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The Durability of alkali-activated materials in Comparison with Ordinary Portland Cements and Concretes:A Review

Engineering 2020年第6期6卷 695-706页

作者： Aiguo Wang Yi Zheng Zuhua Zhang Kaiwei Liu Yan Li Liang Shi Daosheng Sun Anhui Key Laboratory of Advanced Building materials Anhui Jianzhu UniversityHefei 230022China Key Laboratory for Green and Advanced Civil Engineering materials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha 410082China Jiangsu Subote New materials Ltd.Co. Nanjing 211103China

China is the largest producer and user of ordinary Portland cement(OPC),and the rapid growth of infrastructure development demands more sustainable building materials for concrete ***-activated materials(AAMs)are a new type of energy-saving and environmentally friendly building material with a wide range of potential *** paper compares the durability of AAMs and 0 PC-based materials un der sulfate attack,acid corrosion,carb on ation,and chloride penetratio *** AAMs have shown distinct durability properties due to different compositions being formed when different raw materials are *** to the calcium(Ca)concentration of the raw materials,this paper interprets the deterioration mechanisms of three categories of AAMs:calcium-free,low-calcium,and *** found in the most recent research are highlighted,as they raise concerns regarding the consistenee and long-term properties of ***,AAMs show better durability performances than OPC-based materials in general.

关键词： alkali-activated materials Geopolymer Durability Ordinary Portland cement Deterioration mechanism

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Mitigating drying shrinkage and efflorescence in high strength alkali-activated materials through steam curing

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Low-carbon materials and Green Construction 2024年第1期2卷 110-119页

作者： Shuai Zou Bowen Xu Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Civil Engineering Design SchoolXi’an Jiaotong-Liverpool UniversitySuzhouChina

The manufacturing of Ordinary Portland Cement(OPC)significantly contributes to global carbon dioxide(CO2)emissions,necessitating the exploration of alternative binders like alkali-activated materials(AAM).Despite its environmental benefits,AAM generally faces challenges such as drying shrinkage and efflorescence,limiting its industrial *** study focuses on investigating the impact of steam curing on addressing these challenges in high strength slag-based *** results indicates that high strength AAM can be developed by carefully optimizing the activator-to-binder and water-to-binder ratios,and incorporating steam ***,a compressive strength of 112.4 MPa was achieved after one day of steam curing,compared to 100.8 MPa after 28 days of standard *** demonstrates the ability of steam curing to accelerate strength development of ***,steam curing proved to be highly effective in reducing drying shrinkage,which was decreased from 17351 microstrains to 1440 *** reduction aligns the shrinkage levels of AAM with those of OPC,addressing a major limitation of *** study also found that efflorescence was notably mitigated,with a significant reduction observed after a 24-hour steam curing *** findings highlight steam curing as a cost-effective and practical-effective method in improving the performance of *** addressing the key challenges,steam curing facilitates the broader adoption of AAM in sustainable construction practices.

关键词： alkali-activated materials Steam curing Drying shrinkage Efflorescence Low-carbon

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Resistance to acid degradation,sorptivity,and setting time of geopolymer mortars

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 781-791页

作者： Osama A MOHAMED Rania AL-KHATTAB Waddah AL-HAWAT College of Engineering Abu Dhabi UniversityAbu DhabiUnited Arab Emirates

Experimental evaluations were conducted to determine the water sorptivity,setting time,and resistance to a highly acidic environment,of mortar with alkali-activated ground granulated blast furnace slag(GBS)binder and also of combinations of fly ash and GBS *** were activated using mixtures of NaOH and Na_(2)SiO_(3)*** molarity of NaOH in the mixtures ranged from 10 mol·L^(−1)to 16 mol·L^(−1),and the Na_(2)SiO_(3)/NaOH ratio was varied from 1.5 to *** samples were produced using three binder combinations:1)GBS as the only binder;2)blended binder with a slag-to-fly ash ratio of 3:1;and 3)mixed binder with 1:1 ratio of slag to fly *** samples were mixed and cured at(22±2)°C till the day of the *** impact of activator solution alkalinity,activator ratio Na_(2)SiO_(3)/NaOH,GBS content on the rate of water absorption were *** 7,28,and 90 d of immersion in a 10%sulfuric acid solution,the resistance of a geopolymer matrix to degradation was assessed by measuring the change in sample *** influence of solution alkalinity and relative fly ash content on setting times was ***-activated mortar with a slag-to-fly ash ratio of 3:1 had the least sorptivity compared to the two other binder combinations,at each curing age,and for mortars made with each of the NaOH alkaline activator *** sorptivity decreased with age and sodium hydroxide concentrations,suggesting the production of geopolymerization *** reduction in weight of sample occurred after immersion in the strong acid H_(2)SO_(4)solution for three months,regardless of binder *** was due to the synthesis of hydration and geopolymerization products in the presence of curing water,which outweighed the degradation of the geopolymer matrix caused by sulfuric acid.

关键词： alkali-activated materials fly ash sorptivity durability of concrete sodium hydroxide sodium silicates reduction in CO_(2)emissions sulfuric acid

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