The various factors affecting the choice of concrete mix design are: 1. Compressive strength of concrete. ... mixing, placing, curing and testing. Finally, the lower the difference between the mean and minimum strengths of the mix lower will be the cement-content required. The factor controlling this difference is termed as quality control.
The objective of this investigation was to study the effects of a number of factors on the setting time and mechanical behavior of polymer concrete. Factors inc
Concrete in hot weather is subject to high loss of moisture by evaporation and rapid hardening, which affect the placement operations and the cracking potential. High ambient temperature, high concrete temperature, low relative humidity, and high wind speed are conditions that tend to damage the freshly mixed or hardened concrete. …
Factors affecting kinetics of CO2 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, …
The curing degree of the concrete blocks after 2 h of CO 2 curing is shown in Fig. 12. Regardless of which types of aggregate were used, the curing degree of the fly ash-lime based specimen was higher than that of the cement based specimen. This may be due to lime having a larger specific surface area (4850 cm 2 /g) than cement (3519 cm 2 …
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 ...
ACI 308 – Guide to Curing Concrete suggests three phases of concrete curing. These phases are shown in figure 1.6 of ACI 308. The right time of curing of concrete depends on: 1. Initial Curing . When the concrete is placed and compacted, bleeding of water occurs and rises through the surface of concrete due to the settlement of concrete.
Jiang et al. studied the main factors affecting the mechanical properties of early alkali slag concrete. It was found that the compressive strength increased with the …
The most common types of concrete shrinkage cracks include:. Plastic shrinkage cracks: Plastic shrinkage is a type of concrete shrinkage that occurs when excess water evaporates from the concrete surface. This results in rapid drying that causes the surface to shrink before the rest of the concrete has had a chance to set. It is a common issue, …
Title: A Summary of Factors Affecting Concrete Salt-Scaling Performance Author(s): Kamran Amini, Kristen Cetin, Halil Ceylan, and Peter C. Taylor Publication: Materials Journal Volume: 117 Issue: 3 Appears on pages(s): 53-62 Keywords: curing regimes; hardened properties; mixture components; multiple regression analysis; salt …
Drying shrinkage is the contraction in the concrete caused by moisture loss from drying concrete. Shrinkage-compensating concrete is used to minimize cracking and structural movement caused by drying shrinkage in concrete. The amount of drying shrinkage that occurs in concrete structures depends on the constituent materials, …
Some other factors causing segregation in concrete:-Transporting concrete mixes for long distances. Poorly proportioned mix, where sufficient matrix is not there to bind the aggregates. Dropping concrete from more than 1m. Vibrating concrete for a long time. ... Curing of Concrete
The present article reviews studies that used microwave curing, autoclave curing, carbon curing, steam curing, electric curing, ambient and air curing and water to …
Effect of water/cement ratio on the development of the compressive strength for ed concrete with Tek ing agent and target dry density 600 kg/m 3 for different curing conditions
This paper deals with the effects of several factors, such as CO 2 pressure, curing time, water-to-cement ratio and continued curing after CO 2 curing on …
Factors affecting the workability of concrete are materials such as water content, cement concrete, sand and aggregate properties such as size, shape, grading, mix design ratio and use of admixtures. ... Curing Methods for Different Types of Concrete Construction. Next article. RELATIVE DENSITY OF WATER W.R.T. TEMPERATURE. Gopal Mishra.
The creep of concrete is a crucial characteristic to be taken into account in structural design, which can significantly impact the long-term durability and performance of concrete structures. Creep refers to the gradual deformation and flow of concrete over time under sustained loading. In this section, we will explore the concept of creep in concrete, the …
Setting time of cement is same as setting time of concrete. Stages of setting of cement, setting times of cement and factors affecting and initial and final setting time of different cements and various processes …
Effects of Microwave Curing on the Mechanical Properties of Ultra-high Performance Concrete and Affecting Mechanism: GAO Xiaojian 1,2, LI Shuangxin 1,2: 1 School of Civil Engineering, Harbin Institute of Technology, Harbin 150001 2 The Key Laboratory of Structural Engineering Catastrophe and Control of the Ministry of Education, Harbin …
This paper deals with the effects of several factors, such as CO 2 pressure, curing time, water-to-cement ratio and continued curing after CO 2 curing on temperature profiles, CO 2 curing degree and strength of concrete. Results indicated that the accelerated reactions between CO 2 and cement minerals happen mainly during the first …
The concrete surfaces are kept wet for a certain period after placing of concrete so as to promote the hardening of cement. It consists of a control of temperature and of the moisture movement from and into the concrete. The term curing of concrete is used to indicate all such procedures and processes. Purposes of Curing: Following are the objects or …
Factors affecting the durability of concrete. The strength of the concrete depends on many factors, as described below. ... Water Penetration Test – Using hydrostatic pressure after completion of 28 days curing period, the concrete will be tested for its water permeability. The specimen will be cut in half vertically after three days & measured.
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 ...
What factors can affect concrete curing time? Factors affecting concrete curing time include its composition, ambient conditions, water-cement ratio, and the curing method used. These elements are crucial in determining the curing duration. Related Blogs to Concrete Cure Time. Concrete Curing Temperature Chart: Optimizing Strength
Concrete sets and hardens as a result of a chemical reaction between cementitious materials and water. This process is called hydration. Curing is the process of maintaining satisfactory temperature and moisture conditions in concrete long enough for hydration to develop the desired concrete properties. The potential strength and …
5. Age of Concrete. The hydration of cement increases with the increasing the age of concrete. In controlled curing, of concrete the maximum strength of concrete will achieve at 28 days and will increase in decreasing rate till two years and final strength will achieve only after one to two years of placement.
The main conclusion is that steam curing can improve the early strength of concrete, but thermal damage, shrinkage cracking, delayed ettringite formation …
Downloadable (with restrictions)! This paper deals with the effects of several factors, such as CO2 pressure, curing time, water-to-cement ratio and continued curing after CO2 curing on temperature profiles, CO2 curing degree and strength of concrete. Results indicated that the accelerated reactions between CO2 and cement minerals happen …
When new concrete is placed next to old concrete, attempts are usually made to bond the two concretes together: often a cement paste or mortar "joint" is used, ... Factors Affecting Bond Between New and Old Concrete. Author(s): ... Volume: 85. Issue: 2. Appears on pages(s): 117-125. Keywords: bond (concrete to concrete); bonding; cement pastes ...
Factors Affecting Curing Time. There are a variety of factors that may affect a concrete slab or structure's curing time. The most notable of these – moisture – plays a role at every step of the concrete application process. If, for example, a concrete mixture has more water added than an average mixture, it will likely take longer to cure.
The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, …
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 …
This paper mainly gives an overview of factors affecting the effectiveness of internal curing in cement-based materials from three aspects: the amount of internal …