☆ 4.7 Article

Study on the characteristics of alkali-activated fly ash-slag improved by cenosphere: Hydration and drying shrinkage

CONSTRUCTION AND BUILDING MATERIALS (2023)

Related references

Note: Only part of the references are listed.

Article Construction & Building Technology

A numerical study on chloride transport in alkali-activated fly ash/slag concretes

Qing-feng Liu et al.

Summary: In this study, a multi-phase, multi-component ionic numerical model is developed to investigate the chloride transport in alkali-activated fly ash/slag (AAFS) concretes. The results indicate that the slag content and the water to binder ratio are the dominant factors affecting chloride penetration and corrosion initiation time of steel bars in AAFS concretes.

CEMENT AND CONCRETE RESEARCH (2023)

Add to Collection

Article Construction & Building Technology

Development of fly ash and slag based high-strength alkali-activated foam concrete

Yifei Hao et al.

Summary: In this study, alkali-activated foam concrete based on fly ash and slag was developed, exhibiting high mechanical strength and stability. The use of alkali-activated materials reduces CO2 emissions, and the addition of alkali-resistant glass fibers improves the brittleness of low-density foam concrete.

CEMENT & CONCRETE COMPOSITES (2022)

Add to Collection

Article Construction & Building Technology

Hydration and phase development of recycled cement

Jose Alexandre Bogas et al.

Summary: This study provides an in-depth analysis of the rehydration behavior of recycled cement obtained by thermally activating waste cementitious materials. The study reveals that recycled cement shows a significant hydration rate after 24 hours, with a longer induction period and a late acceleration peak compared to Portland cement. The analysis also shows early development of certain phases in recycled cement paste. Additionally, the study identifies the main phase in anhydrous recycled cement and indicates a higher degree of hydration in the recycled cement paste at 28 days but a lower total volume of long-term hydrates.

CEMENT & CONCRETE COMPOSITES (2022)

Add to Collection

Article Construction & Building Technology

Evaluation of rheology and strength development of alkali-activated slag with different silicates sources

Yubo Sun et al.

Summary: This study provides a detailed investigation on the reproducibility of two groups of alkali-activated slag mixtures, focusing on both fresh properties and strength development. The results show that AAS pastes prepared with different sodium silicate solutions exhibit similar reaction kinetics, fresh properties, and strength development. However, AAS pastes made of silica fume show faster reaction and inferior rheology and strength compared to those prepared with sodium silicate solutions. This study also demonstrates the feasibility of making the same AAS paste using different types of commercial sodium silicate solutions.

CEMENT & CONCRETE COMPOSITES (2022)

Add to Collection

Article Construction & Building Technology

Physico-mechanical, thermal properties and durability of foamed geopolymer concrete containing cenospheres

Jinyan Shi et al.

Summary: In this study, cenospheres were used to replace part of fly ash in order to prepare ultra-lightweight foamed geopolymer concrete. The results showed that the addition of cenospheres improved the fluidity, setting time, mechanical properties, and thermal insulation performance of the geopolymer foams. It also improved the pore structure and reduced the sorptivity and drying shrinkage of the UFGC samples.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Add to Collection

Article Construction & Building Technology

Drying shrinkage characteristics and mechanism primary exploration of MgO-slag mortars

Hongqiang Ma et al.

Summary: This study investigates the effects of different types and contents of MgO on the properties of MgO-slag mortars and pastes, as well as the mechanism of drying shrinkage. The results show that increasing MgO activities and contents can decrease the setting time and increase the compressive strength. The compressive strength advantage of high-activity MgO is mainly seen in the early stage, while higher contents of S-MgO exhibit higher compressive strength advantage in the later stage. Additionally, the study finds that intraparticle porosity, interparticle porosity, and MgO particle size are important factors affecting the drying shrinkage. These findings provide valuable insights for the preparation of cementing materials with no length change using MgO activator.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Add to Collection

Article Construction & Building Technology

Drying shrinkage performance of Medium-Ca alkali-activated fly ash and slag pastes

Dunwen Huang et al.

Summary: This study investigates the reason why the drying shrinkage of alkali-activated fly ash and slag (AAFS) paste is more significant than that of ordinary Portland cement (OPC) paste. It is found that the long-term progress of drying shrinkage mainly depends on the viscous behaviors of the gel under capillary pore pressure. The closure of micropores and gel rearrangement in AAFS paste are more severe, resulting in obvious creep of the paste.

