Influence of initial curing temperature on the long-term strength of concrete

2013 ◽  
Vol 65 (6) ◽  
pp. 358-364 ◽  
Author(s):  
Runxiao Zhang ◽  
Nannan Shi ◽  
Dahai Huang
Keyword(s):  
Curing Temperature ◽  
Term Strength

Effect of Hydration of Unreacted Cement in Hardened Mortar with Low W/C on the Long-Term Strength

2009 ◽  
Vol 405-406 ◽  
pp. 350-355 ◽  
Author(s):  
Xiao Xin Feng ◽  
Xiao Hua Sun ◽  
Xiao Yan Wang ◽  
Qing Min Wei
Keyword(s):  
Curing Temperature ◽  
Term Strength ◽  
Hydration Degree

Through accelerating the hydration by heighening the curing temperature, the effect of the hydration of the unreacted cement in the hardened mortar with low W/C on the long-term strength was investigated. The results show that in the hardened mortar with low W/C, there exists a lot of unreacted cement at the age of 28 days, and when these cement particles hydrate again at the long age, it is disadvantageous to the long-term strength of the mortar. Moreover, the lower the W/C, the lower the hydration degree at the earlier age, and the more disadvantageous to the development of strength at the long age.

scholarly journals Effects of Mixing and Curing Temperature on the Strength Development and Pore Structure of Fly Ash Blended Mass Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Ki-Bong Park ◽  
Takafumi Noguchi
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Pore Structure ◽  
Weather Conditions ◽  
Strength Loss ◽  
Curing Temperature ◽  
Strength Development ◽  
Mass Concrete ◽  
Term Strength

The aim of this work is to know clearly the effects of temperature in response to curing condition, hydration heat, and outside weather conditions on the strength development of high-performance concrete. The concrete walls were designed using three different sizes and three different types of concrete. The experiments were conducted under typical summer and winter weather conditions. Temperature histories at different locations in the walls were recorded and the strength developments of concrete at those locations were measured. The main factors investigated that influence the strength developments of the obtained samples were the bound water contents, the hydration products, and the pore structure. Testing results indicated that the elevated summer temperatures did not affect the early-age strength gain of concrete made using ordinary Portland cement. Strength development was significantly increased at early ages in concrete made using belite-rich Portland cement or with the addition of fly ash. The elevated temperatures resulted in a long-term strength loss in both belite-rich and fly ash containing concrete. The long-term strength loss was caused by a reduction in the degree of hydration and an increase in the total porosity and amount of smaller pores in the material.

Long-term strength prediction of concrete with curing temperature

2005 ◽  
Vol 35 (10) ◽  
pp. 1961-1969 ◽  
Author(s):  
Seong-Tae Yi ◽  
Young-Ho Moon ◽  
Jin-Keun Kim
Keyword(s):  
Curing Temperature ◽  
Strength Prediction ◽  
Term Strength

scholarly journals Effect of Various Types of Superplasticisers on Consistency, Viscosity, Structure and Long-Term Strength of Geopolymer Products

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7614
Author(s):  
Łukasz Anaszewicz
Keyword(s):  
Fresh Concrete ◽  
Curing Temperature ◽  
Term Strength ◽  
Acrylic Polymer ◽  
Acrylic Polymers ◽  
Air Voids ◽  
Flow Table ◽  
Early Strength ◽  
Air Void

This article presents the results of research on the effect of plasticisers made based on four different compounds—melamine (M), naphthalene (NF), acrylic polymers (AP) and polycarboxylic ethers (PC)—added to the tested mixes in the amount of 2% of the fly ash (FA). The influence of superplasticisers (SPs) on the consistency of the fresh concrete was investigated using a flow table and a penetrometer, and the air voids content was determined by means of a porosimeter. Additionally, the influence of plasticisers on the viscosity of the paste was investigated using a rheometer. Hardened mortar that matured under two different conditions was also tested at elevated and room temperatures. The tested properties were 7-, 28- and 90-days compressive strength and internal microstructure viewed under a microscope. NF had the greatest viscosity-reducing effect while it increased the air void volume in the mix at the same time. The highest early and late strengths were obtained after curing in elevated temperature samples with an acrylic-polymer-based superplasticiser. However, the increased curing temperature of the samples only influenced the early strength results. Its effect was not visible after 90 days. The AP addition also had a significant impact on improving the consistency of the mixture. The addition of plasticisers did not affect the microstructure of the specimens.

Experimental Study of Influences of Initial Temperature on Cement Grout Performance

2015 ◽  
Vol 1095 ◽  
pp. 242-247 ◽  
Author(s):  
Jin Chao Yang ◽  
Wan Peng Wang ◽  
Shu Guang Wang ◽  
Jian Hua Chen ◽  
Wei Yang
Keyword(s):  
Experimental Study ◽  
Initial Temperature ◽  
Setting Time ◽  
Cement Grout ◽  
Curing Temperature ◽  
Term Strength ◽  
Bleeding Rate ◽  
Early Strength

Through the experiment, this paper studies and analyzes influence of different initial temperatures on cement grout performance. The results show initial temperature has influences on grout fluidity, bleeding rate, setting time and early strength. Under guaranteed curing temperature, initial temperature has no influence on long-term strength of grout.

Subcritical Crack Growth and Long-Term Strength in Rock and High-Strength and Ultra Low-Permeability Concrete

2009 ◽  
Vol 58 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Yoshitaka NARA ◽  
Masafumi TAKADA ◽  
Daisuke MORI ◽  
Hitoshi OWADA ◽  
Tetsuro YONEDA ◽  
...  
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
High Strength ◽  
Low Permeability ◽  
Term Strength
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