Abstract
In this study effect of water-cement ratio (W/C) on the characteristic properties of multiwalled carbon nano tube reinforced concrete is analyzed. Five concrete mixtures of different water-cement ratio (W/C) with and without carbon nano tubes (CNTs) were prepared. W/C of 0.40, 0.45, 0.48, 0.50 and 0.55 were used while quantity of carbon nano tube (CNT) was fixed at 1% by weight of cement (wbc). Ratio of cement, sand and aggregates was also fixed at 1: 1.76:2.66 in all mixes. For maintaining workability 0.5% polycarboxlate based superplasticizer wbc was added in all mixes.. The workability of carbon nanotube reinforced concrete (CNTC) reduced by 60% and W/C=0.50 was found ideal for slump as well as strength. At this W/C compressive strength for CNTC increased by 7.20%, split tensile strength increased by 25.75% and flexural strength increased by 3.87%.
Highlights
Functionalities of concrete improved with addition of nano materials
At water-cement ratio (W/C) =0.50 carbon nanotube reinforced concrete (CNTC) didn’t attained flow state like that of reference concrete because the some water was entrapped in agglomerates due to which slump was less than reference concrete
Its observed that the workability of CNTC reduced by 60% in comparison to reference concrete at a particular W/C ratio as observed from table II and figure 1
Summary
Functionalities of concrete improved with addition of nano materials. Incorporation of nano materials in concrete with advancement in nano technology resulted in nano modified concrete. CNTs exhibit a low density even at high aspect ratio They provide large interfacial contact area in matrix with- out much weight penalty like conventional fibers, reinforce concrete more efficiently [8, 9, 10]. No relationship between W/C and characteristic strengths of concrete is derived till Considering it as a difficulty for researchers the authors has taken an initiative to investigate role of water-cement (W/C) ratio and its influence on fresh and hardened properties of CNT reinforced concrete. For this cause concretes with different W/C ratio were characterized bearing 1% on pristine multi walled CNTs by weight of cement (wbc). First part of result and discussion compares characteristics properties of reference concrete and CNT reinforced ConcreteWhile in second part relationship between W/C ratio and characteristics properties of CNT reinforced Concrete is obtained
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