الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 90 |  |  |
| | | from | 90 | | |
Abstract
The reliability of the geopolymer concrete is an issue draws marginal attention, with regard to cement based concrete. The usage of the alkali-activated concrete can be considered as environmental friendly option compared with concreting. Geopolymers are gaining interest worldwide compared to the Ordinary Portland Cement OPC as a construction material, due to very low CO2 emission in addition to the usage of the by-product materials as the raw source of the binder.
This research consists of two phases. Phase I; aimed to study the influence of using Nano-materials on the compressive strength of twelve geopolymer mixes, composed of 50 % slag + 50 % fly ash with a variable Nano-clay NC and Carbon Nano-tubes CNTs contents. The applied percentages -as a replacement by weight of the total binder (slag and fly ash) - were (0, 2.5, 5and 7.5%) for NC and (0, 0.01 and 0.02%) for CNTs. Based on phase I investigational work, the superior compressive strength geopolymer mix was observed to study throughout the second phase, namely (2.5%N.C, 0.01%CNTs).
In Phase (II), a profound study of additional properties -i.e.; air content, flexural strength, bond strength, chloride penetration test and water penetration depth- for the resulted superior mix was carried out. Then, test results were compared with control mix.
Results revealed that, adding N.C + CNTs into geopolymer mix decreased air content by 25.93% relative to control mix, whilst increased both of flexural strength, bond strength, chloride resistance and water penetration depth by 26.3%, 32%, 29.17% and 150% respectively.