Civil Engineering Materials Essay Sample

In summary, the application of intelligent materials in civil engineering makes up for the shortcomings of the traditional building structure weak ability to adapt to the environment, and shifts the need for man-made detection of the building structure to the building structure with self-testing, adjusting and adapting functions. The following is the civil engineering materials paper I have organized for your reference.

Civil Engineering Materials Essay Sample 1: Teaching Civil Engineering Materials Course

Abstract:

By studying ? Civil Engineering Materials? course, it should make students not only learn the knowledge, but also exercise the ability, broaden the horizons; not only mastered the knowledge of this course, but also for the study of other specialized courses to lay a good foundation. Therefore, to do a good job? Civil engineering materials? The teaching of civil engineering materials is of great significance.

Keywords: civil engineering; materials

First, classroom teaching

(a) focus

? Civil engineering materials? More course content, it is impossible to explain all in a limited number of hours, should be based on the nature of the profession, divided into primary and secondary, highlighting the key points. Cheng Yunhong and other editors of the "civil engineering materials" [1], for example, the classroom focus on the following: Introduction, Chapter 1 (basic properties of civil engineering materials), Chapter 2 (inorganic cementitious materials), Chapter 3 (cement concrete), Chapter 4 (mortar), Chapter 6 (civil engineering steel), Chapter 7 (asphalt and asphalt mixtures). Through the introductory study, students have a terse understanding of civil engineering materials and an understanding of ? Civil Engineering Materials? This course has a general understanding; the first chapter allows students to understand the basic properties of civil engineering materials, including physical properties, mechanical properties and durability, etc., and at the same time to understand the basic theory of materials science, that is, the composition of the material, the structure and structure and its relationship with the properties of the material; the second, third, fourth, sixth and seventh chapters were explained in the engineering of the most commonly used several civil engineering materials and applications of the properties. and application. Chapter 5 (masonry materials), Chapter 8 (wood), Chapter 9 (synthetic polymer materials) and Chapter 10 (building functional materials) as the content of students' independent study, but the teacher should guide and encourage students to think positively in the process of independent study and the courage to ask questions. Classroom teaching, the focus of the content of the explanation of the deep talk, so that students solid mastery, so that learning; to avoid all-encompassing, do not seek to understand. Moreover, with the content of the key explanation as a foundation, students will not feel difficult to learn other chapters independently. The focus of the classroom explanation and the students' independent learning organic combination, not only is conducive to the students to master the systematic theoretical knowledge, but also gives students the space for independent learning, is conducive to the development of the students' spirit of questioning and the ability to solve practical problems, the development of the students' imagination and sense of exploration.

(ii) scientific explanation

? Civil Engineering Materials? The content of the course is relatively loose, easy to produce a sense of explanation, and even tasteless; if you can carefully arranged, scientific explanation, the effect will be very different. For example, the general silicate cement, including silicate cement, ordinary silicate cement, slag silicate cement, volcanic ash silicate cement, fly ash silicate cement and composite silicate cement, if according to the textbook of a cement followed by a kind of cement to talk about, the students will learn to feel repetitive, stacked, messy, and even do not know what to say. Therefore, for this part of the content to be scientifically integrated, focusing on the mineral composition of silicate cement, hydration and solidification hardening process, technical properties and so on to explain thoroughly; and in the introduction of mixed materials of silicate cement, to seize the potential activity of the active mixed materials and mixed with active mixed materials of cement of the second hydration reaction, and then give a variety of cement with the method of comparison of the **** and personality, so that the content of a compact, clear vein, the students will feel repetitive, stacked, messy, and even do not know the clouds. This way, the content is compact, the vein is clear, and it is easy for students to grasp. Understanding the similarities and differences of the technical properties, it will be easy to further grasp the engineering applications of various cements. Another example, in modern cement concrete technology, admixtures have become an important component of cement concrete, therefore, for the sake of systematic and complete content, general teaching materials (such as literature) will be? admixtures? in? Constituent materials of ordinary concrete? In the introduction. However, admixtures are used to improve the performance of concrete, if you do not understand the performance of concrete, it is difficult to understand the role of admixtures, therefore, in the lecture, it should be adjusted appropriately, put? Admixtures? Put? The main properties of concrete mix? and? The main properties of hardened concrete? This will be more convenient for students to understand and memorize the related course content. In short, the scientific organization and explanation of course content, for a good job? Civil engineering materials? Classroom teaching plays a multiplier effect.

