Summary of Clase Virtual 4 - Propiedades del Concreto en Estado Endurecido

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00:00:00 - 01:00:00

This video discusses the properties of concrete in an aged state. It covers topics such as stress, strain, and elasticity, and demonstrates how these properties can be measured. The presenter also discusses the importance of dimensional stability in the design of structures, and how it can be affected by factors such as external loads and environmental conditions.

00:00:00 This video covers the properties of concrete in an endurance state.
00:05:00 This week's video presentation focuses on the properties of concrete in an aged state. Every Monday, we will be conducting a session on this subject, and the last session ends on May 26th. There are seven topics covered in the entire course, and for those who are interested, I will be sending out an email reminder the week of Monday, May 2nd, for the session on Tuesday, May 3rd. In this particular presentation, our panelist is Engineer José Alfredo Rodriguez, and he will be giving us some details about his professional career. First, he will talk about his experience in the concrete industry for the past 20 years, and then he will go on to talk about his work at the university labor union. Currently, he is the head of innovation for Jos, and he has been working in Mexico for the past five years. I would like to invite everyone to participate in this webinar, no matter where they are located. José is here in this webinar, and I am glad to finally meet some of you who are watching from behind the computer screen. I am an engineer with a civil engineering degree from the Autonomous University of Mexico, and I have been working in the technology field for about 25 years. I have
00:10:00 This video discusses the properties of concrete in an endurecened state. There is a thin line between concrete in an endurecened state and concrete in a fresh state, and the properties of concrete in an endurecened state depend on how it is studied - grown in three dimensions. The properties that relate to the mechanical properties and durabilty are dependant on where the information is found. We will start with the basic topic, that is, concrete in this state is known as "ruiz ido." There is no real definition of this state, and it is actually called "endurecido" because it has resisted aging. In reality, it is very ambiguous, and all the literature on this topic can be found. However, there is a key proof in this topic, which was seen in the past during a webinar on concrete. Our fresh state, which relates to the measurement of time, is what really has to do with the concrete's stability in dimensional and volumetric terms. We can say that the norma stma 403 defines the methodology for measuring the time that has been recorded. I tried to make a faithful copy of what the norma s tm 403 states regarding energy when it appears. When the time of work initial
00:15:00 This video discusses the properties of concrete that change over time, specifically its dimensional stability. It covers topics such as stress, strain, and elasticity, and demonstrates how these properties can be measured. The presenter also discusses the importance of dimensional stability in the design of structures, and how it can be affected by factors such as external loads and environmental conditions.
00:20:00 In this video, six properties of concrete are discussed, including its elasticity, which is defined as the relationship between the load applied to the concrete and the degree of its deformation. The standard procedure for calculating the elasticity was introduced, and three models of concrete were outlined-the classical model, the shear model, and the plate model. The classical model is the most commonly used, and it assumes that the concrete has a resistance to compression of 350-400 kPa. If the load applied is greater than this resistance, the concrete will deform. A newer model, the 318 model, takes into account the effect of weight and type of aggregate used in the concrete. The shear model is a modification of the classical model that takes into account shear stress. The plate model is a modification of the shear model that takes into account the effect of weight on the plates that make up the concrete. The elasticity of concrete can be determined using one of five methods, all of which take into account the resistance to compression of the concrete. The most common method is the classical model, which is based on the assumption of a resistance to compression of 350-400 kPa. The other four methods are based on different models of resistance to compression, and all
00:25:00 This video covers the properties of concrete in an aged state. It discusses the effects of various factors on the concrete's modulus of elasticity. It also discusses the use of two models for structurally sound buildings - the European design code of 1990 and the Mexican standard. The video also covers the effects of four major factors on the concrete's modulus of elasticity: the concrete's initial stiffness, humidity, the type of aggregate, and the type of cement. The video concludes with a discussion of how the modulus of elasticity affects the microstructure of concrete.
00:30:00 This video discusses the properties of concrete in an established state, focusing on how the two influences one another and how the concrete's behavior depends on its design and composition. Other factors that influence concrete's behavior include the type of mixture used, environmental factors, and the use of additives. One important property of concrete is that it undergoes continuous contraction and deformation. This is related directly to moisture loss over time, and can be controlled by proper design. However, some people might hear the term "compensated construction" and think that the concrete is unbreakable. In reality, all concrete is subject to contraction and deformation, and can be controlled or prevented by proper design. For example, if we understand the cyclic behavior of concrete, we can design it to be more resilient to small deformation. Another important property of concrete is its acoustic behavior. This is related to the sound it makes and how it responds to vibrations. Concrete typically expands very slowly and has very small vibrations, which means that it can easily rebound from small contraction. If we don't take vibration into account, we may end up with a structure that is unstable. In order to prevent this, we need to water the concrete frequently. Cementants
00:35:00 This video discusses the properties of concrete in an aged state. It covers reversible compressive and tensile stress, and how to measure it. The most relevant aspect is knowing how to use concrete, which is discussed in detail. Some factors that influence concrete's aging are discussed, including water content, type of aggregate, and construction method. Finally, two points are made: first, concrete can range from a construction site with zero construction to a building with 800 or 1,200 meters of length; and second, for industrial floors, the design must take into account the drying phase and the importance of proper aggregate selection.
00:40:00 This video discusses the properties of concrete in an "endured" state. The third property is that the contraction occurs only in the added material if it does not also occur in the paste. The fourth property is that the contraction is highest when the mixture is initially mixed and then gradually reduced in size. The fifth property is that the concrete will suffer contraction due to the mixture's resistance to compression, and the sixth property is that the resistance to compression is the most important property to consider when designing a concrete structure.
00:45:00 This video discusses the properties of concrete in an aged state and the various methods used to test for these properties. It covers direct and indirect methods, and explains that the results obtained using these methods are quite different from the real world. Two normative standards are mentioned - the ACE TMD 496 and the SIS 78. The former is based on the idea that the resistance to compression of metal is between 2 and 5 percent, while the latter values 18 to 15 percent. The video also covers the topic of attention absorption, showing examples of tests and explaining the theoretical results.
00:50:00 In this video, three properties of concrete are discussed: its compressive strength, its resistance to abrasion, and its ability to resist heat. Each property is discussed in depth, and examples are given of how these properties can be used in design. Finally, a third property, resistance to base movement, is discussed.
00:55:00 This video discusses the properties of concrete in an "aged" state. Natural powders like clay depend on the level of reactivity of the cementing materials, and a predictive model can be used to determine the use of additives that only reduce water levels of medium to high technology new water saving additives, if additives are reducers of water, if they are adhesive, or delay the process of curing. All of these combinations give a certain parameter which directly affects the quality of the final product. The other topic discussed is the quality of the add-ons. The type of add-on, if natural, with crushed rock, and dependent on the way it is distributed, will depend greatly on the shape of the final product, and will be influenced by the quality of the regulations that may come into effect. The maximum size that can be achieved will also be affected by these parameters. Other important parameters that are not always considered are the mechanical resistance and adhesion between the cement paste and the add-on. This photograph is a good example of how these two factors can be seen together. In the lower part of the photo, you can see the group of add-ons, but I like to use it because when you see it, you can clearly see the mark left

