestone, fly ash and silica fume on Portland cement and the interaction of these additions with naphthalene (PNS)-, melamine (PMS)-, lignosulfonate (LS)- and polycarboxylate (PCE)-based admixtures. The adsorption isotherms, zeta potentials and rheological behaviour of the blended cements were found and compared to the same parameters in non-blended cement. The results showed that cement–superplasticizers compatibility was altered by the physical (specific surface) and chemical (surface charge) characteristics of the mineral additions studied.
Highlight
► Cements colloidal behaviour is related to their physicochemical characteristics.
► Limestone has significant affinity for the admixtures.
► Fly ashes present the greatest affinity for melamine based admixtures.
► Silica fume demands high dose of superplasticizers to improve the rheological behaviour of fresh.
Journal: Construction and Building Materials - Volume 31, June 2012, Pages 300–309