Pages
- 1
- 2
- document
-
Mutti, Marcello (author), Joseph, Shiju (author), Cizer, Özlem (author)The mix design of alkali-activated materials (AAMs) is developed by taking into account several interdependent parameters. Therefore, the optimization of these to achieve a robust composition might represent a great challenge. The aim of this study is to investigate and compare the influence of some key parameters on the reactivity and setting...conference paper 2021
- document
-
FRASSON, Bruna J. (author), CHERIAF, Malik (author), ROCHA, Janaíde C. (author)Addition of Portland cement in low-calcium aluminosilicate-based alkali-activated materials can provide rapid hardening at room temperature, thus modifying microstructure and mechanical properties. In the present study, the effect of Portland cement addition on alkali-activated materials, cured at room temperature, was analysed by mechanical...conference paper 2021
- document
-
Wang, Yi (author), Zhang, Mingzhong (author)Strain hardening geopolymer composites (SHGC) as a tailored group of fibre reinforced geopolymer composites are featured by large tensile strain capacity with multiple micro-cracks. This paper experimentally investigates the strain hardening behaviour of SHGC in terms of flexural stress-deflection response, failure mode and cracking, flexural...conference paper 2021
- document
-
Frasson, Bruna J. (author), Rocha, Janaíde C. (author)Release of silicon and alumina from aluminosilicate occurs at early stages of alkaline reaction. Alkalinity and different aluminosilicate could influence dissolution of particles and modify microstructure of alkali-activated systems. However, there is a lack of study regarding the effects of Portland cement (OPC) addition on alkali-activated...conference paper 2021
- document
-
Zhang, Jingxiao (author), Ma, Yuwei (author), Zheng, Jiazheng (author)The widespread application of alkali-activated fly ash/slag (AAFS) concrete requires satisfaction of a series of performance criteria both from its early age properties (e.g. workability, strength) and long-term stability. In this study, long-term (till 180 days) natural chloride diffusion tests were conducted to evaluate the chloride diffusion...conference paper 2021
- document
-
Dong, H. (author), Yao, X. (author), Burgmann, S. (author), Ye, G. (author)Each year a large amount of construction and demolition waste (CDW) is generated in the European Union. For sustainability development the CDW is recycled and re-used. To promote the use of CDW, recycled aggregates from CDW were incorporated in alkali-activated concrete (AAC), which mainly consisted of secondary materials or industrial by...conference paper 2021
- document
-
Li, Zhenming (author), Wyrzykowski, Mateusz (author), Dong, Hua (author), Zhang, Shizhe (author), Lura, Pietro (author), Ye, Guang (author)Alkali activated slag (AAS) has shown promising potential to replace ordinary Portland cement as a binder material. Synthesized from industrial by-products, AAS can show high strength, thermal resistance and good durability. However, AAS has been reported to exhibit high autogenous shrinkage. Autogenous shrinkage is a critical issue for building...conference paper 2021
- document
-
Delsaute, B. (author), Gambacorta, J. (author), Staquet, S. (author)Blended pastes composed of slag and fly ash (ratio 50:50) are used with sodium hydroxide and sodium silicate as precursors. Each composition has the same solution to binder ratio (S/B) and the Ms-modulus varies between 1.04 and 1.58. All the experiments were conducted at a constant temperature of 20°C. The physical mechanisms related to the...conference paper 2021
- document
-
Sun, Beibei (author), Ye, Guang (author), De Schutter, Geert (author)Alkali-activated materials(AAM) are known to be environmentally friendly alternatives to cement-based materials because they can potentially reduce greenhouse gas emissions and reutilize industrial by-products. However, the application of AAM is still limited by the lack of mixture design regulation. Unlike cement, the very different chemical...conference paper 2021
- document
-
Krajnović, Ivana (author), Matthys, Stijn (author)Repair mortars are costly materials with high level of Portland cement and various additives which questions their eco-efficiency. In this respect, cement free material solutions such as alkali-activated mortars based on ground granulated blast furnace slag (BFS) are gaining interest for structural repair. The aim of this research is to study...conference paper 2021
- document
-
