EFFECT OF MAINTAINING TEMPERATURE ON DEVELOPMENT OF FOUNDRY SAND BASED GEOPOLYMER CONCRETE. Sachin

Sachin 1 and Er. Jatin Goyal 2 . 1. M.Tech Scholar, JCDM College of Engineering, Sirsa, Haryana. 2. Guide & Assistant Professor, JCDM College of Engineering, Sirsa, Haryana. ...................................................................................................................... Manuscript Info Abstract ......................... ........................................................................ Manuscript History


ISSN: 2320-5407
Int. J. Adv. Res. 4 (10), 696-700 697 Material Used:- The following materials have been used in the experimental study:a. Fly ash: In this experimental work, Class F Low calcium fly ash (ASTM Class F) conforming to IS:  specifications, collected from Guru Nanak Dev Thermal Power Station, India is utilized in this study. b. Fine aggregate: Zone -III locally available sand is used to confirm to IS:383-1970 having specific gravity 2. 63 and fineness modulus of 3.32. c. Foundry sand: foundry sand was used as a partial replacement of natural sand, 10%, 20%, and 30% having specific gravity 2. 65

Mixing, Casting and Maintaining:-
Mixing:-The aggregates were used in SSD [Saturated Surface Dry] condition. Mixed the aggregates and fly ash together in dry state for 3 minutes in mixer after that alkaline solution was added in dry material and mix for another minutes. The alkaline solution prepared 24 hrs prior to use.
Casting:-The standard moulds of size 150mmX150mmX150mm were used for casting. The moulds were cleaned and oil was applied on all sides of moulds before casting. The concrete was poured in three layers in mould. The table vibrator was used for compaction.
Maintaining:-After casting the specimens were placed in oven for 24 hrs. The concrete was de-moulded and then placed at room temperature. For ambient maintaining specimen were placed in room temperature after casting.
Testing:-After mixing, casting and maintaining the specimens were tested. The cubes of size 150x150x150mm were casted and tested. These cubes were tested by CTM machine. The test samples were placed in the compression testing machine and load was applied to the cross section of specimen gradually until the cube failed. The load at the failure divided by area of cube gives the compressive strength.

Experimental Work:-
In this research the total no. of 72 specimens was cast and tested, 36 for 7 days and 36 for 28 days. In this concrete we use fly ash instead of cement along with alkaline solution, coarse aggregate, and fine aggregate. Maintaining is done at ambient maintaining, 60℃ and 90°C. In this research black foundry sand or waste foundry sand was used, the foundry sand is replaced with normal sand to 10%, 20% and 30%. The engineering properties of aggregates and concrete were tested according to the Indian Standards. For testing of compressive strength of concrete, 150mmX150mmX150mm cubes were casted and tested. The compressive strength of concrete was measured at 7 days and 28 days.

Discussion:-
It has been clearly shown by the above mentioned results that the Compressive strength of M20 geo-polymer concrete at 7 day is maximum at 10% replacement with foundry sand at 90° C which is 18.5 Kg/m 3 and the compressive strength of 7 days is minimum at 10% replacement with foundry sand at ambient temperature which is 13 kg/m 3 . The Compressive strength of M20 geo-polymer concrete at 28 day is maximum at 10% replacement with foundry sand at 90° C which is 26 Kg/m 3 and the compressive strength of 28 days is minimum at 30% replacement with foundry sand at ambient temperature which is 18 kg/m 3