Abstract
One of the significant characteristic material needed to consider is durability. Sulphate ion contained in soil is one of aggressive agents that could cause degradation of concrete members which led to loss of compressive strength. The current research is to elaborate the effect of activator to binder ratio on the compressive strength of the fly ash based geopolymer mortar in the sulphate environment. Two different types of geopolymer mortar were casted i. e. mortar made of 100% fly ash and mortar contained 95% fly ash + 5% slaked lime. The fly ash used in this research is classified as F fly ash from the Mpanau power plant the variation of activator to binder ratio of 0. 40; 0. 50; and 0. 60, and water/solid ratio variations of 0. 32, 0. 34 and 0. 36. The composition of sulfuric acid was by 5% of the sample volume. Geopolymers mortar compressive strength test is conducted on the immersed samples in a solution of 5% sulfuric acid with age of 0, 7, 14, 28, 56, and 84 days, respectively. The compressive strength test results showed that the highest compressive strength of geopolymers mortar (resistant to sulfuric acid attack) was geopolymers mortar made from fly ash with activator to binder ratio 0. 60, water / solid ratio 0. 32, and percentage of lime to binder 5% at the age of 84 days.
Highlights
A lot of investigations has been conducted in order to find out mixing technology of cement based mortar by adding admixture agent as compliment to reduce cement use without ignoring the characteristics of cement mortar [1]Geopolymers mortar is made of fine aggregate, fly ash, water and alkaline activator
Geopolymer mortar is a promising material in order to use as patching repair agent due to its highly beginning compressive strength, low permeability, high resistant of fire and aggressive ion, high compressive strength, and low shrinkage compared to conventional cement mortar [2], [3]
While it is compared to geopolymer mortar made of only fly ash, the compressive strength of mortar is reducing for approximately 17 % up to 19 %
Summary
A lot of investigations has been conducted in order to find out mixing technology of cement based mortar by adding admixture agent as compliment to reduce cement use without ignoring the characteristics of cement mortar [1]Geopolymers mortar is made of fine aggregate, fly ash, water and alkaline activator. Geopolymer mortar is a promising material in order to use as patching repair agent due to its highly beginning compressive strength, low permeability, high resistant of fire and aggressive ion, high compressive strength, and low shrinkage compared to conventional cement mortar [2], [3]. Durability characteristic of used material is to resist sulphate attack in the soil and chloride ion attack in the groundwater [4]–[6]. Every single deterioration of structural element is always related to durability quality of the material. The general physical damage is by showing cracks on the materials[6] These cracks will induce increasing permeability and flow path of material. Increasing permeability of mortar and concrete tends to increase penetration of aggressive agent such as chloride ion into the structural element[7]
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