CEMENT & CONCRETE COMPOSITES (2022)

Add to Collection

Article Green & Sustainable Science & Technology

Utilization of surface-modified fly ash cenosphere waste as an internal curing material to intensify concrete performance

Yating Zhang et al.

Summary: This study explores the utilization of fly ash cenosphere as an internal curing material in concrete to partially replace cement. An improved surface modification process is proposed to enhance the water desorption characteristics of the cenosphere, resulting in improved mechanical properties of the concrete.

JOURNAL OF CLEANER PRODUCTION (2022)

Add to Collection

Article Construction & Building Technology

Mechanical and microstructural properties of alkali-activated fly ash-slag material under sustained moderate temperature effect

Hongqiang Ma et al.

Summary: This paper investigates the mechanical and microscopic properties of alkali-activated fly ash-slag (AAFS) materials under sustained moderate temperature effects. The results show that AAFS can maintain compressive strength even at 250 degrees C and N-A-S-H gel exhibits greater thermal stability than C-A-S-H and C-S-H gels. The study provides experimental and theoretical basis for the application of alkali-activated materials subjected to sustained moderate temperature effects.

CEMENT & CONCRETE COMPOSITES (2022)

Add to Collection

Article Construction & Building Technology

Study on the chloride ion transport mechanism of recycled mixed aggregate concrete based on evolution characteristics of pore structure

Chao Zhu et al.

Summary: The difference in pore structure characteristics is the fundamental reason for the different chloride ion transport mechanisms between recycled mixed aggregate (RMA) concrete and ordinary concrete. The study showed that the hydration layer wrapping brick aggregate prevents chloride ions from penetrating, impacting the transport performance. New mortar has weaker anti-chloride ion transport performance compared to mortar attached to brick aggregate due to the presence of more capillary and large pores.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Add to Collection

Article Construction & Building Technology

Strength development and microstructure of sustainable geopolymers made from alkali-activated ground granulated blast-furnace slag, calcium carbide residue, and red mud

Qiang An et al.

Summary: This study utilized alkali-activated ground granulated blast-furnace slag and wet-basis calcium carbide residue stabilized red mud to prepare geopolymers material. The utilization of alkali activator improved the compressive and flexural strength of geopolymers. The microstructural analysis revealed the formation of calcium aluminate hydrates and calcium silicate hydrates, contributing to the increased strength. The leaching experiment showed that toxic heavy metals levels were below the test limits, confirming the safety and feasibility of the prepared geopolymers.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Add to Collection

Article Green & Sustainable Science & Technology

Multi-criteria optimization of concrete mixes incorporating cenosphere waste and multi-minerals

Yating Zhang et al.

Summary: This study aims to develop a sustainable concrete mix by replacing part of the cement with cenosphere waste and multi-minerals. The results show that the surface-treated cenosphere offers a good internal curing effect to improve concrete performance, while the addition of cenosphere and multi-minerals also brings cost savings and has a positive impact on environmental sustainability.

JOURNAL OF CLEANER PRODUCTION (2022)

Add to Collection

Article Construction & Building Technology

Effect of active MgO on the hydration kinetics characteristics and microstructures of alkali-activated fly ash-slag materials

Hongqiang Ma et al.

Summary: The effects of active S-MgO contents, MgO types, Na2O concentrations, and alkali activator modulus on the properties of AAFS were investigated. The addition of active S-MgO reduced the total hydration heat of AAFS, while the addition of R-MgO increased it significantly. The Krstulovic-Dabic model was not completely suitable for the hydration reaction process. The addition of active MgO decreased the amount of unreacted raw materials, increased the pore volume, and enriched the micromorphology of hydration products.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Add to Collection

Article Construction & Building Technology

Microstructure of thermoactivated recycled cement pastes

Jose Alexandre Bogas et al.

CEMENT AND CONCRETE RESEARCH (2020)

Add to Collection

Article Construction & Building Technology

FT-IR study of early stages of alkali activated materials based on pyroclastic deposits (Mt. Etna, Sicily, Italy) using two different alkaline solutions

Claudio Finocchiaro et al.

CONSTRUCTION AND BUILDING MATERIALS (2020)

Add to Collection

Article Construction & Building Technology

Effects of cenosphere on the mechanical properties of cement-based composites

Wenhua Chen et al.

CONSTRUCTION AND BUILDING MATERIALS (2020)

Add to Collection

Article Construction & Building Technology

Drying shrinkage of alkali activated binders cured at room temperature

Faris Matalkah et al.

