Experimental and Optimization Modeling of Room-Cured Alkali-Activated Binder Derived from Discarded Limestone Powder

作     者：Rizwan Ali, Mohammed Ibrahim, Mohammed Shameem, Mohammed Iype Joseph, Jobin Jose Bahraq, Ashraf A. 

作者机构：King Fahd Univ Petr & Minerals Res Inst Appl Res Ctr Metrol Stand & Testing Dhahran 31261 Saudi Arabia King Fahd Univ Petr & Minerals Interdisciplinary Res Ctr Construct & Bldg Mat Dhahran 31261 Saudi Arabia 

出 版 物：《JOURNAL OF MATERIALS IN CIVIL ENGINEERING》 (J. Mater. Civ. Eng.)

年 卷 期：2025年第37卷第3期

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：Applied Research Center for Metrology  Standards and Testing and Interdisciplinary Research Center for Construction and Building Materials  Research Institute 

主　　题：Alkali-activated binder (AAB) Discarded limestone powder (DLSP) Taguchi method Optimization modeling Strength Polymerization mechanism Microstructure 

摘      要：A novel attempt was made in this study to activate discarded limestone powder (DLSP), mostly comprising crystalline CaCO3. The key mix design parameters were varied to obtain superior strength and workability. For this purpose, the Taguchi method was used. The influence of each of the factors used in this study was assessed by conducting the analysis of variance (ANOVA). To further augment the compressive strength (CS) of the developed alkali-activated binder (AAB), marginal quantities of ordinary portland cement (OPC) were incorporated. In addition to monitoring strength development, selected mixes of alkali-activated paste (AAP) were prepared and utilized to examine the characteristics of the binder by means of XRD, SEM, and FTIR. Alkali-activated DLSP gained a maximum strength of more than 6 MPa when cured at room temperature conditions. Pirssonite (CaCO3Na2CO32H2O) phase was the dominant character of the AAB formed. Incorporation of OPC extraordinarily improved the morphology, mineralogy, and CS of AAB using DLSP. There was a more than fivefold increment in the strength when 30% of DLSP was replaced by OPC. Phases including Pirssonite, C-S-H, and C/N-A-S-H were formed during the polymerization of DLSP introducing OPC. It is postulated that DLSP can be utilized in synthesizing a sustainable cementitious binder that would enable mitigation of the carbon footprint associated with OPC manufacturing. The usage of universally available DLSP in the synthesis of cementitious binder could significantly boost mass production and the commercial viability of AAB. Further, such encouraged use of DLSP can also lead to enhanced prospects of upscaling the developed laboratory-scale expertise to the industrial levels.