Factors affecting evaporation of water from concrete: The evaporation of water depends upon the following 4 factors: Air temperature, Fresh. concrete temperature, Relative humidity and Wind velocity. From the above mentioned factors it can be concluded environment directly influences the
These two types of curing reduce the drying shrinkage by half as much as they reduce creep. Other factors affecting creep include type of cement, amount of cement paste, size and shape of concrete, amount of reinforcement (rebar), volume-to-surface ratio, temperature, and humidity.
Aug 10, 2018· Title: Studies on Some Factors Affecting CO2 Mixing or CO2 Curing of Cement Concrete Author(s): Ming-Gin Lee, Yung-Chih Wang, Yu-Min Su, and Yishuo Huang Publication: Symposium Paper Volume: 326 Issue: Appears on pages(s): 120.1-120.8 Keywords: carbon dioxide, strength, concrete, CO2 mixing, CO2 curing Date: 8/10/2018 Abstract: It is a well-known fact that …
Sep 13, 2017· The factors affecting the strength of concrete are mentioned below. These factors can be either dependent or independent of each other when comes to the concrete strength. Most of the factors are interrelated in certain means. The primary factor that has a higher influence on the strength of the concrete is the mix design factors. Each of them is mentioned and explained in detail one by one.
Mar 18, 2017· Water content has been found to affect the magnitude and rate of drying shrinkage in concrete. Other factors include elastic properties of the aggregate used in the concrete mix; in general, aggregate with a high elastic modulus will produce low shrinkage concrete. Aggregates which contain clay minerals will affect shrinkage behavior as well.
In this study, a model was proposed to describe the CO2 curing of concrete. Then, it examined the effects of several factors, including preconditioning parameters, compaction pressure, CO2 concentration and pressure on CO2 curing kinetics of concrete compacts. Results indicated that a dry preconditioning before CO2 curing was critical for compacted concrete samples to achieve high CO2 curing ...
Effect of Admixtures 9. Effect of Curing and Storage Conditions 10. Effect of Relative Humidity of the Medium 11. Effect of Volume/Surface Ratio and a Few Others. Factor # 1. Aggregate Content: The most-important influence on the shrinkage of concrete is exerted by the aggregate, which restraints the amount of shrinkage of the cement paste.
In this study, a model was proposed to describe the CO 2 curing of concrete. Then, it examined the effects of several factors, including preconditioning parameters, compaction pressure, CO 2 concentration and pressure on CO 2 curing kinetics of concrete compacts. Results indicated that a dry preconditioning before CO 2 curing was critical for compacted concrete samples to achieve high CO …
Factor affecting Curing Time of Concrete. To avoid premature drying out especially from wind and solar radiation. To avoid leaching out rain and flowing water. To avoid rapid cooling after the first few days of placing. To reduce high internal thermal gradients.
part one: factors affecting proper concrete curing practices originally published in the summer 2014 american edge by terry swor, pg, and gerard moulzolf, pg – aet saint paul special series: consider the cure a newsletter for clients and business partners of american engineering testing, inc.
Factors Affecting Shrinkage in Concrete: The extent of initial shrinkage in concrete and cement mortar depends on numbers of factors namely: 01. Cement Content: As a general rule, the increase in the richness of concrete mix which leads to drying shrinkage. Also Read: All You Need to Know About Cement. 02. Water Content:
Curing is the maintenance of a satisfactory moisture con-tent and temperature in concrete for a period of time imme-diately following placing and finishing so that the desired properties may develop (Fig. 12-1). The need for adequate curing of concrete cannot be overemphasized. Curing has a strong influence on the properties of hardened concrete;
The primary factors affecting concrete compressive strength is the amount of cement.The higher the cement content, the greater the tendency for shrinkage cracks to form while the concrete is curing and hardening.Types of cement also has a great impact on the properties of hardened concrete.
