موقعك الحالي:صفحة رئيسية>المنتجات
2000-3-17 Composition of cement. Introduction Portland cement gets its strength from chemical reactions between the cement and water. The process is known as hydration.This is a complex process that is best understood by first understanding the chemical composition of cement.
Read More
2012-11-24 Cement composition: Cement is produced burning calcium carbonate found in lime stone or chalk, and silica, alumina and irobn oxide found in clay and shale at about 1400 °c. The materials sinter and partially fused to form clinker. The clinker is cooled and ground to a fine powder with some gypsum, resulting in ordinary Portland cement (OPC).
Read More
Bending strength and phase composition of cement stone subjected to loading at an early stage @inproceedings{Galkin2018BendingSA, title={Bending strength and phase composition of cement stone subjected to loading at an early stage}, author={Yu. M. Galkin and S. Udodov}, year={2018} } Yu. M. Galkin, S. Udodov; Published 2018; Materials Science
Read More
cement stone structure due to the layered structure and low strength. Therefore, in order to improve the strength of concrete and reduce the negative effect of CH (particularly large crystals) on the strength of cement stone active mineral additives binding CH into hydro-silicate structures
Read More
2014-1-30 The raw materials used for the manufacture of cement consist mainly of lime, silica, alumina and iron oxide. These oxides interact with one another in the kiln at high temperature to form more complex compounds. The relative proportions of these oxide compositions are responsible for influencing the various properties of cement; in addition to rate of cooling and fineness of grinding. Table 1.4 shows the approximate oxide composition limits of ordinary Portland cement.
Read More
The influence of polycarboxylate superplasticizerson composition changes of silicate and aluminate cement phases is analyzed. The retarding effect of organic additives on silicate phases hydration and stabilizing effect of additives on calcium metastable hydroaluminates and ettringite isestablished
Read More
Corpus ID: 59033048. The Influence of Plasticizers on the Composition of Cement Stone Hydration Products Tarakanov @inproceedings{Vyacheslavovich2016TheIO, title={The Influence of Plasticizers on the Composition of Cement Stone Hydration Products Tarakanov}, author={Oleg Vyacheslavovich and Belyakova Elena Aleksandrovna and Kalashnikov Vladimir Ivanovich and Grintsova Olga Vasilyevna
Read More
2020-10-2 1: 1.5 cement sand mortar. 8. Stone masonry in foundations and superstructure of ordinary buildings. 1:2 fat lime surkhi mortar or 1 part lime, 1 part surki and 1 part sand. 9. Laying fire bricks. Fire resisting, mortar consisting of 1 part of aluminous cement to 2
Read More
Abstract—We have studied structure formation of cement stone with the use of silica-containing and inert additives and mechanochemical activation. Rational compositions and the particle size composition of composite binders have been determined by X-ray diffraction, differential thermal analysis, and microstructural analysis, which makes it possible to obtain preset physicomechanical ...
Read More
composition of hydrated phases of cement stone a series of X-ray experimental studies on diffractometer DRON-7 was carried out in the range of Bragg angles of 10-75° to the shooting with measuring step 0,05°. The research was done on the samples aged 6 months, because by this time most of crystalline hydrate phases of cement stone are formed.
Read More
2014-1-30 modern cement is about 45 per cent and that of C2S is about 25 per cent. The calculated quantity of the compounds in cement varies greatly even for a relatively small change in the oxide composition of the raw materials. To manufacture a cement of stipulated compound composition, it becomes absolutely necessary to closely control the oxide
Read More
The article deals with the results of comparative tests of the phase composition of cement stone distinguished by strength under bending and compression. The comparison has been made between samples subjected to early loading and control samples. An increase in tensile strength in bending of samples subjected to early loading was recorded.