01:00:00 - 01:20:00

This video covers the properties of concrete that are resistant to degradation. It is noted that, if the concrete is treated for seven days, it can slowly grow. Additionally, if the concrete is treated within the time frame, the degraded state of the material affects it directly. Finally, there is a direct relationship between compressive strength and resistance to fire, with a fraction of 3 to 5 percent change in compression strength due to moisture content changes. However, the real world is going to depend on the concrete's resistance to fire, water, and corrosion. Finally, the properties of the concept of durability are discussed, and it is noted that it is related to the majority of these resistance characteristics.

01:00:00 In this video, the properties of concrete that are resistant to degradation are discussed. It is noted that, if the concrete is treated for seven days, it can slowly grow. Additionally, if the concrete is treated within the time frame, the degraded state of the material affects it directly. Finally, there is a direct relationship between compressive strength and resistance to fire, with a fraction of 3 to 5 percent change in compression strength due to moisture content changes. However, the real world is going to depend on the concrete's resistance to fire, water, and corrosion. Finally, the properties of the concept of durability are discussed, and it is noted that it is related to the majority of these resistance characteristics.
01:05:00 This video covers the properties of concrete in hardened state. It shows how the size of these poles approximate to each other, and that if they were to be the same size, this one would be slightly smaller. The pole shown in the video is from my online course on this subject. Concrete that has many pores (not necessarily permeable) does not necessarily mean it is not permeable, because pores need to be connected for it to be permeable. There is a difference between porosity and permeability, which is shown in this example of a concrete with high permeability. Porosity is related to water and cement content, while permeability is related to the maximum amount of water and cement that can be injected before the concrete becomes saturated. These two graphs correlate water, cement, and maximum aggregate size. The relationship between water, cement, and aggregate size is clear. It has a significant impact on the personality of the concrete. For example, because the amount of water injected will determine the amount of cement that will be converted to paste, the level of permeability will be directly related to the aggregate size. However, we will go into a hypothetical case at the same level of quality of aggregate. This video covers the properties of concrete in hardened state
01:10:00 This video introduces the properties of concrete that are resistant to wear and tear. It shows how the maximum size of aggregate is related to the number of micro-cracks that can exist on the surface. It also features a quote from famous author, Albert Einstein, and discusses how imagination is key to creativity. Three people give responses to the question of how concrete is resistant to wear and tear.
01:15:00 In this video, Torres Eduardo Cabrera and Verón Juan Carlos Yáñez discuss the properties of concrete in an aged state. Juan Carlos Yáñez, who is also from the country, shares his opinion on the attraction of concrete. Torres Eduardo Cabrera then asks Guillermo Flores about the elasticity of larger buildings, and whether it should be determined at the time the building is constructed or at a later age. Diego Andrés asks about the practice of removing hearts of concrete after it has been in a structure for more than 50 years. Torres Eduardo Cabrera responds that, in this case, reblandering may occur even after so long a time. Two conditions must be met for this to happen: the concrete must be exposed to humidity, and the building must be in a state of dryness. Finally, Guillermo Flores asks about the practice of measuring the elasticity of concrete at the time it is extracted. Torres Eduardo Cabrera responds that there is a norm for this, and that it can be found in Asia's building codes.
01:20:00 The presenter discusses the properties of concrete in an aged state. It is noted that the resistance of the heart can reduce by up to 35% depending on a variety of factors. The ideal situation is to allow the concrete to rest in some way so that they can relax after a sudden exertion. This also happens with concrete in an aged state, but if it is wet it is the conditions for curing that the presenter recommends. The presenter then discusses how to measure the degree of cure and how to provide recommendations to each individual country depending on their situation. The next session is scheduled for Tuesday, May 26th. If you have not registered yet, you can do so at the website.