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.

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.

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.

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.

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.

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.

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

Effect of steam curing regimes on temperature and humidity gradient, permeability and microstructure of concrete

2021 ◽  
Vol 281 ◽  
pp. 122562
Author(s):  
Jinyan Shi ◽  
Baoju Liu ◽  
Feng Zhou ◽  
Shuai Shen ◽  
Aofei Guo ◽  
...  
Keyword(s):  
Steam Curing ◽  
Humidity Gradient ◽  
Temperature And Humidity ◽  
Curing Regimes

scholarly journals Comparison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1745
Author(s):  
Tamaki Hada ◽  
Manabu Kanazawa ◽  
Maiko Iwaki ◽  
Awutsadaporn Katheng ◽  
Shunsuke Minakuchi
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Water Sorption ◽  
Water Solubility ◽  
Flexural Modulus ◽  
Manufacturing Method ◽  
Heat Curing ◽  
Significant Difference ◽  
Cad Cam ◽  
Curing Method

In this study, the physical properties of a custom block manufactured using a self-polymerizing resin (Custom-block), the commercially available CAD/CAM PMMA disk (PMMA-disk), and a heat-polymerizing resin (Conventional PMMA) were evaluated via three different tests. The Custom-block was polymerized by pouring the self-polymerizing resin into a special tray, and Conventional PMMA was polymerized with a heat-curing method, according to the manufacturer’s recommended procedure. The specimens of each group were subjected to three-point bending, water sorption and solubility, and staining tests. The results showed that the materials met the requirements of the ISO standards in all tests, except for the staining tests. The highest flexural strength was exhibited by the PMMA-disk, followed by the Custom-block and the Conventional PMMA, and a significant difference was observed in the flexural strengths of all the materials (p < 0.001). The Custom-block showed a significantly higher flexural modulus and water solubility. The water sorption and discoloration of the Custom-block were significantly higher than those of the PMMA-disk, but not significantly different from those of the Conventional PMMA. In conclusion, the mechanical properties of the three materials differed depending on the manufacturing method, which considerably affected their flexural strength, flexural modulus, water sorption and solubility, and discoloration.

Effect of the Short Fiber on the NR Composite and the NR-SBR Composite

2012 ◽  
Vol 581-582 ◽  
pp. 552-555
Author(s):  
Cai Jun Liu
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Short Fiber ◽  
Maximum Power ◽  
Mechanical Process ◽  
Contrast Method ◽  
Unit Energy ◽  
Unit Energy Consumption

The influence of the pretreatment polyester short fiber on the mechanical process and the properties of the NR/ SBR compound was studied by using contrast method. The results showed that the maximum power and the unit energy consumption increased because of short fiber, and the temperature also enhanced. So the low rotate speed is better. When the composite were cured, it had much characteristic such as rapid vulcanization speed, short scorch time and vulcanization smooth period. But the mechanical properties were increased. In the end, the microscopic photo of composite with the scanning electronic micrograph was taken.

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