Results 81 to 90 of about 2,431 (140)

Stability criterion for fresh cement foams [PDF]

Cement and Concrete Research (2019) 125, p105865, 2019
We prepare and study cement foam samples with well-controlled structure, i.e. containing monodisperse bubbles. We observe that the foam structure often changes before cement setting and identify ripening as the major destabilization mechanism at stake.
arxiv  

Property enhancement and mechanism of cement-based composites from the perspective of nano-silica dispersion improvement

Case Studies in Construction Materials
Nano-silica (NS) exhibits significant potential for enhancing the properties of cement materials. However, its effectiveness in improving the properties of cement-based materials is hindered by the poor dispersion of NS within the cement matrix.
Tonghuan Zhang, Zhenjun Wang, Wei Wang, Gang Li, Haoyan Guo, Haibao Zhang   +5 more
doaj  

Comparative study of retention of fiber-reinforced post at middle and cervical one thirds of root canal cemented by polycarboxylate and zinc phosphate cements measured at different storage times

Journal of Baghdad College of Dentistry, 2014
Background: The purpose of this study was to compare regional bond strength at middle and cervical thirds of the root canal among glass fiber-reinforced composite (FRC) endodontic posts cemented with different cements, using the push-out test to ...
Saad Zabar
doaj  

Study on rheological, adsorption and hydration properties of cement slurries incorporated with EPEG-based polycarboxylate superplasticizers

Frontiers in Materials
A series of polycarboxylate superplasticizers (PCEs) with different side-chain densities, main chain polymerization degrees, and side-chain lengths were designed and synthesized using a novel highly active ethylene glycol mono vinyl ether polyethylene ...
Yunhui Fang, Yunhui Fang, Yunhui Fang, Zhaopeng Wang, Dongming Yan, Huazhen Lai, Xiuxing Ma, Junying Lai, Yi Liu, Lina Zhong, Zhanhua Chen, Xiaofang Zhang, Zhijun Lin, Dongye Wang   +13 more
doaj   +1 more source

Experimental study on preparation and optimization of high-performance cement grouts mixed with chemical additives for capsule grouting technology

Journal of Materials Research and Technology, 2022
With the development of underground space, underground construction inevitably affects the safety of surrounding structures. Capsule grouting technology (CGT) is proposed to protect adjacent structures from the impact of underground construction.
Gang Zheng, Jianyou Huang, Yu Diao, Aoyang Ma, Yiming Su, Chenlei Jiao, Hao Chen   +6 more
doaj  

Combined effect of sodium sulphate and superplasticizer on the hydration of fly ash blended Portland® cement

Materials Research, 2010
Combined effect of polycarboxylate type superplasticizer and sodium sulphate on the hydration of fly ash blended Portland® cement has been studied by using different techniques.
Mukesh Kumar, Narendra Pratap Singh, Sanjay Kumar Singh, Nakshatra Bahadur Singh   +3 more
doaj   +1 more source

Performance Analysis of Tunnel Water Plugging Engineering Slurry Based on Polycarboxylate Superplasticizer

Medžiagotyra
In response to the low efficiency of water plugging slurry in high temperature tunnel engineering, this research explores the optimization configuration of tunnel water plugging slurry.
Daiqiang ZHU, Qiao HE, Hui YANG
doaj   +1 more source

Self-Compacting Mixtures of Fair-Faced Concrete Based on GGBFS and a Multicomponent Chemical Admixture—Technological and Rheological Properties

Buildings
The use of superplasticizers in a self-compacting concrete mix without the addition of a foaming agent in practice leads to a well-known problem associated with increased air entrainment and promotes the formation of harmful large bubbles, high-void ...
Oksana A. Larsen, Svetlana V. Samchenko, Olga V. Zemskova, Andrey V. Korshunov, Artyom A. Solodov   +4 more
doaj   +1 more source

Preparation and Mechanical Properties of Graphene Oxide: Cement Nanocomposites

The Scientific World Journal, 2014
We investigate the performance of graphene oxide (GO) in improving mechanical properties of cement composites. A polycarboxylate superplasticizer was used to improve the dispersion of GO flakes in the cement.
Fakhim Babak, Hassani Abolfazl, Rashidi Alimorad, Ghodousi Parviz   +3 more
doaj   +1 more source

Redesign of Zinc Polycarboxylate Dental Cement

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017
   The formulations and the properties of the Zinc Polycarboxylate Dental Cements are reviewed then new cements of this type are prepared with modified solid part of the cement.
Saad B. H. Farid
doaj