Ramya, Madhuri B.
Multi-response optimization of mechanical properties of geopolymer concrete developed using fly ash and Alccofine 1203 - Vol.97(3), Mar - Mumbai ACC LTD 2023 - 35-45p.
This paper presents the multi-response optimization of various parameters influencing the mechanical properties of geopolymer concrete. Geopolymer concrete is a sustainable concrete which is prepared by completely replacing ordinary Portland cement (OPC) with fly ash and Alccofine 1203. The main aim of the work is to produce a M30 grade sustainable geoploymer concrete. The binder consists of only fly ash and Alccofine but no OPC, this makes it a sustainable concrete. The number of trials to be conducted are 54 (6 × 3 × 3) as there are six different values for percentage of Alccofine (A), three different values for molarity of NaOH (M) and ratio of Na2SiO3 to NaOH (R) each. But using optimization has reduced the number of trials to 18, nearly 66.67 %, which is remarkable. This saves time, money, resources and man power. And moreover, the percentage error between the predicted values and the experimental results is less than 2 % in majority of the results. The parameters such as proportions of Alccofine and fly ash, molarity of NaOH and the ratio of Na2SiO3 to NaOH are set at their optimum levels to develop a basic M30 grade geopolymer concrete. Initially, the design of experiments (DOEs) is done in Taguchi method using the standard L18 orthogonal array consisting of three factors with different number of levels. After studying the influence of all the variables on individual responses (mechanical properties), the multi-response optimization is performed by using the desirability method, to find out the proportions of all the variables to get the desired responses. The responses considered are compressive strength, split tensile strength, flexural strength, modulus of elasticity (both static and dynamic) and ultrasonic pulse velocity (UPV). The final factors arrived after optimization is 11.6 % of Alccofine in total binder, 12 M NaOH and Na2SiO3 to NaOH ratio of 1.5.
Civil Engineering
Multi-response optimization of mechanical properties of geopolymer concrete developed using fly ash and Alccofine 1203 - Vol.97(3), Mar - Mumbai ACC LTD 2023 - 35-45p.
This paper presents the multi-response optimization of various parameters influencing the mechanical properties of geopolymer concrete. Geopolymer concrete is a sustainable concrete which is prepared by completely replacing ordinary Portland cement (OPC) with fly ash and Alccofine 1203. The main aim of the work is to produce a M30 grade sustainable geoploymer concrete. The binder consists of only fly ash and Alccofine but no OPC, this makes it a sustainable concrete. The number of trials to be conducted are 54 (6 × 3 × 3) as there are six different values for percentage of Alccofine (A), three different values for molarity of NaOH (M) and ratio of Na2SiO3 to NaOH (R) each. But using optimization has reduced the number of trials to 18, nearly 66.67 %, which is remarkable. This saves time, money, resources and man power. And moreover, the percentage error between the predicted values and the experimental results is less than 2 % in majority of the results. The parameters such as proportions of Alccofine and fly ash, molarity of NaOH and the ratio of Na2SiO3 to NaOH are set at their optimum levels to develop a basic M30 grade geopolymer concrete. Initially, the design of experiments (DOEs) is done in Taguchi method using the standard L18 orthogonal array consisting of three factors with different number of levels. After studying the influence of all the variables on individual responses (mechanical properties), the multi-response optimization is performed by using the desirability method, to find out the proportions of all the variables to get the desired responses. The responses considered are compressive strength, split tensile strength, flexural strength, modulus of elasticity (both static and dynamic) and ultrasonic pulse velocity (UPV). The final factors arrived after optimization is 11.6 % of Alccofine in total binder, 12 M NaOH and Na2SiO3 to NaOH ratio of 1.5.
Civil Engineering