scholarly journals A Comparative Study on the Mechanical Properties and Microstructure of Cement-Based Materials by Direct Electric Curing and Steam Curing

2021 ◽  
Author(s):  
Zhihan Yang ◽  
Youjun Xie ◽  
Jionghuang He ◽  
Fan Wang ◽  
Xiaohui Zeng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Pore Structure ◽  
Steam Curing ◽  
Cement Based Materials ◽  
Curing Methods ◽  
Stable Growth ◽  
Curing Method ◽  
Curing Regimes ◽  
Better Than

Direct electric curing (EC) is a new green curing method for cement-based materials that improves the early mechanical properties via the uniform high temperature produced by Joule heating. To understand the effects of EC and steam curing (SC) on the mechanical properties and microstructure of cement-based materials, the mortar was cured at different temperature-controlled curing regimes (40°C, 60°C and 80°C). Meanwhile, mechanical properties, hydrate phase and pore structure of specimens were investigated. The energy consumption of two curing methods was compared and analyzed. The results show that the EC specimens have better and more stable growth of mechanical strength. The pore structure of EC specimen is also better than that of SC specimen at different maintenance ages. However, the hydration degree and products of samples cured by EC are similar to that SC samples. The energy consumption of EC is lower than SC. This study provides an important technical support for the EC in the production of energy-saving and high early-strength concrete precast components.

scholarly journals A Comparative Study on the Mechanical Properties and Microstructure of Cement-Based Materials by Direct Electric Curing and Steam Curing

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7407
Author(s):  
Zhihan Yang ◽  
Youjun Xie ◽  
Jionghuang He ◽  
Fan Wang ◽  
Xiaohui Zeng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Hydration Degree ◽  
Steam Curing ◽  
Cement Based Materials ◽  
Curing Methods ◽  
Temperature Controlled ◽  
Stable Growth ◽  
Curing Method ◽  
Curing Regimes

Direct electric curing (EC) is a new green curing method for cement-based materials that improves the early mechanical properties via the uniform high temperature produced by Joule heating. To understand the effects of EC and steam curing (SC) on the mechanical properties and microstructure of cement-based materials, the mortar was cured at different temperature-controlled curing regimes (40 °C, 60 °C, and 80 °C). Meanwhile, the mechanical properties, hydrates and pore structures of the specimens were investigated. The energy consumption of the curing methods was compared. The results showed that the EC specimens had higher and more stable growth of mechanical strength. The hydration degree and products of EC samples were similar to that of SC samples. However, the pore structure of EC specimens was finer than that of SC specimens at different curing ages. Moreover, the energy consumption of EC was much lower than that of SC. This study provides an important technical support for the EC in the production of energy-saving and high early-strength concrete precast components.

Effect of Super-Absorbent Polymer as Admixture on the Mechanical Properties of Mortars

2011 ◽  
Vol 306-307 ◽  
pp. 1683-1687
Author(s):  
Tao Yang ◽  
Na Sun ◽  
Wen Juan Guo ◽  
Jin Zhang ◽  
Mei Shan Pei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Particles ◽  
Super Absorbent Polymer ◽  
Curing Methods ◽  
Curing Method ◽  
Absorbent Polymer ◽  
Better Than ◽  
The Way

Super-absorbent polymer particles (SAPs) were used as a self-curing admixture for mortars. The effect of SAPs on mechanical properties of mortars was investigated. The performance of the mortars with SAPs added by two different ways was tested, which showed that the way of adding dried was more feasible to application. The performance of mortars with different curing methods was also tested. The results showed that SAPs in the mortars played a role of reserving water and the mechanical properties of hardened mortars with SAPs were better than those had no SAPs and exposed to the air, which suggested that incorporating SAPs can be an effective self-curing method.

Mechanical Properties of Reactive Powder Concrete Containing Fly Ash under Different Curing Regimes

2014 ◽  
Vol 597 ◽  
pp. 320-323 ◽  
Author(s):  
De Hong Wang ◽  
Yan Zhong Ju ◽  
Wen Zhong Zheng
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Ash Content ◽  
Reactive Powder Concrete ◽  
Steam Curing ◽  
Cement Ratio ◽  
Reactive Powder ◽  
Curing Regimes

Mechanical properties of reactive powder concrete (RPC) containing fly ash were investigated under different curing regimes (standard and steam curing) in this study. The experimental results indicate that, flexural strength of RPC increased considerably after steam curing, compared to the standard curing. Steam curing had no significant effect on compressive strength of RPC. Increasing the fly ash content improved the flexural strength of RPC under all curing regimes considerably. The compressive strength reached a maximum (103.8MPa) when the fly to ash and cement ratio is 0.3.

The Effect of Super-Absorbent Polymer as a Self-Curing Admixture on the Performance of Mortars

2011 ◽  
Vol 287-290 ◽  
pp. 1241-1246
Author(s):  
Fa Qi Yu ◽  
Na Sun ◽  
Chao Deng ◽  
Jin Zhang ◽  
Mei Shan Pei
Keyword(s):  
Mechanical Properties ◽  
Average Diameter ◽  
Optimal Performance ◽  
Super Absorbent Polymer ◽  
Cement Based Materials ◽  
Different Ages ◽  
Absorbent Polymer ◽  
Better Than

Super-absorbent polymer (SAP) was used as a self-curing admixture for cement-based materials. Two types of super-absorbent polymer and effect of super-absorbent polymer on fluidity and mechanical properties of mortars were investigated. The performance of the mortars cured for different ages was tested. The results showed that SAP could play a role of reserving water and reserving water of SAP particles A with an average diameter of 180 mm was more effective than that of SAP particles B with an average diameter of 80 mm, the optimal performance of reserving water was obtained at 0.07 wt.% of SAP particles A; Mechanical properties of hardened mortars with SAP particles A were better than those with SAP particles B, the favorably experiment ratio was 0.05 wt.% of SAP particles A.