(C) theory and practice

First, from the most familiar life reality. Civil engineering materials are closely related to real life, in fact, everyone in real life have accumulated a lot of relevant experience, just because they do not have specialized knowledge, and do not know the reason. For example, a certain cement mortar floor is broken, and after repairing it with cement mortar, it needs to be watered and covered for a period of time. I'm sure many people have seen this practice, but not everyone may know why this is. When explaining the hydration, coagulation and hardening process of cement, mentioning this phenomenon, students will realize that this is maintenance, and in time for students to understand that maintenance requires a certain temperature, humidity and time. In this way, the students from the life of direct experience combined with theoretical knowledge in books, eliminating students' unfamiliarity with the course, stimulating students' interest in learning. Secondly, a large number of engineering examples are listed. Typical engineering examples is the most effective way to understand and digest theoretical knowledge, focusing on the background of the engineering application of materials, to avoid isolation from the project to explain the material. For example, when it comes to concrete durability problems, one of the examples: Beijing Sanyuan overpass piers, less than two years after the completion of the individual places occur? Herringbone? Cracks, analyzed that the main reason is the occurrence of alkali - aggregate reaction; Example No. 2: Chernobyl nuclear power plant in Ukraine, due to the leakage of reinforced concrete structures, resulting in large areas of radioactive contamination, the ecological environment has been seriously damaged. In addition, it can be illustrated with figures, ? In industrially developed countries, more than 40% of the total investment in the construction industry is spent on the repair and maintenance of existing structures, and less than 60% on new facilities? Through a large number of examples, students can realize the importance of concrete durability and understand that the premature destruction of many concrete structures is not due to insufficient strength, but due to insufficient durability. Finally, laboratory instruction is emphasized. The laboratory class is ? Civil Engineering Materials? course is a very important teaching link, experimental teaching is a good supplement to classroom teaching. In the experimental class, students learn from the books to the material has a visual understanding of the performance of the material to further understand, in their own hands in the process of experimentation, improve the ability to apply the material. At the same time, through the experiments to verify the basic theory, learning experimental methods, cultivate the ability of scientific research and rigorous scientific attitude.

(D) pay attention to the new progress of the discipline

The textbook is the basis of teaching and fundamental, but the update of the textbook needs time, and the development of civil engineering materials is very rapid, so in the teaching process, should pay close attention to the latest progress of civil engineering materials research and engineering applications, and timely supplement to the teaching. At the same time, with the continuous introduction of new materials and new technologies, the quality standards of materials and related design and construction specifications will also be updated, and this part of the content should also be added to the teaching in a timely manner. In this way, it is conducive to students' understanding of the development of the discipline, broaden their professional horizons, cultivate a sense of innovation, stimulate the spirit of exploration, and improve students' engineering quality and engineering awareness

Second, post-course assignments

Post-course assignments play a very good consolidation and supplementation of classroom teaching. Through homework, students can better digest and understand what they have learned in the classroom, and can apply what they have learned. In this course, part of the homework comes from the review questions at the end of each chapter of the textbook, which need to be selected by the teacher according to the key points and difficulties of the classroom teaching, for example, concrete aggregate grading, general concrete proportion design. Teachers should correct the homework carefully and summarize it, so that students do not do homework for the sake of doing homework, but to achieve true mastery. Another part of the after-school homework is comprehensive and discussion. For example, Cheng Yunhong and other editors of "Civil Engineering Materials" in the ? Open Discussion? part, which is forward-looking, can guide and inspire students to do some exploratory work. That is to say, students are allowed to choose what they are interested in from it, and check the literature around this content, think y and discuss freely. Broaden the students' horizons and cultivate their sense of scientific research.

III. Conclusion

By studying ? Civil Engineering Materials? course, students should be made not only learned knowledge, but also exercise the ability to broaden the horizons; not only mastered the knowledge of this course, but also for the study of other specialized courses to lay a good foundation. Therefore, to do a good job? Civil engineering materials? The teaching of civil engineering materials is of great significance.

References

1, international large-scale civil engineering contracting project bidding risk quantitative assessment of Liu Rui Tianjin University 2003-06-0155

2, civil engineering in the anchor support mechanism research status and prospects of Jia Yingjian, Song Hongwei geotechnical engineering community 2003-08-3053

civil engineering materials Sample paper 2: The use of intelligent materials in civil engineering

Abstract:

Keywords:

1 The application of intelligent materials in civil engineering

1.1 Optical fiber in the monitoring of soil mixing materials

Optical fiber material, an optical communication medium, whose greatest advantages are fast transmission speed, low signal attenuation and Parallel processing ability is strong, often used in high-demand communication transmission. Optical fiber and fiber optic sensors are mainly used in civil engineering to monitor the curing of concrete. The biggest disadvantages of concrete structures are weak tensile strength, easy corrosion of internal reinforcement, etc. Cracks in concrete blocks occur during large-scale pouring due to temperature differences between the inside and outside of the concrete structure. In this case, the optical fiber is buried into the concrete structure as a sensing element to detect, diagnose, and forecast the strength, temperature, deformation, cracks, vibration, and other dangerous factors that may cause damage to the concrete structure. Further, if the control element can access the information processing system, and the introduction of shape memory class metal and other intelligent materials, the formation of a complete control system, will be able to realize the adaptive function of the soil mixing material This is exactly the current intelligent material structural system in the civil engineering application of cutting-edge topics.

