Results 21 to 30 of about 8,674 (232)

Effect of silica fume on shrinkage of cement-based materials mixed with alkali accelerator and alkali-free accelerator

Journal of Materials Research and Technology, 2023
The current price of silica fume has a more significant advantage than cement. Application in shotcrete can improve early strength and the durability of shotcrete, and has a good synergistic effect with accelerators to promote setting and hardening. This
Zhenmin Wan, Tingshu He, Ning Chang, Renhe Yang, Heping Qiu   +4 more
doaj   +1 more source

Autogenous and drying shrinkage properties of precast recycled aggregate concrete

Case Studies in Construction Materials
Crushing prefabricated rejects into recycled aggregates (PRAs) and recasting them forms precast recycled aggregate concrete (PRAC), which offers superior mechanical properties, durability, and cost and environmental benefits compared to conventional RAC.
Ningxu Zhang, Qing Yang, Dapeng Li, Yong Yu, Xiaoyu Jiang, Jinjun Xu   +5 more
doaj   +1 more source

Effects of Shrinkage Reducing Agent and Expansive Admixture on the Volume Deformation of Ultrahigh Performance Concrete

Advances in Materials Science and Engineering, 2017
This paper investigated the influences of shrinkage reducing agent and expansive admixture on autogenous and drying shrinkage of ultrahigh performance concrete (UHPC) containing antifoaming admixture.
Su Anshuang, Qin Ling, Zhang Shoujie, Zhang Jiayang, Li Zhaoyu   +4 more
doaj   +1 more source

Shrinkage Compensation Technology of Concrete Filled Steel Tubular Structure of Large Cross-Sea Bridge

Advances in Civil Engineering, 2023
In view of the poor accuracy and unsatisfactory effect of shrinkage compensation for concrete-filled steel tubular structures of large cross-sea bridge (CSTS-LCSB), a new shrinkage compensation technology for CSTS-LCSB is proposed.
Yi Zhao, Xiao Wu
doaj   +1 more source

Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent

Materiales de Construccion, 2023
Alkali-activated slag (AAS) materials activated by NaOH or waterglass has been long-term criticized for the developed substantial shrinkage. To this regard, this paper explored MgO as both an activator and an expansive agent to prepare shrinkage-free ...
P. Chen, Q. Chen, Y. Fang, C. Wang, X. Wang, J. Li, Y. Wang   +6 more
doaj   +1 more source

On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

MATEC Web of Conferences, 2018
A model describing the variation in autogenous shrinkage and drying shrinkage of portland cement concrete, depending on the volume of aggregates and the shrinkage of hardened cement paste, is presented.
Nesvetaev Grigory, Koryanova Yulia, Zhilnikova Tatiana   +2 more
doaj   +1 more source

Autogenous shrinkage of low water-binder ratio cement pastes with supplementary cementitious materials [PDF]

, 2016
High-performance cementitious materials are sensitive to early age cracking, mainly due to the large magnitude of autogenous shrinkage, which is closely related to the internal relative humidity (RH) decrease and capillary pressure induced by self ...
De Schutter, Geert, Huang, H, Lyu, Yang, Ye, Guang   +3 more
core   +2 more sources

Mechanical Performance and Microstructure of Ultra-High-Performance Concrete Modified by Calcium Sulfoaluminate Cement

Advances in Civil Engineering, 2021
High autogenous shrinkage property is one of the disadvantages of ultra-high-performance concrete (UHPC), which may induce early age cracking and threaten the safety of concrete structure. In the present study, different dosages of calcium sulfoaluminate
Meimei Song, Chuanlin Wang, Ying Cui, Qiu Li, Zhiyang Gao   +4 more
doaj   +1 more source

Volume Stability of Cement Paste Containing Limestone Fines

Buildings, 2021
The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss of water and chemical reactions. Incorporating limestone fines (LF) as a cement replacement can affect the shrinkage of the paste.
Jamal Khatib, Rawan Ramadan, Hassan Ghanem, Adel Elkordi   +3 more
doaj   +1 more source

Autogenous shrinkage and early cracking of massive foundation slabs

Magazine of Civil Engineering
The risk of early cracking due to temperature gradients in the early period of concrete hardening of massive monolithic reinforced concrete structures determines the relevance of research into the possibilities of regulating temperature-shrinkage ...
Nesvetaev Grigory, Koryanova Yulia, Yazyev Batyr   +2 more
doaj   +1 more source