Results 31 to 40 of about 89,639 (290)

Effects of Chloride ions on Carbonation Rate of Hardened Cement Paste by X-ray CT Techniques [PDF]

, 2016
Corrosion of steel bars in concrete structures is initiated as a result of concrete carbonation and/or chloride intrusion, and influenced by their interaction.
Castellote, Du, Han, Han, Han, Haque, Hobbes, Jian-bin Chen, Jun-zhe Liu, Kuosa, Kwon, Liu, Lu, Meira, Ming-fang Ba, Pedro, Ramezanianpour, Reddy, Rougelot, Song, Song, Song, Sugirama, Suryavanshi, Torgal, Tritthart, Vilain, Yang, Yin-gang Du, Yoon, Younsi, Zhi-min He, Zhou, Zitrou   +33 more
core   +1 more source

Microstructure evolution of hydrated cement pastes [PDF]

Physical Review E, 2005
We propose an original method based on both proton nuclear magnetic relaxation dispersion and high-resolution NMR spectra to investigate the microstructure of synthesized Ca3SiO5-hydrated cement paste. This method allows a clear assessment of the local proton chemical sites as well as the determination of dynamical information of moving proton species ...
Plassais, A., Pomies, M.P., Lequeux, N., Korb, J.P., Petit, D., Barberon, F., Bresson, B.   +6 more
openaire   +3 more sources

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

A Preliminary Study on Cracking Tendency of Cement Paste Incorporating High Calcium Fly Ash [PDF]

, 2015
Fly ash is a waste material from burning coal that can be used to reduce the amount of cement in making concrete and to improve the characteristics of concrete.
Antoni,, GOENAWAN, VERRYANTO, Hardjito, Djwantoro   +2 more
core   +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

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

Optimization of Mixture Proportions for Concrete Pavements—Influence of Supplementary Cementitious Materials, Paste Content and Aggregate Gradation [PDF]

, 2012
The ultimate goals of this study included investigation of the optimal ranges for paste content, amount of cementations materials and aggregate gradation for concrete paving mixtures.
Olek, Jan, Rudy, Adam
core   +2 more sources

Investigation of the Incompatibilities of Cement and Superplasticizers and Their Influence on the Rheological Behavior [PDF]

, 2020
The rheological behavior of cement paste and the improvement of its flowability takes center stage in many research projects. An improved flowability can be achieved by the addition of superplasticizers (SP), such as polycarboxylate ethers (PCE).
Jakob, Cordula, Jansen, Daniel, Neubauer, Jürgen, Pott, Ursula, Stephan, Dietmar   +4 more
core   +2 more sources

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

Adding limestone fines to reduce heat generation of curing concrete [PDF]

, 2012
It is well known that the heat generation of curing concrete may be reduced by decreasing the cement paste volume of the concrete. However, as the cement paste must be more than sufficient to fill the voids between aggregate particles, the cement paste ...
Chen, JJ, Kwan, AKH
core   +1 more source