RETRACTED ARTICLE: Fuzzy logic-based prediction of compressive strength of lightweight geopolymers
- PDF / 585,552 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 79 Downloads / 159 Views
ORIGINAL ARTICLE
Fuzzy logic-based prediction of compressive strength of lightweight geopolymers Ali Nazari
Received: 12 April 2012 / Accepted: 21 June 2012 Springer-Verlag London Limited 2012
Abstract In the present work, compressive strength of lightweight inorganic polymers (geopolymers) produced by fine fly ash and rice husk–bark ash together with palm oil clinker (POC) aggregates has been investigated experimentally and modeled based on fuzzy logic. To build the model, training, validating and testing were conducted using experimental results from 144 specimens. The used data in the ANFIS models were arranged in a format of six input parameters that cover the quantity of fine POC particles, the quantity of coarse POC particles, the quantity of FA ? RHBA mixture, the ratio of alkali activator to ashes mixture, the age of curing and the test trial number. According to these input parameters, in the model, the compressive strength of each specimen was predicted. The training, validating and testing results in the model have shown a strong potential for predicting the compressive strength of the geopolymer specimens in the considered range. Keywords Ceramic-matrix composites (CMCs) Strength Fuzzy logic
1 Introduction Inorganic polymers, also known as geopolymers, are X-ray amorphous materials, usually aluminosilicates, composed of a network of randomly arranged silicate and aluminate tetrahedra in conjunction with charge-balancing alkali metal cations [1]. A. Nazari (&) Department of Materials Science and Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran e-mail: [email protected]
The compressive strength of an inorganic polymer depends on both the ratio of Si/Al and the types of the utilized raw material. Fly ash (FA) is recently used as a source material to produce geopolymer because of its suitable chemical composition along with favorable size and shape [2, 3]. Fly ash is a solid, fine-grained material resulting from the combustion of pulverized coal in power station furnaces. The material is collected in mechanical or electrostatic separators. The term fly ash is not applied to the residue extracted from the bottom of boilers. Fly ashes capable of reacting with Ca(OH)2 at room temperature can act as pozzolanic materials. Their pozzolanic activity is attributable to the presence of SiO2 and Al2O3 in amorphous form. Fly ashes are particularly rich in SiO2, Al2O3 and Fe2O3 and also contain other oxides such as CaO, MgO, MnO, TiO2, Na2O, K2O and SO3. Fly Ash with a high content of CaO (15–40 %) may be regarded as potentially hydraulic and capable of causing unsoundness in mortars and concrete [4]. Rice husk–bark ash (RHBA) is a solid waste generated by biomass power plants using rice husk and eucalyptus bark as fuel. The power plant company providing RHBA for this research reported that about 450 tons/day of RHBA is produced and discarded. The major chemical constituent of RHBA is SiO2 (about 75 %) [5, 6]. Therefore, blending FA and RHBA can adjust the ratio of Si/Al as required. In th
Data Loading...
