Results 31 to 40 of about 2,326 (201)

Porosity Parameters Of Cement Stone Containing Chemical Admixtures Of Different Purpose

Mokslas: Lietuvos Ateitis, 2013
The conducted research has established a complex influenceand the impact of separate chemical admixtures of differentpurpose on the parameters of the porosity of hardened cementpaste such as open and closed porosity, the average size of poresand the ...
Lukas Venčkauskas, Mindaugas Daukšys
doaj   +1 more source

The Effects of the Addition of Polyurethane–MgO Nanohybrids on the Mechanical Properties of Ordinary Portland Cement Paste

Nanomaterials, 2022
One of the most important methods of controlling the properties of concrete and cement-based materials is to control the rate and kinetics of cement hydration.
Yu Fang, Weiqing Ning, Yuan Li, Fang Li, Reza Pournajaf, Bejan Hamawandi   +5 more
doaj   +1 more source

A Validation of the Ultrasound Wave Velocity Method to Predict Porosity of Dry and Saturated Cement Paste

Advances in Civil Engineering, 2018
An approximate theoretical validation of the measured variation of ultrasound velocity with porosity of dry and saturated cement paste is proposed using finite element analysis of cement paste assuming as a multiphase composite.
Zhenting Zou, Jay N. Meegoda
doaj   +1 more source

Performance and Application of Spraying Acrylic Emulsion Cement Paste on Concrete Surface of Water Conveyance Tunnel

Renmin Zhujiang, 2023
In order to explore the applicability of acrylic emulsion cement paste in concrete surface protection of water conveyance structures,the fluidity,tensile strength,compressive strength,and flexural strength of acrylic emulsion cement paste were analyzed ...
CUI Dehao, TANG Jianhui, ZHANG Wei, TIAN Jialin, BAI Yin   +4 more
doaj  

Influences of CO₂ Absorption under Ultrasonic Vibration and Water-Reducer Addition on the Rheological Properties of Cement Paste

Applied Sciences, 2022
Research shows that ultrasonic vibratory stirring can effectively increase CO2 absorption by cement slurry. However, with the increase in CO2 absorption, the fluidity of slurry begins to decrease.
Lili Liu, Yongsheng Ji, Longhai Li, Jie Zhang   +3 more
doaj   +1 more source

Research on the Thermal Conductivity of Ultrafine Graphite and Carbon Fiber Reinforced Cement for Well Cementing

Zuanjingye yu wanjingye
To reduce the thermal resistance between the wellbore of a geothermal well and the rock formation and enhance the heat extraction capacity of the geothermal well, this paper selects graphite (SG) with excellent thermal conductivity as the heat-conducting
Donghong DANG, Zhongwei HUANG, Pengfei QI, Hongke WANG, Qiang REN, Song PENG, Xiaowei CHENG   +6 more
doaj   +1 more source

Thermoplastic Rubber (TPR) Modified by a Silane Coupling Agent and Its Influence on the Mechanical Properties of Oil Well Cement Pastes

Advances in Materials Science and Engineering, 2019
The surface hydrophilicity of thermoplastic rubber (TPR) is poor, and the effect of using it directly in oil well cement is not good. TPR was modified by different silane coupling agents, and the hydrophilicity of the modified TPR was studied by Fourier ...
Jianjian Song, Mingbiao Xu, Weihong Liu, Xiaoliang Wang, Peng Xu, Feng Huang, Yonggong Pan   +6 more
doaj   +1 more source

Complex admixtures for high-strength concrete

Journal of Civil Engineering and Management, 2002
The influence of naphthalene formaldehyde superplasticizers (NFS), lignosulfonate plasticizers (LSP) and silica fume on cement paste properties and complex usage of these admixtures for high-strength concrete production are investigated in this research.
Gintautas Skripkiūnas, Žymantas Rudžionis, Vitoldas Vaitkevičius   +2 more
doaj   +1 more source

Effect of Ultrafine Calcium Silicate on the Mechanical Properties of Oil Well Cement-Based Composite at Low Temperature

Applied Sciences, 2022
A low-temperature environment will reduce the hydration rate of oil well cement-based composites, resulting in the slow development of mechanical strength, which cannot meet the requirements of cementing operations. In order to improve the early strength
Jianglin Zhu, Xiangguang Jiang, Mingbiao Xu, Jianjian Song   +3 more
doaj   +1 more source

A numerical-statistical approach to determining the representative elementary volume (REV) of cement paste for measuring diffusivity

Materiales de Construccion, 2010
Concrete diffusivity is a function of its microstructure on many scales, ranging from nanometres to millimetres. Multi-scale techniques are therefore needed to model this parameter.
M. Z. Zhang, G. Ye, K. van Breugel
doaj   +1 more source