Shi, Zhenguo (author), Lothenbach, Barbara (author)Using Al-rich supplementary cementitious materials to partially replace Portland cement is a well-established empirical approach to mitigate expansion of concrete caused by alkali-silica reaction (ASR). However, the mechanisms behind it are still not completely understood. Synthesis of ASR products in the laboratory provides a unique opportunity...conference paper 2021
- document
-
Oesch, Tyler (author), Weise, Frank (author), Marx, Heidi (author), Kositz, Mario (author), Huenger, Klaus-Juergen (author)Intensified Alkali-Silica Reaction (ASR) damage has occurred on German roadways in recent years, leading to requirements for compulsory pre-construction investigation of aggregate alkali sensitivity using concrete tests with external alkali supply. However, since these tests are time-consuming and cost-intensive, there is interest in replacing...conference paper 2021
- document
-
GevaudanE, Juan Pablo (author), Bernal, Susan A. (author)The aim of this study is to understand the corrosion mechanism of steel embedded in alkali-activated slag/metakaolin blended concretes via electrochemical testing after 407 days of exposure to a 3.5 wt.% NaCl solution, with an emphasis on characterising the material prior to the onset of corrosion. In order to accurately depict the material’s...conference paper 2021
- document
-
Liu, Qing-feng (author), Mao, Li-xuan (author), Hu, Zhi (author)Existing reinforced concrete structures experience severe durability degradation when subjected to alkali–silica reaction (ASR) and chloride attack. A special electrochemical rehabilitation treatment, containing lithium compound anolyte, has been developed to drive lithium ions into concrete as well as remove chlorides simultaneously, for...conference paper 2021
- document
-
Nguyen, Thi Nhan (author), Phung, Quoc Tri (author), Frederickx, Lander (author), Jacques, Diederik (author), Dauzeres, Alexandre (author), Elsen, Jan (author), Pontikes, Yiannis (author)This work investigates the water permeability of alkali-activated materials (AAMs), which is one of the key transport properties beside the diffusivity to assess the material durability. The AAMs were produced from granulate blast furnaces slag (BFS) and metakaolin (MK) with various water/binder ratios of 0.35, 0.45, 0.55, and 0.75, 0.85, 0.95...conference paper 2021
- document
-
Takahashi, Yuya (author), Gong, Fuyuan (author), Maekawa, Koichi (author)Using numerical simulations, this study investigated the concrete expansion damage caused by the coupled action of freeze-thaw cycles (FTC) and alkali silica reactions (ASR). In the authors’ previous experiments, it was shown that a preceding ASR definitely accelerated the succeeding expansion by FTC. Further, even if the specimens have...conference paper 2021
- document
-
Xu, Zhiyuan (author), Zuo, Yibing (author), Ye, Guang (author)In this work, a numerical model is proposed to study chloride transport in alkali-activated materials. This model is based on multiple-relaxation-time lattice Boltzmann method, where particle distribution function is introduced to simulate the chloride binding and diffusion. This model takes into account diffusion, homogenous reaction between...conference paper 2021
- document
-
Huang, Z. (author), Wang, Q (author)In this paper, the influence of sodium hydroxide and water glass of various modulus, as activators, on the compressive strength, microstructure and hydration products of two alkali-activated phosphorous slag (AAPS) with different chemical composition were studied. Water glass activation shows relatively higher later compressive strength when the...conference paper 2021
- document
-
Liang, Xuhui (author), Dong, Hua (author), Li, Zhenming (author), van Zijl, Marc Brito (author), Ye, Guang (author)This paper investigated the feasibility of using biomass fly ash (BFA) to prepare alkaliactivated slag and fly ash paste. The reference mixture was alkali-activated slag and coal fly ash (CFA) paste with a slag-to-coal fly ash ratio of 50/50. In other mixtures, coal fly ash was replaced at 40% and 100% with BFA, respectively. The results showed...conference paper 2021
- document
-
Tavasoli, S. (author), Breit, W. (author)The effect of type of activator on porosity and CO2 penetration of the alkali activated ground granulated blast furnace slag (GGBS) mortar is an important behavior which is required for designing a durable concrete mixture. This research article investigates the influence of three types of activators consisting of NaOH, Na2.nSiO2 and K2.nSiO2 on...conference paper 2021
Pages
- 1
- 2