Results 41 to 50 of about 652,428 (241)

Study on the composite fracture characteristics of filling and reinforcing cracked rock mass after high temperature damage

Deep Underground Science and Engineering, EarlyView.
Cement infill shares compressive and shear stresses during loading, while interfacial friction hinders crack propagation and reduces stress concentration, improving the rock's load‐bearing capacity. Failure modes vary with crack inclination. Unfilled specimens show four modes.
Shihao Yuan, Qiang Sun, Jianjun Hu, Liwei Zhang, Jishi Geng   +4 more
wiley   +1 more source

Mechanistic insights across curing regimes for enzymatic and biopolymer‐optimized reinforcement in rock masses

Deep Underground Science and Engineering, EarlyView.
This study examines the effects of curing temperature on the mechanical behavior of underground rock masses treated with enzyme‐induced calcite precipitation (EICP) and an innovative biopolymer‐modified EICP (BP‐EICP). Abstract Biocementation is an innovative and sustainable technique for reinforcing weak and weathered rock masses in natural and ...
Mary C. Ngoma, Oladoyin Kolawole
wiley   +1 more source

Carbon emission assessment of tunnel infrastructures: From construction to operation

Deep Underground Science and Engineering, EarlyView.
This study develops a lifecycle carbon accounting framework for tunnel infrastructures, covering design, construction, operation, maintenance, and dismantling. Applied to a subsea tunnel case, the framework reveals the carbon emission distribution among four typical tunnel types and highlights potential carbon offset methods for low‐carbon tunnel ...
Luyuan Long, Wout Broere, Xuehui Zhang, Tian Xia, Richard de Nijs   +4 more
wiley   +1 more source

Influence of cement type and admixtures on rheological properties of cement paste / Cheminių įmaišų poveikis reologinėms cemento tešlos savybėms

Engineering Structures and Technologies, 2014
The article aims to research the influence of the chemical admixtures on the rheological properties of Portland cement paste and determine their impact on the effectiveness of hydration induction period. Materials used in the study: Portland cement CEM I
Mindaugas Macijauskas, Albinas Gailius
doaj   +1 more source

The “Skin Effect” Assessment of Chloride Ingress into Concrete Based on the Identification of Effective and Apparent Diffusivity

Applied Sciences, 2022
The method of assessment of the “skin effect” for chloride ingress into concrete has been proposed, based on the inverse problem for the identification of at-surface variability of chloride diffusivity under fully saturated conditions.
Zbigniew Perkowski, Zofia Szweda
doaj   +1 more source

Uniaxial compressive strength prediction and ratio parameter optimization of titanium tailings composite backfill materials using intelligent hybrid models

Deep Underground Science and Engineering, EarlyView.
Based on the 90 datasets, ERT and four optimization algorithms were used to build four hybrid models to predict the UCS of the backfill body. The SMA‐ERT model was the most effective model, and it can reliably guide the design of the backfill ratio parameters. Abstract This study analyzed the feasibility of using titanium (Ti) tailings as a backfilling
Weijun Liu, Zida Liu, Zhixiang Liu
wiley   +1 more source

A hierarchical adaptive strategy for selecting rheological models in intelligent backfill mining pipeline transportation systems

Deep Underground Science and Engineering, EarlyView.
This graphical abstract presents a hierarchical adaptive strategy for selecting rheological models in intelligent backfill pipeline transportation. Temperature, fly ash content, and water‐cement ratio jointly influence slurry rheological nonlinearity, which is quantified using the Model Fidelity Gain (ΔR2).
Defeng Wang, Xintao Song, Aixiang Wu, Yong Wang   +3 more
wiley   +1 more source

Utilization of Iron Ore Tailings as Raw Material for Portland Cement Clinker Production

Advances in Materials Science and Engineering, 2016
The cement industry has for some time been seeking alternative raw material for the Portland cement clinker production. The aim of this research was to investigate the possibility of utilizing iron ore tailings (IOT) to replace clay as alumina-silicate ...
Li Luo, Yimin Zhang, Shenxu Bao, Tiejun Chen   +3 more
doaj   +1 more source

Deteriorated Hysteresis Behavior of Reinforced Concrete Bridge Columns With Lap‐Spliced Circular Hoop Reinforcement

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT Five lap‐spliced circular hoop (CH) concrete bridge columns, designed in accordance with the current Japanese bridge design code and Taiwan bridge design practice, were tested in this study to investigate the effects of longitudinal reinforcement and aspect ratios on deteriorated hysteresis behavior.
Ping‐Hsiung Wang, Cheng‐Yu Huang, Chiao‐Chu Tseng   +2 more
wiley   +1 more source

Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes

Polímeros, 2005
Recently, modern techniques have been applied for analysis of the influence of polymers on microstructural properties of Portland cement, such as Thermogravimetric Analyses (TG), Scanning Electronic Microscopy (SEM), Fourier Transform Infrared ...
Carlos Eduardo M. Gomes, Osny P. Ferreira   +1 more
doaj   +1 more source