Effectiveness of the Concrete Equivalent Mortar Method for the Prediction of Fresh and Hardened Properties of Concrete

被引:1
|
作者
Ibrahim, Haruna [1 ]
Wardeh, George [1 ]
Fares, Hanaa [1 ]
Ghorbel, Elhem [1 ]
机构
[1] CY Cergy Paris Univ, Civil Engn Mech & Mat Lab L2MGC, F-95031 Neuville Sur Oise, France
关键词
concrete; concrete equivalent mortar; fibres; fracture properties; digital image correlation; fly ash; FLY-ASH; MECHANICAL-BEHAVIOR; FRACTURE-TOUGHNESS; ANALYTICAL-MODEL; MICROSTRUCTURE; FIBERS;
D O I
10.3390/buildings14061610
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Modern concrete mix design is a complex process involving superplasticisers, fine powders, and fibres, requiring time and energy due to the high number of trial tests needed to achieve rheological properties in the fresh state. Concrete batching involves the extensive use of materials, time, and the testing of chemical admixtures, with various methodologies proposed. Therefore, in some instances, the required design properties (physical and mechanical) are not achieved, leading to the loss of resources. The concrete equivalent mortar (CEM) method was introduced to anticipate concrete behaviour at fresh and hardened states. Moreover, the CEM method saves time and costs by replacing coarse aggregates with an equivalent sand mass, resulting in an equivalent specific surface area at the mortar scale. This study aims to evaluate the performance of fibre in CEM and concrete and determine the relationships between the CEM and the concrete in fresh and hardened states. Steel and polypropylene fibres were used to design three series of mixtures (CEM and concrete): normal-strength concrete (NSC), high-strength concrete (HSC), high-strength concrete with fly ash (HSCFA), and equivalent normal-strength mortar (NSM), high-strength mortar (HSM), and high-strength mortar with fly ash (HSMFA). This study used three-point bending tests and digital image correlation to evaluate load and crack mouth opening displacement (CMOD) curves. An analytical mode I crack propagation model was developed using a tri-linear stress-crack opening relationship. Post-cracking parameters were optimised using inverse analysis and compared to actual MC2010 characteristic values. The concrete slump is approximately half of the CEM flow; its compressive strength ranges between 78% and 82% of CEM strength, while its flexural strength is 60% of CEM strength. The post-cracking behaviour showed a significant difference attributed to the presence of aggregates in concrete. The fracture energy of concrete is 28.6% of the CEM fracture energy, while the critical crack opening of the concrete is 60% of that of the CEM.
引用
收藏
页数:20
相关论文
共 50 条
  • [31] Fresh and hardened properties of concrete made with recycled brick aggregate
    Tarek Uddin Mohammed
    Naba Uddin
    Mohammed Abdul Awal
    Journal of Material Cycles and Waste Management, 2024, 26 : 1027 - 1041
  • [32] Effect of used engine oil on properties of fresh and hardened concrete
    Hamad, BS
    Rteil, AA
    El-Fadel, M
    CONSTRUCTION AND BUILDING MATERIALS, 2003, 17 (05) : 311 - 318
  • [33] Waste tyre rubberized concrete: Properties at fresh and hardened state
    Aiello, M. A.
    Leuzzi, F.
    WASTE MANAGEMENT, 2010, 30 (8-9) : 1696 - 1704
  • [34] EFFECTS OF STEEL FIBRES ON FRESH AND HARDENED PROPERTIES OF CEMENT CONCRETE
    Ali, Saqib
    Kumar, Haresh
    Rizvi, Samar Hussain
    Raza, Muhammad Saleem
    Ansari, Jawaid Kamal
    CIVIL AND ENVIRONMENTAL ENGINEERING REPORTS, 2020, 30 (03) : 186 - 199
  • [35] Fresh and hardened properties of concrete containing cold bonded aggregates
    Thomas, Job
    Harilal, B.
    ADVANCES IN CONCRETE CONSTRUCTION, 2014, 2 (02) : 77 - 89
  • [36] Effect of metakaolin dispersion on the fresh and hardened state properties of concrete
    Paiva, H.
    Velosa, A.
    Cachim, P.
    Ferreira, V. M.
    CEMENT AND CONCRETE RESEARCH, 2012, 42 (04) : 607 - 612
  • [37] On Fresh and Hardened Properties of Lightweight Self-Compacting Concrete
    Sadrmomtazi, A.
    Arabani, H. Pourahmadi Sefat
    INTERNATIONAL JOURNAL OF ENGINEERING, 2025, 38 (04): : 767 - 784
  • [38] CURING COMPOUNDS FOR FRESH OR HARDENED CONCRETE
    FATTUHI, NI
    BUILDING AND ENVIRONMENT, 1986, 21 (02) : 119 - 125
  • [39] Effect of superplasticizers on some properties of fresh and hardened concrete mixes
    Baum, H
    Ben-Bassat, M
    ROLE OF ADMIXTURES IN HIGH PERFORMANCE CONCRETE, 1999, 5 : 482 - 492
  • [40] Fresh and Hardened Properties of Innovative Foamed-Rubberized Concrete
    Eltayeb, Essam
    Ma, Xing
    Yan Zhuge
    Youssf, Osama
    PROCEEDINGS OF THE 25TH AUSTRALASIAN CONFERENCE ON MECHANICS OF STRUCTURES AND MATERIALS (ACMSM25), 2020, 37 : 33 - 44