1.2 Piezoelectric materials

Piezoelectric materials generally refers to the pressure received, the material will appear at both ends of the voltage of the crystal material. The application of piezoelectric materials in civil engineering mainly includes static deformation control of structures, noise control and seismic wind resistance and other fields. The traditional method of using piezoelectric materials is to sense the vibration of the structure through piezoelectric sensing elements, and utilize the output results of the sensors to realize the perception of vibration and early warning. On this basis, take the appropriate control algorithm to control and quantify the input of the piezoelectric body, so as to realize the control of structural vibration, which is the current research frontier of piezoelectric smart materials. With the deepening of research and technological progress, piezoelectric intelligent structures in civil engineering should be more and more extensive.

1.3 Piezomagnetic materials

The application of piezomagnetic materials in civil engineering mainly includes magnetorheological materials and magnetostrictive materials. Based on the principle of magnetorheological materials, when the strength of the magnetic field is higher than the critical strength, magnetorheology is transformed from liquid to solid in a very short time. Between solid and liquid can be based on the magnetorheological fluid characteristics of fast, controllable and reversible nature, control fluid properties when the implementation of the need for low energy, so in the smart structure is usually magnetorheological fluid as the main material of the dynamic device. Based on this, magnetorheological materials can be used in the structure of high-rise buildings to realize semi-active control of earthquakes. Because of the broad prospects for potential applications, magnetostrictive materials have received a great deal of attention in recent years. Magnetostrictive materials have a strong magnetostrictive effect, and such materials can be reversibly converted between electromagnetism and mechanics, a property that allows them to be used in high-power ultrasonic devices, sonar systems, precision positioning control, and many other fields.

1.4 Shape Memory Alloys

Shape Memory Alloys are a kind of smart materials with shape memory effect. After the shape of the shape memory alloy is changed, it can stimulate its shape memory effect under certain conditions, and in this process, the material produces a return stress higher than 700 MPa and a return strain of about 8%, and at the same time, it has a strong energy transmission and storage capacity. Based on this property, shape memory alloys are most useful in civil engineering to be used in various structures to realize self-diagnosis of the structure, to increase the toughness and strength of the material, and to enhance the adaptive control of the material. Shape memory alloys can also be developed into intelligent actuators for controlling structural deformation, cracks and vibration. Shape memory alloys have a high phase-change restoring force, which can be combined with this property to develop a passive energy dissipation control system for shape memory alloys, which can realize phase-change pseudo-elasticity and can be used for passive control of energy dissipation and seismic resistance in civil engineering structures. In the current civil engineering practice, the shape memory alloy passive energy dissipation control system is usually placed in the location where the structure is subjected to large seismic effects, such as between layers or at the bottom, which is used to realize the perception of the energy dissipation system on the interlayer deformation of the structure, and then play a role in consuming the seismic energy.

2 advantages and limitations of intelligent materials

Intelligent materials used in civil engineering have the ability to feedback information, self-diagnosis, self-repair, and self-adaptation, and practice has shown that the application of intelligent materials in actual civil engineering makes the engineering structure with high strength and durability, and at the same time, it can intelligently execute the instructions, and it can be adapted to the changes in the external environment. However, the above-mentioned optical fiber, shape memory alloy, piezoelectricity and piezomagnetism are essentially highly intelligent composite materials, whose biggest limitation is that the cost of use is very high and the cost of construction is too expensive. This shortcoming makes the current application of intelligent materials for intelligent limited to higher grade, higher standard construction projects, intelligent materials in the ordinary residential building application is still far away. In addition, the application of intelligent materials requires corresponding technology and supporting materials and equipment to support the construction of construction technology and process requirements are high. Therefore, but at present, the application of intelligent materials is not possible to achieve a full range of widespread popularity, but intelligent materials may be the future direction of research and development of civil engineering materials.

3 Conclusion

In summary, the application of intelligent materials in civil engineering to make up for the shortcomings of the traditional building structure to adapt to the environment weak ability to the building structure needs to be man-made detection to the building structure with self-testing, adjusting and adapting to the function. At present, the application of intelligent materials is still limited to a small number of high-demand and high-standard construction projects, the scientific community for intelligent materials and related technology and supporting equipment research, is the future of intelligent materials can be widely used in civil engineering structures and the premise and foundation.

References

1, civil engineering professional practical teaching link of the reform of the thinking Hu Xiulan; Zhu Mingqiao; Liu Xijun; Cheng flame; Higher Architectural Education 2006-03-2556