Article
Materials Science, Ceramics
Zhihang Wang, Erlei Bai, He Huang, Chaojia Liu, Tengjiao Wang
Summary: Carbon fiber reinforced geopolymer concrete (CFRGC) was prepared using slag and fly ash as cementitious materials, NaOH and sodium silicate as alkaline activators, and carbon fiber as reinforcement, in order to improve its strength and toughness under impact load at different ages. The dynamic mechanical properties of CFRGC were studied by conducting dynamic compression tests using a F 100 mm SHPB test system. The effects of age (3 d, 7 d, 28 d) and fiber content on the mechanical properties of CFRGC were analyzed, and the strengthening and toughening effects of carbon fiber on geopolymer concrete (GC) were evaluated. The results show that CFRGC exhibits strain rate effect at different ages under impact load, with the dynamic compressive strength and specific energy absorption increasing approximately linearly with the strain rate. The carbon fiber content has an influence on the mechanical properties of CFRGC, with an increase initially followed by a decrease in the dynamic compressive strength and specific energy absorption. The strain rate sensitivity of the mechanical properties also follows a similar trend with the increase in carbon fiber content. The optimal fiber content for CFRGC is 0.2%, which exhibits the best dynamic mechanical properties and the highest strain rate sensitivity. Carbon fiber has strengthening and toughening effects on both GC and ordinary Portland cement based concrete (PC), with the most significant effects observed at a fiber content of 0.2%. The strengthening and toughening effects of carbon fiber on GC are superior to those of PC. The effects of carbon fiber on GC are more pronounced at 3 d and 7 d compared to 28 d.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Chong Chen, Xihong Zhang, Hong Hao
Summary: Geopolymer concrete (GPC) has attracted attention due to its utilization of industry waste and outstanding mechanical properties. This paper presents an experimental study on the dynamic tensile properties of GPC and fibre reinforced GPC (FR-GRC) with steel and PP fibres. The addition of fibres effectively improves the ductility of GPC. Fibre stretching process contributes to crack reduction and energy dissipation. The split-tensile properties of GPC and FR-GPC are strain rate sensitive.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Khadim Hussain, Faheem Butt, Mamdooh Alwetaishi, Rana Muhammad Waqas, Fahid Aslam, Muhammad Ibraheem, Zhu Xulong, Naveed Ahmad, Rana Faisal Tufail, Muhammad Ali Musarat, Enas E. Hussein
Summary: This study investigated the performance of geopolymer concretes incorporating quarry rock dust, fly ash, and slag at different proportions, finding that an increase in quarry rock dust content can reduce workability but improve compressive, tensile, and flexural strengths within a certain range of dosage. Under elevated temperatures, the strength of QFS-GPC decreased with higher quarry rock dust content.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Fatih Kantarci, Ibrahim Turkmen, Enes Ekinci
Summary: This study aimed to enhance the performance of volcanic tuff-based geopolymer concrete under elevated temperatures by using nano-silica, micro-silica, and styrene-butadiene latex additives. The experimental results showed that the addition of micro-silica significantly improved the high-temperature performance of the concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Zhihang Wang, Erlei Bai, Biao Ren, Yan Lv
Summary: The high-temperature impact test was conducted on Basalt Fiber Reinforced Geopolymer Concrete (BFRGC) to study the effects of temperature and basalt fiber on the dynamic mechanical properties of Geopolymer Concrete (GC). The results showed that BFRGC exhibited strain rate and temperature reinforcement effects, as well as high-temperature damage and plasticizing effects. The addition of an appropriate amount of basalt fiber enhanced the dynamic mechanical properties of GC at both room temperature and high temperature, with a fiber content of 0.1% producing the best results.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Chong Lian, Yubo Wang, Shan Liu, Hong Hao, Yifei Hao
Summary: This paper presents an experimental study on the dynamic mechanical properties of alkali-activated concrete (AAC) with different strengths. The results show that the compressive and tensile properties of AAC are significantly affected by strain rate, and the strength grade also affects its strain rate sensitivity. The existing empirical relations for strain rate effect in ordinary Portland cement concrete (OPC) are not applicable to AAC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Ahmed M. Tahwia, Ashraf M. Heniegal, Mohamed Abdellatief, Bassam A. Tayeh, Mohamed Abd Elrahman
