At present, the vast majority of special-shaped steel pipe construction materials in China have developed product technical standards, which include product specifications, classification, technical requirements, inspection methods, acceptance rules, marking, transportation and storage. The technical standard of building materials is the technical basis of product quality. For production enterprises, it is necessary to produce qualified products according to the standard, and it can promote enterprises to improve management, improve production efficiency, and realize the rationalization of the production process. For the use of the department, the material should be selected according to the standard, which can standardize the design and construction, thus speeding up the construction progress and reducing the construction cost. At the same time, the technical standard is the basis for the acceptance of product quality by both the supply and demand sides, and is a prerequisite for ensuring the quality of special-shaped steel pipe engineering. At present, China's technical standards are divided into four levels: national standards, ministerial standards, local standards and enterprise standards. The national standard is a national guidance technical document issued by the National Bureau of Standards, code named GB; The ministerial standard is issued by the Department in charge of production (or General Administration), and its code is determined by the name of the department, such as the building materials standard code is JC, and the construction engineering standard code is JG; The local standard is the local guidance technical document issued by the local competent department, and its code is DB; The enterprise standard is only applicable to the enterprise, its code is QB, where there is no national standards, ministerial standards for products, should develop enterprise standards. The expression method of the standard consists of the standard name, department code, number and promulgation and implementation year, such as: "Ordinary concrete mix design Regulations" (JGJ55-2011), the department code is JG,J represents the construction industry, the construction standard number is 55, the promulgation and implementation year is 2000; For example, "Construction sand" (GB/ T14684-2011) means that the national recommended standard number is 14684, which is the construction sand standard promulgated and implemented in 2011. Since the technical standard is formulated according to the technical level of a period, it can only reflect the technical level of the period, and has temporary relative stability. Technical standards should be continuously revised according to the speed and requirements of technological development, and China will revise them once in about five years. In order to meet the needs of market economy, various technical standards in our country are moving closer to the standard. Special-shaped steel pipes are closely related to construction materials or foreign standards mainly include: standard, code-named ISO; American Society for Testing Materials standard, code: ASTM; Japanese industrial standard, code JIS; German industry standard, code DIN; British standard, code named BS; French standard, code NF, etc.

There are many varieties of building materials, for the convenience of teaching, this textbook will be discussed according to the following commonly used building materials: gypsum, lime, water glass, cement, concrete, mortar, building steel, wall materials, waterproof materials, thermal insulation materials, sound absorbing materials and decorative materials, etc. Various materials need to be studied in a wide range of content, involving raw materials, production, composition, structure, construction, etc. Nature, application, inspection, transportation, acceptance, storage and use management and other aspects, in the learning method, we must first pay attention to learn the main content - the technical nature and reasonable application of materials. Everything else should be learned around this center. In general, civil engineering technology and management personnel are the users and managers of materials, learning the raw materials, production, composition and structure of materials, the purpose of which is to have the necessary understanding of the formation factors of material properties, so when learning these aspects of content, they should be for the purpose of mastering material properties and application technology. The basic principles of inspection, transportation, acceptance and storage of materials related to special shaped steel pipes should also be deduced from the technical nature and scope of application of materials, and they can not be turned into some isolated and rigid concepts. For different varieties of materials of the same genus, it is not only necessary to learn their commonalities, but also, more importantly, to understand their respective characteristics and the reasons for these characteristics. For example, when learning a variety of cement, it is not only necessary to know that they can harden in water and other common properties, but also to pay attention to their respective qualitative differences and thus reflected in the difference in performance. Experiment course is an important teaching link of this course. Its task is to verify basic theories, learn experimental methods, and cultivate scientific research ability and rigorous scientific attitude. When doing experiments, be serious and meticulous. Even for some simple experiments, there should be no exception. It is necessary to understand the influence of experimental conditions on experimental results, so that the experimental results can be correctly analyzed and judged.