Cement according to standard

Classification: 1 By appointment cements are divided into: - general - spetsialnye.2 clinker cements divided mind on the basis of: - Portland cement clinker - alumina (high alumina) clinker - sulfoalyuminatnogo (-ferritnogo) clinker. 3 According to material composition cements are divided into types, characterized by different views and content of mineral additives. The type and content of mineral additives in the regulations regulate cement a particular species or a particular group of products. 4When the compressive strength of cements are divided into classes: 22.5; 32.5; 42.5; 52.5. The regulations on cement Certain additional strength classes can be set. For some special types of cements based on their destination classes strength not ustanavlivayut.Primechanie - cement Certain produced by previously approved regulations to revision or withdrawal, there remains a division of cement compressive strength according markam.5 The speed of hardening cement civil divided on: - normally-- with rationing strength at the age of 2 (7) and 28 days - bystrotverdeyushchie - with rationing strength at the age of 2 days, increased in comparison with the normally-and 28 sut.6 in terms of setting cements are divided into: - medlennoskhvatyvayuschiesya - with normalized period of initial setting for more than 2 hours - normalnoskhvatyvayuschiesya - with controlled start date setting from 45 minutes to 2 hours; - quick-setting - with normalized period of initial setting less than 45 Min.7 Classification of cements for special requirements, if necessary, set in the regulations for specific Rational tsementov.8 kinds of special cements scope should be given in the regulations on cement particular species or a particular group of products. General technical requirements. Cement shall be made in accordance with the requirements of the standard and regulations for cement particular species or group specific to the product of technological regulations approved by the manufacturer. Characteristics. Quality indicators established in the regulations for cement, are divided into mandatory and rekomenduemye.Nomenklatura mandatory quality indicators for cement is given in Table 1.

Наименование показателя, единица измерения	Вид цемента
Прочность на сжатие и (или) изгиб, МПа	Все цементы
Вещественный состав, %	Все цементы
Равномерность изменения объема	Все цементы на основе портландцементного клинкера, кроме тампонажных
Время загустевания, мин	Цементы тампонажные
Плотность цементного теста, г/см3	Цементы тампонажные
Самонапряжение, МПа	Цементы напрягающие
Линейное расширение, %	Цементы расширяющиеся, напрягающие, безусадочные
Тепловыделение, кал/г	Цементы для гидротехнических сооружений
Водоотделение, % или мл	Цементы для строительных растворов, дорожные, тампонажные
Содержание оксида магния МgО в клинкере, %	Все цементы на основе портландцементного клинкера
Содержание оксида серы (VI) SO3, %	Все цементы на основе портландцементного клинкера
Содержание хлор-ионаСl^-, %	Все цементы на основе портландцементного клинкера
Содержание шестивалентного хрома Сr^+6, %	Портландцемент для производства асбестоцементных изделий
Содержание оксида алюминия Аl2O3, %	Все цементы на основе глиноземистого (высокоглиноземистого) клинкера
Минералогический состав, %	Цементы на основе портландцементного клинкера - сульфатостойкие, тампонажные, цементы для труб, шпал, опор, мостовых конструкций
Удельная эффективная активность естественных радионуклидов, Бк/кг	Все цементы

Quality indicators: setting time, fineness, the mobility of cement-sand mortar, the fluidity of cement paste, water repellency, water resistance, sulphate resistance, frost resistance, fire resistance, corrosion resistance, the content of free calcium oxide clinker, alkali oxides and insoluble residue, loss on ignition are recommended.If the development of regulations for new types of cements recommended individual quality parameters can be set as obyazatelnye.Znachenie mandatory and recommended quality parameters set in the regulations for cement particular species or a particular group of products, depending on their destination and to meet the requirements of this standard. Cements based on Portland cement clinker should not contain chlorine ion than 0.1% and sulfur oxide (VI) should be not less than 1.0 and not more than 4.0% of the cement weight. Material requirements. For the production of cement is used: - clinker, produced in accordance with the requirements of production schedules. Clinker normalized mineralogical composition is used in cases when it is stipulated by normative documents on special cements - gypsum in accordance with GOST 4013. Allowed to use other materials containing calcium sulfate, the relevant regulations; - mineral supplements, additives technological and regulatory basic properties of the cement on relevant regulatory dokumentam.Upakovka. 1. Cement is shipped in packaging or without it. When shipped in bulk cement to be shipped in a special transport. 2To cement packaging used: - a five- or six-layer paper bags according to GOST 2226, and sewn or glued with a closed mouth with a valve HM grades, BM or BMP. They can be used in paper bags of foreign production, which quality indicators are not lower than the requirements of GOST 2226 - big bags with a waterproof liner or other packaging which protects the cement from moisture and dirt, according to the relevant regulatory dokumentam.Markirovka.1. Marking cement sacks produced on each bag in any part thereof. When packing cement in flexible containers labeling is applied to the label to invest in a special pocket, available in soft container. Allowed to be marked with indelible ink on the side surface of the soft container in any of its parts. 2 marking shall be distinct and shall contain: - name of the manufacturer and its trademark - the symbol of cement and (or) its full name in accordance with the regulations; - Strength class (brand) cement, if the standard document provided for the division on the strength classes (grades); - designation of the normative document on which the supply of cement; - the average net weight of cement in the package or the net weight of the cement in the vehicle - a sign on delivery of conformity certified cement (if it is provided by the certification system).