Experimental Investigation on Mix Design and Mechanical Properties of Polymer (Latex) Modified Concrete

2013 ◽  
Vol 687 ◽  
pp. 112-117 ◽  
Author(s):  
Farhad Nabavi ◽  
Shami Nejadi ◽  
Bijan Samali
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Compressive Strength ◽  
Mix Design ◽  
Modulus Of Rupture ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Antifoaming Agent ◽  
Curing Methods ◽  
Curing Method

This paper presents the experimental investigation to enhance the mechanical properties of Polymer Modified Concrete (PMC) incorporating Styrene Butadiene Rubber (SBR) and describes the potential of using PMC as a structural material. PMC has been used for many years as an over layer in the bridges deck or for the repairing the defected concrete structures subjected to marine environment. But, because of low compressive strength due to foaming phenomenon, PMC has not been considered as a structural concrete. In this study, a range of investigations including sensitivity of PMC to water cement ratio, the effect of SBR proportion on compressive strength and modulus of rupture, selection of the proper antifoaming agent, the effect of various curing methods on compressive strength, proper mix design of PMC to achieve medium to high compressive strength are carried out. Also, the instructions for casting PMC are composed which can be stated as a standard for mixing and curing procedure of PMC. Results show that increasing the proportion of latex in PMC causes the strength reduction. But, using appropriate antifoaming agent (defoamer) and proper curing method, the mechanical properties can be recovered remarkably.

scholarly journals Performance of Cement Mortar Exposed to Different Temperature and Curing Methods

2020 ◽  
Vol 6 (1) ◽  
pp. 174-185
Author(s):  
Samer Muayad Alsadik ◽  
Esraa Lutfi Ibrahim ◽  
Hussein Ali Jaber
Keyword(s):  
Mechanical Properties ◽  
Water Immersion ◽  
Concrete Strength ◽  
Climatic Conditions ◽  
Test Results ◽  
Continuous Increase ◽  
Curing Methods ◽  
Opposite Manner ◽  
Strength And Durability ◽  
Curing Regimes

Curing is an important process to achieve the specified concrete strength and durability. The objectives here is to determine the effect of four curing regimes on the development of mechanical properties for mortar specimens with mix proportions of 1:2.75 cement to sand by mass with W/C of 0.46, and with standard cube and prism dimensions, using OPC and SRPC; specimens tested under curing temperatures at 25 °C and 45 °C; to simulate the seasonal climatic conditions in Iraq. Curing methods adopted were: 1st: immersion in water, 2nd: wetting by using saturated covers, 3rd: curing by using wax-based compound, and 4th: by air curing. The specimens were examined at the ages of 3, 7, 14, and 28 days for density and mechanical properties. The study highlights that fully-saturated specimens in water is the recommended curing; as test results indicate that the highest mechanical properties were obtained. Considering the compressive strength as the criterion, curing by using wax-based compound came 2nd; and curing by saturated covers in 3rd position. This is true for temperatures at 25 °C and 45 °C; however, the experiments carried on OPC mortar show that increasing the temperature from 25 °C to 45 °C increases the early strength at 3 and 7 days by 16% and 22%, respectively; while the strengths at 14 and 28 days indicate an opposite manner; as the strength decreases when comparing the testing results at those ages by 23% and 17%. This is also valid for SRPC mortar and water-immersion curing for the same temperatures and corresponding ages; 25% and 19% increase at 3 and 7 days, respectively; but the results show that there was a continuous increase in strength at 14 and 28 days, by 29% and 33%, respectively. The study points out that immersion-curing in high temperatures is not recommended for OPC mortars after the age of 7 days; while it could be used for SRPC mortars.

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

FERRIUM S53

Alloy Digest ◽  
2008 ◽  
Vol 57 (12) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Heat Treating ◽  
Corrosion Resistant Steel ◽  
Resistant Steel ◽  
Corrosion Resistant ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Better Than

Abstract Ferrium S53 was developed for use as a structural corrosion resistant steel for aircraft landing gear. S53 has a corrosion resistance equivalent to 440C, strength equivalent to or better than 300M (AMS 6257A) and SAE 4340 (see Mechanical Properties), optimum microstructure features for maximum fatigue resistance, and a surface hardenability equal to or greater than 67 HRC for wear and fatigue. This datasheet is an update to Alloy Digest SS-942 and SS-1003. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating and machining. Filing Code: SA-589. Producer or source: QuesTek Innovations, LLC.

Comparison of different curing method for mechanical properties of self-curing agent using diapers polymer

2021 ◽  
Author(s):  
Daud Mohamad ◽  
Salmia Beddu ◽  
Ibrahim ◽  
Karim Sherif ◽  
Mahyun Zainoddin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Curing Agent ◽  
Curing Method
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