Read MoreThe influence of polycarboxylate superplasticizerson composition changes of silicate and aluminate cement phases is analyzed. The retarding effect of organic additives on silicate phases hydration and stabilizing effect of additives on calcium metastable hydroaluminates and ettringite isestablished
Read MoreStructure and composition of conventional portland concrete. Conventional concrete is a conglomerate of hydraulic (Portland) cement, sand, stone, and water. It was developed approximately 150 years ago to imitate natural stone while providing less labor
Read More
2020-3-28 composition of the Portland cement hydration products. The change in the phase composition of the cement stone has a natural effect on the durability of products. Hence, it is advisable to establish the peculiarities of the influence of various nBHS on the hydration processes of Portland cement and phase composition of nanomodified cement stone. 2.
Read MoreThe content of the colloid additives in cement stone was optimized as a result of the conducted experimental studies, it was determined that the kinetics of cement strength setting depends on the type and amount of sols. The content of sols in cement stone is about thousand fractions of binder mass, i.e. its strength increases at the microlevel.
Read More
2021-7-23 Composition of Ordinary Cement: The ordinary cement contains two basic ingredients, namely, argillaceous and calcareous. In argillaceous materials, the clay predominates and in calcareous materials, the calcium carbonate predominates. A typical chemical analysis of good ordinary cement along with the desired range is given in table 6-1.
Read More
2021-7-24 Composition: The essential mineral of all the sandstones is Quartz (SiO 2).Among the accessory minerals, micas, felspars, and dark minerals are sometimes present. In cemented varieties of sandstones, the cementing material may be
Read More
Tested are 15 series of samples of cement stone with W/C ratio range between 0,18 and 0,27 and SP C-3 between 0 and 1.0 % by cement weight. Comparing the phase composition of cement stone after 28 days of hardening with that of 4,5 years, it was found that at first the C3SH2 phase, particularly enriched with calcium oxide, is formed, which ...
Read More
The article deals with the results of comparative tests of the phase composition of cement stone distinguished by strength under bending and compression.... DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
Read More
Strength characteristics of the cement stone with the composite dope were studied and it was established that a level of the intensification of a gain in the strength is rather significant and by the seventh day the hardening exceeds the values peculiar for the dope-free compositions at
Read More2014-1-30 modern cement is about 45 per cent and that of C2S is about 25 per cent. The calculated quantity of the compounds in cement varies greatly even for a relatively small change in the oxide composition of the raw materials. To manufacture a cement of stipulated compound composition, it becomes absolutely necessary to closely control the oxide
Read MoreStructure and composition of conventional portland concrete. Conventional concrete is a conglomerate of hydraulic (Portland) cement, sand, stone, and water. It was developed approximately 150 years ago to imitate natural stone while providing less labor
Read More2021-7-24 Composition: The essential mineral of all the sandstones is Quartz (SiO 2).Among the accessory minerals, micas, felspars, and dark minerals are sometimes present. In cemented varieties of sandstones, the cementing material may be
Read More
A patented composition of the composite material is developed for the innovative construction industry based on Portland cement and polyvinyl acetate dispersion. By modifying the phase boundary of the colloidal system, the proposed composite has the required plastic strength, high setting rate, high fast strength, crack resistance, and a number ...
Read More
2 天前 Cement, as a binding material, is a very important building material. Almost every construction work requires cement. Therefore, the composition of cement is a matter of great interest to engineers. For understanding cement composition, one must know the functionality of Cement
Read More
2018-4-4 We first discuss cement production and special nomenclature used by cement industrialists in expressing the composition of their cement products. We reveal different types of cement products, their compositions, properties, and typical uses. Wherever possible, we tend to give reasons as to why a particular cement
Read More
2013-10-31 capillary pores of the cement stone and concrete. Properties of concrete, its strength and corrosion resistance are the function of composition and porosity and as well as hardening, technological and exposure conditions [1]. At same time, these properties depend on the chemical and mineralogical composition of the cement used.
Read More
2019-12-10 The cement used in this research was G-class oil well cement (Jiajiang Cement Company, China); its chemical composition is shown in Table 1.Additionally, according to API RP-10B , the experimental cement slurry was mixed at a water/cement ratio of 0.44 by weight.Chemically pure BZC (Chengdu Kelong Chemical Reagent Factory, China) was added as the corrosion inhibitor; its
Read More
الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
الاتصال: 0371-86549132.