scholarly journals The Influence of Cellulose Nanocrystals on the Hydration and Flexural Strength of Portland Cement Pastes

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 424 ◽  
Author(s):  
Tengfei Fu ◽  
Francisco Montes ◽  
Prannoy Suraneni ◽  
Jeffrey Youngblood ◽  
Jason Weiss
Keyword(s):  
Flexural Strength ◽  
Portland Cement ◽  
Cellulose Nanocrystals ◽  
Cement Pastes

scholarly journals Physical Properties of Concrete Containing Graphene Oxide Nanosheets

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1707 ◽  
Author(s):  
Yu-You Wu ◽  
Longxin Que ◽  
Zhaoyang Cui ◽  
Paul Lambert
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Graphene Oxide ◽  
Flexural Strength ◽  
Portland Cement ◽  
Physical Properties ◽  
Ordinary Portland Cement ◽  
Construction Materials ◽  
Split Tensile Strength ◽  
Cement Pastes

Concrete made from ordinary Portland cement is one of the most widely used construction materials due to its excellent compressive strength. However, concrete lacks ductility resulting in low tensile strength and flexural strength, and poor resistance to crack formation. Studies have demonstrated that the addition of graphene oxide (GO) nanosheet can effectively enhance the compressive and flexural properties of ordinary Portland cement paste, confirming GO nanosheet as an excellent candidate for using as nano-reinforcement in cement-based composites. To date, the majority of studies have focused on cement pastes and mortars. Only limited investigations into concretes incorporating GO nanosheets have been reported. This paper presents an experimental investigation on the slump and physical properties of concrete reinforced with GO nanosheets at additions from 0.00% to 0.08% by weight of cement and a water–cement ratio of 0.5. The study demonstrates that the addition of GO nanosheets improves the compressive strength, flexural strength, and split tensile strength of concrete, whereas the slump of concrete decreases with increasing GO nanosheet content. The results also demonstrate that 0.03% by weight of cement is the optimum value of GO nanosheet dosage for improving the split tensile strength of concrete.

The Flexural Strength and Fracture Toughness of a Normal and a High Strength Polymer Modified Portland Cement

1984 ◽  
Vol 42 ◽  
Author(s):  
N. B. Eden ◽  
J. E. Bailey
Keyword(s):  
Flexural Strength ◽  
Portland Cement ◽  
Interfacial Shear Strength ◽  
Fracture Behaviour ◽  
High Strength ◽  
Interfacial Shear ◽  
Water Soluble ◽  
Water Soluble Polymer ◽  
Cement Pastes ◽  
Cement Ratio

AbstractA model has been developed for the flexural strength of Portland cement pastes, based upon observed fracture behaviour of both normal and high strength pastes. Fibrillar or foil-like elements pull apart at a yield stress which is characteristic of the number of elements and interfacial shear strength. The former can be maximised by using a low water/cement ratio and the latter by inclusion of water-soluble polymer, followed by suitable drying. It is proposed that this is the mechanism by which high strength may be attained in Portland cement.

scholarly journals Study on the Effect of Graphene Oxide with Low Oxygen Content on Portland Cement Based Composites

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 802 ◽  
Author(s):  
Andrius Kudžma ◽  
Jelena Škamat ◽  
Rimvydas Stonys ◽  
Andrejs Krasnikovs ◽  
Denis Kuznetsov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Portland Cement ◽  
Reference Sample ◽  
Strengthening Mechanisms ◽  
Low Oxygen ◽  
Cement Pastes ◽  
Mechanical And Physical Properties ◽  
Oxygen Ratio ◽  
Equal Density

The current study presents research into the effect of graphene oxide (GO) with a carbon to oxygen ratio of 4:1 on the fluidity, hydration, microstructure, mechanical and physical properties of Portland cement pastes and mortars. The amounts of GO investigated were 0.02%, 0.04%, and 0.06% by weight of cement, while for mortars, an extra composition with 0.1% was also prepared. According to the results, the fluidity of cement paste and mortar increased and the hydration process was slightly retarded with the addition of GO. Despite this, improvements in compressive and flexural strength were established in the mortars containing GO. The maximum effects (~22% and ~6%, respectively) were obtained with the addition of 0.06% GO. The calculation of estimated strength proportional to samples of equal density showed that for mortars cured for 7 days the gain in strength was directly related to the gain in density. For mortar samples cured for 28 days, the estimated strength was found to be significantly higher than that of the reference sample, indicating that besides density there are other factors determining the improvement in strength of mortars modified with GO. The possible structure strengthening mechanisms are discussed.

Hardened portland cement pastes of low porosity

1973 ◽  
Vol 3 (3) ◽  
pp. 279-293 ◽  
Author(s):  
Stephen Brunauer ◽  
Jan Skalny ◽  
Ivan Odler ◽  
Marvin Yudenfreund
Keyword(s):  
Portland Cement ◽  
Cement Pastes ◽  
Low Porosity

Effect of microcrystalline cellulose on geopolymer and Portland cement pastes mechanical performance

2021 ◽  
Vol 288 ◽  
pp. 123053
Author(s):  
Saulo Rocha Ferreira ◽  
Neven Ukrainczyk ◽  
Keoma Defáveri do Carmo e Silva ◽  
Luiz Eduardo Silva ◽  
Eduardo Koenders
Keyword(s):  
Portland Cement ◽  
Microcrystalline Cellulose ◽  
Mechanical Performance ◽  
Cement Pastes

Study on Waterproof and Water-Resistant Properties of Gypsum

2012 ◽  
Vol 476-478 ◽  
pp. 1585-1588
Author(s):  
Hong Pan ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Ordinary Portland Cement ◽  
Experimental Results ◽  
Softening Coefficient

The comprehensively modified effect of cement, VAE emulsion and self-made acrylic varnish on mechanical and water-resistant properties of gypsum sample was investigated and microstructure of gypsum sample was analyzed. Experimental results exhibit that absolutely dry flexural strength, absolutely dry compressive strength, water absorption and softening coefficient of gypsum specimen with admixture of 10% ordinary Portland cement and 6% VAE emulsion and acrylic varnish coated on its surface can respectively reach to 5.11MPa , 10.49 MPa, 8.32% and 0.63, respectively.

Electrochemical behavior of Portland cement pastes containing phosphonates

1995 ◽  
Vol 2 (5) ◽  
pp. 182-188 ◽  
Author(s):  
P. Gu ◽  
V.S. Ramachandran ◽  
J.J. Beaudoin ◽  
E. Quinn
Keyword(s):  
Portland Cement ◽  
Electrochemical Behavior ◽  
Cement Pastes

Early carbonation curing effects on the microstructure of high initial strength Portland cement pastes

2019 ◽  
Vol 31 (8) ◽  
pp. 382-388 ◽  
Author(s):  
Alex Neves Junior ◽  
Romildo Dias Toledo Filho ◽  
Jo Dweck ◽  
Frank K. Cartledged ◽  
Eduardo de Moraes Rego Fairbairn
Keyword(s):  
Portland Cement ◽  
Cement Pastes ◽  
Initial Strength ◽  
Carbonation Curing
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