Control of cement stone structure formation by multi-walled carbon nanotubes

• 作 者: GabidullinM.G.[1]RakhimovR.Z.[1]HuzinA.F.[1]GabidullinB.M.[2]
• 机 构: Construction materials department, Kazan State University of Architecture and Engineering, Kazan 420
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

　　A two-step manufacturing technology of composite nano-modified additive was developed.At the first stage a suspension was prepared by ultrasonic dispersion of MWCNT aggregates in isopropyl alcohol.At the second stage the obtained suspension was mixed with superplasticizer over the optimal time to evaporate the residual isopropyl alcohol and get a homogeneous mixture.According to the results of optimization of the cement stone composition the optimal dosage of MWCNT was established at 0.0005% mass concentration.The acceleration of hydration processes in cement stone modified with admixture is proven, because the maximal hydration temperature was higher by 12 and 14℃ for "Graphistrength" and "Taunit", respectively, than that for the control sample.The results of comparative studies are presented for the 0.0005 and 0.05% MWCNT composite additives effect on the early process of structure formation in one-day-old cement stone.It was carried out for cleaved samples at four scales: macro, meso,micro and nano, using Merlin scanning electron microscope.