CONSTRUCTION AND BUILDING MATERIALS (2019)

Add to Collection

Article Engineering, Environmental

Effectiveness and mechanism of carbamide/fly ash cenosphere with bilayer spherical shell structure as explosion suppressant of coal dust

Xiang Wang et al.

JOURNAL OF HAZARDOUS MATERIALS (2019)

Add to Collection

Article Construction & Building Technology

Impact of graphene oxide and highly reduced graphene oxide on cement based composites

Tanvir S. Qureshi et al.

CONSTRUCTION AND BUILDING MATERIALS (2019)

Add to Collection

Article Construction & Building Technology

Effect of various glass aggregates on the shrinkage and expansion of cement mortar

Karla Gorospe et al.

CONSTRUCTION AND BUILDING MATERIALS (2019)

Add to Collection

Article Construction & Building Technology

Study on the drying shrinkage of alkali-activated coal gangue-slag mortar and its mechanisms

Ma Hongqiang et al.

CONSTRUCTION AND BUILDING MATERIALS (2019)

Add to Collection

Article Engineering, Environmental

Coal use for power generation in China

Jiahai Yuan et al.

RESOURCES CONSERVATION AND RECYCLING (2018)

Add to Collection

Article Construction & Building Technology

Fiber-reinforced cementitious composites incorporating glass cenospheres - Mechanical properties and microstructure

Asad Hanif et al.

CONSTRUCTION AND BUILDING MATERIALS (2017)

Add to Collection

Article Construction & Building Technology

Multi-scale study of high-strength low-thermal-conductivity cement composites containing cenospheres

Vanessa Rheinheimer et al.

CEMENT & CONCRETE COMPOSITES (2017)

Add to Collection

Article Construction & Building Technology

Properties investigation of fiber reinforced cement-based composites incorporating cenosphere fillers

Asad Hanif et al.

CONSTRUCTION AND BUILDING MATERIALS (2017)

Add to Collection

Article Construction & Building Technology

Internal curing of high performance concrete using cenospheres

Fengjuan Liu et al.

CEMENT AND CONCRETE RESEARCH (2017)

Add to Collection

Article Construction & Building Technology

Friedel's salt profiles from thermogravimetric analysis and thermodynamic modelling of Portland cement-based mortars exposed to sodium chloride solution

Zhenguo Shi et al.

CEMENT & CONCRETE COMPOSITES (2017)

Add to Collection

Article Construction & Building Technology

Development of ultra-lightweight cement composites with low thermal conductivity and high specific strength for energy efficient buildings

Yunpeng Wu et al.

CONSTRUCTION AND BUILDING MATERIALS (2015)

Add to Collection

Article Geosciences, Multidisciplinary

A comprehensive review on the applications of coal fly ash

Z. T. Yao et al.

EARTH-SCIENCE REVIEWS (2015)

Add to Collection

Article Construction & Building Technology

Modification of phase evolution in alkali-activated blast furnace slag by the incorporation of fly ash

Idawati Ismail et al.

CEMENT & CONCRETE COMPOSITES (2014)

Add to Collection

Article Construction & Building Technology

Mechanical and durability properties of high volume fly ash (HVFA) concrete containing calcium carbonate (CaCO3) nanoparticles

Faiz U. A. Shaikh et al.

CONSTRUCTION AND BUILDING MATERIALS (2014)

Add to Collection

Article Green & Sustainable Science & Technology

Durability and microstructure characteristics of alkali activated coal bottom ash geopolymer cement

Ilker Bekir Topcu et al.

JOURNAL OF CLEANER PRODUCTION (2014)

Add to Collection

Article Construction & Building Technology

Advances in alternative cementitious binders

M. C. G. Juenger et al.

CEMENT AND CONCRETE RESEARCH (2011)

Add to Collection

Article Construction & Building Technology

Drying and autogenous shrinkage of pastes and mortars with activated slag cement

Antonio A. Melo Neto et al.

CEMENT AND CONCRETE RESEARCH (2008)

Add to Collection

Article Materials Science, Multidisciplinary

Processing and characterization of a lightweight concrete using cenospheres

SP McBride et al.

JOURNAL OF MATERIALS SCIENCE (2002)

Add to Collection

Article Construction & Building Technology

A conceptual model of the cement hydration process

R Krstulovic et al.

CEMENT AND CONCRETE RESEARCH (2000)

Add to Collection

© Peeref 2019-2024. All rights reserved.