Summary: This paper investigates the effects of waste glass on ultra-high performance geopolymer concrete (UHPGC). The study finds that the addition of waste glass improves the flowability but reduces the compressive strength of the concrete. Waste glass also contributes to the durability and thermal stability of the concrete after high temperature exposure.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Weitan Zhuang, Shaohua Li, Qingliang Yu
Summary: Supplementary cementitious materials (SCMs) can replace cement in UHPC, leading to reduced CO2 emissions and construction costs. This study comprehensively investigates the influence of different SCMs on the workability, pore structure, quasi-static compressive strength, and dynamic compressive properties of UHPC paste. The results show that using ground granulated blast furnace slag (GGBS) and limestone powder (LP) increases workability but also leads to increased porosity and decreased compressive properties at higher replacement rates.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
Mohammed Alghannam, Abdulrahman Albidah, Husain Abbas, Yousef Al-Salloum
Summary: This study investigated the properties of metakaolin-based geopolymer concrete through 16 mixes, aiming to optimize the mix proportions and understand the influences of various parameters on its behavior. Insights were provided into the curing conditions, molarity, and ratios of materials, and a model for water to solids ratio based on total aggregate percentage was proposed for workable geopolymer mixes.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Construction & Building Technology
Lei Gan, Yuan Liu, Zongliang Zhang, Jun Liu, Hongjie Jin, Yiqing Sun
Summary: The mechanical properties of concrete in cold regions are significantly affected by low temperature and freeze-thaw cycles. Low temperature conditions can improve the compactness and compressive strength of concrete, while reducing the rate sensitivity of its mechanical properties. Different levels of freeze-thaw damage in concrete show decreasing gaps in mechanical properties under low temperature.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Abdulrahman Albidah, Ali S. Alqarni, Husain Abbas, Tarek Almusallam, Yousef Al-Salloum
Summary: Geopolymer or alkali-activated binders are being considered as sustainable alternatives to ordinary Portland cement. This study investigates the behavior of MK-based geopolymer concrete under ambient and elevated temperatures, with varying Na2O/Al2O3 and SiO2/Al2O3 molar ratios affecting the mechanical properties. The residual compressive strength and modulus of elasticity of geopolymer concrete after exposure to elevated temperature show good correlations with experiments.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Peng Zhang, Yaowen Sun, Jingjiang Wu, Jian Hong, Zhen Gao
Summary: This study investigates the changes in mechanical properties of nano-modified geopolymer concrete containing hybrid fibers after exposure to elevated temperature. The results show that higher temperatures significantly reduce the mechanical properties of the concrete, while increasing nano-SiO2 content can enhance its strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Construction & Building Technology
Nouran Elmesalami, Kemal Celik
Summary: Bendable concrete is a special type of high-performance concrete with significant environmental impacts due to its high OPC content. Geopolymer is considered a promising alternative to fully replace OPC in ECCs. Research on Engineered Geopolymer Composites (EGCs) is ongoing and further exploration is needed to realize their full potential.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yunchao Tang, Wanhui Feng, Wenxian Feng, Jieming Chen, Dingjing Bao, Lijuan Li
Summary: The study shows that the addition of rubber particles can significantly improve the performance of recycled concrete, but excessive rubber content can result in an excessively loose internal structure, thereby reducing its strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Nouran Elmesalami, Kemal Celik
Summary: Bendable concrete (ECC) has a high carbon footprint due to its high content of ordinary Portland cement (OPC), leading researchers to explore geopolymer composites (EGCs) as a low-carbon alternative with promising potential for ultra-high-performance concrete. While EGCs show great promise as low-carbon and ultra-high-performance concretes, further research is needed to fully realize their potential.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