Oct 01, 2001· (1) The content of UFA, pulverized slag, and water content are the main factors affecting the compressive strength of steam-curing concrete. The preheating time and silica fume have influence on early compressive of steam-curing concrete, but have concealed influence on …
Jul 29, 2019· Curing is a procedure that is adopted to promote the hardening of concrete under conditions of humidity and temperature which are conducive to the progressive and proper setting of the constituent cement. Curing requires adequate Moisture, Temperature and Time. If any of these factors …
May 07, 2021· 3 Techniques for Efficient Concrete Curing. Many factors affect the rate at which water evaporates from freshly placed concrete. This includes air temperature, humidity, concrete temperature, and wind speed. As a result, many techniques have been developed to help concrete retain moisture at the early ages. These methods are used to:
Nov 28, 2016· A study has been conducted to investigate the mechanical properties of cement-mixed gravel using the unconfined compression test and the tensile test. Basic factors including the curing period, the water-binder ratio, the cement content, and the strain rate were evaluated. Ordinary Portland cement with fly ash was employed as the cementation agent for preparing cemented samples.
Feb 02, 2017· Concrete that has been specified, batched, mixed, placed, and finished can still be a failure if improperly or inadequately cured. Curing is usually the last step in a concrete project and, unfortunately, is often neglected even by professionals. Factors Affecting Curing of Concrete. The best curing …
Jun 28, 2020· Curing of concrete: Curing plays a vital role in concrete strength development and durability. After adding water to the concrete mix (Cement, Sand & Aggregate), the exothermic reaction (hydration) takes place, which helps the concrete to harden.Hardening of concrete is not instant and continues for a longer period, which requires more amount of water for processing hydration.
Feb 09, 2021· In this investigation, the E values of 108 concrete specimens which differed in aggregate type, cementitious material (binder) type, strength and curing age were measured. Seven factors were assessed for their degree of influence on concrete's elasticity, namely, aggregate type, aggregate percentage content, cementitious binder type, curing age ...
Variation in standard curing of test specimens can dramatically affect measured concrete properties. According to the National Ready Mix Concrete Association 8 (NRMCA), strength for concrete air cured for one day followed by 27 days moist cured will be approximately 8 percent lower than for concrete moist cured for the entire period.
Feb 02, 2017· Concrete that has been specified, batched, mixed, placed, and finished can still be a failure if improperly or inadequately cured. Curing is usually the last step in a concrete project and, unfortunately, is often neglected even by professionals. Factors Affecting Curing of Concrete. The best curing method depends on: Cost; Application ...
Sep 16, 2013· Various factors that affect the strength properties of hardened concrete are as follows. Curing conditions, humidity. Temperature. w/c, (inversely related) Abram's law. Air content, (inversely related), short and long term. Aggregate characteristics, roughness,grading, mineralogical.
Request PDF | Factors affecting kinetics of CO 2 curing of concrete | In this study, a model was proposed to describe the CO2 curing of concrete. Then, it examined the effects of several factors ...
Factors included the initiator-to-promoter ratio, initiator and promotor levels, casting temperature, testing temperature, aggregate type and gradation, and the effect of cold joints. Results of tests on 78 beams and 63 cylinders are reported. The results indicate that 1) polymer concrete properties remain stable with large variations in the ...
Jul 20, 2015· Factors affecting the rate of carbonation. ... low cement content, or where a short curing period or inappropriate curing methods are used. Concrete containing large quantities of supplementary cementitious materials, namely fly ash or slag, may also experience an increased rate of carbonation when compared to concrete with the same w/cm made ...
Aug 03, 2021· The humidity of the air affects the seepage of moisture from the concrete. An increase in the humidity reduces the rate of loss of moisture and this reduces the seepage. Thus for a given concrete creep is higher. The lower the relative humidity. Drying of the concrete while under load enhances creep of concrete.
The article published in this website Factors affecting Curing Time of Concrete provides detailed information on the curing period of concrete. The following figure extracted from the web site clearly indicates the effect of the curing period on strength development.