2024 Author: Beatrice Philips | [email protected]. Last modified: 2024-01-18 12:09
Almost every person has had a moment in their life associated with construction. This could be building a foundation, laying tiles, or pouring a screed to level the floor. These three types of work combine the obligatory use of cement. Portland cement (PC) M500 is considered its most irreplaceable and durable type.
Compound
Depending on the brand, the composition of the cement also varies, on which the characteristics of the mixture depend. First of all, clay and slaked lime are mixed, the resulting mixture is heated. This forms a clinker, to which gypsum or potassium sulfate is added. The introduction of additives is the final stage of cement preparation.
The composition of PC M500 includes the following oxides (as the percentage decreases):
- calcium;
- silicic;
- aluminum;
- iron;
- magnesium;
- potassium.
The demand for M500 Portland cement can be explained by its composition. The clayey rocks underlying it are completely environmentally friendly. They are also resistant to aggressive environments and corrosion.
Characteristics
PC M500 has fairly high quality characteristics. As mentioned above, it is especially appreciated for its reliability and durability.
The main characteristics of Portland cement:
- quickly sets and hardens from 45 minutes after use;
- transfers up to 70 freeze-thaw cycles;
- able to withstand bending up to 63 atmospheres;
- hygroscopic expansion no more than 10 mm;
- fineness of grinding is 92%;
- the compressive strength of the dry mixture is 59.9 MPa, which is 591 atmospheres.
The density of cement is an informative indicator that indicates the quality of the binder. The strength and reliability of the structure being built depends on it. The higher the bulk density, the better the voids will be filled, which in turn will reduce the porosity of the product.
The bulk density of Portland cement varies from 1100 to 1600 kg per cubic meter. m. For calculations, a value of 1300 kg per cubic meter is used. m. The true density of the PC is 3000 - 3200 kg per cubic meter. m.
The shelf life and operation of cement M500 in bags is up to two months. The information on the packaging usually says 12 months. Provided that it will be stored in a dry, closed room in a sealed package (bags are wrapped in polyethylene).
Regardless of the storage conditions, the characteristics of Portland cement will decrease, so you should not buy it "for future use." Fresh cement is better.
Marking
GOST 10178-85 dated 01.01.1987 assumes the following information on the container:
- brand, in this case M500;
- number of additives: D0, D5, D20.
Letter designations:
- PC (ШПЦ) - Portland cement (slag Portland cement);
- B - fast hardening;
- PL - the plasticized composition has high frost resistance;
- H - the composition complies with GOST.
On September 1, 2004, another GOST 31108-2003 was introduced, which in December 2017 was replaced by GOST 31108-2016, according to which the following classification exists:
- CEM I - Portland cement;
- CEM II - Portland cement with mineral additives;
- CEM III - slag portland cement;
- CEM IV - pozzolanic cement;
- CEM V - composite cement.
The additives that cement must contain are regulated by GOST 24640-91.
Additives
The additives included in the composition of cement are divided into three types:
- Additives of material composition … They influence the process of cement hydration and hardening. In turn, they are divided into active mineral and fillers.
- Additives regulating properties … The setting time, strength and water consumption of cement depend on them.
- Technological additives … They affect the grinding process, but not its properties.
The number of additives in the PC is characterized by marking D0, D5 and D20. D0 is a pure mixture that provides the prepared and hardened mortar with resistance to low temperatures and moisture. D5 and D20 mean the presence of 5 and 20% additives, respectively. They contribute to increased resistance to moisture and cold temperatures, as well as resistance to corrosion.
The additives improve the standard characteristics of Portland cement.
Application
The range of application of the PC M500 is quite wide.
It includes:
- monolithic foundations, slabs and columns on a reinforcing base;
- mortars for plaster;
- mortars for brick and block masonry;
- road construction;
- construction of runways at airfields;
- structures in the area of high groundwater;
- structures requiring fast solidification;
- construction of bridges;
- railway construction;
- construction of power lines.
Thus, we can say that Portland cement M500 is a universal material. It is suitable for all types of construction work.
It is quite simple to prepare a cement mortar. 5 kg of cement will require from 0.7 to 1.05 liters of water. The amount of water depends on the required thickness of the solution.
Proportions of the ratio of cement and sand for different types of construction:
- high-strength structures - 1: 2;
- masonry mortars - 1: 4;
- others - 1: 5.
During storage, cement loses its quality. So, in 12 months it can turn from a powdery product into a monolithic stone. Lumpy cement is not suitable for mortar preparation.
Packing and packaging
Cement is produced in large quantities. Immediately after production, it is distributed in sealed towers with a powerful ventilation system that lowers the level of humidity in the air. There it can be stored for no more than two weeks.
Further, according to GOST, it is packaged in paper bags containing no more than 51 kg of gross weight. The peculiarity of such bags is the polyethylene layers. Cement is packaged in 25, 40 and 50 kg units.
The packaging date is mandatory on the bags. And the alternation of paper and plastic layers should become a reliable protection against moisture.
As mentioned earlier, cement must be stored in an airtight container that provides waterproofing. The tightness of the package is due to the fact that, upon contact with air, the cement absorbs moisture, which negatively affects its properties. Contact between carbon dioxide and cement leads to a reaction between the components of its composition. Cement should be stored at temperatures up to 50 degrees Celsius. The container with cement must be turned over every 2 months.
Tips
- As mentioned above, cement is packed in bags from 25 to 50 kg. But they can also supply material in bulk. In this case, the cement must be protected from atmospheric precipitation and used as soon as possible.
- Cement must be purchased shortly before construction work in small batches. Be sure to pay attention to the date of manufacture and the integrity of the container.
- The price of Portland cement M500 per bag of 50 kg ranges from 250 to 280 rubles. Wholesalers, in turn, offer discounts in the region of 5-8%, which depends on the size of the purchase.
Recommended:
Cement M400: Technical Characteristics And Density Of Bulk PC In Bags, Weight 1 M3 Of Grade D20
Cement M400: what do the letters and numbers in the marking mean? What are the technical characteristics and density of bulk PC in bags? What weight of cement is required to prepare 1m3 of concrete? What are the advantages of the D20 brand?
Portland Cement Grade 400: Technical Characteristics, Mixture Of M400 D20 And D0, GOST For PC
Portland cement 400 has optimal technical characteristics to create strong structures. M400 mixtures have different markings: D0, D5, D20 and D20B. What do they mean? What is the GOST for the PC? What are the advantages of M400 Portland cement?
Cement M500: The Density And Characteristics Of The Bulk Mixture Of The M500 Brand, White Euro Cement In Bags Of 50 Kg, The Specific Gravity Of The Composition D0 With The PC Marking
Cement M500 is very popular and in demand in construction. This is due to the fact that the density and characteristics of the M500 bulk mix meet the requirements even for extreme environmental conditions. Where is the best place to apply a hydrophobic plastic compound? What is the best way to store white Euro cement in 50 kg bags?
Density Of Crushed Stone: Bulk And True Density Of Crushed Stone 5-20 Mm, 40-70 Mm And Other Fractions, Table And GOST, Average Density Of Black And Other Crushed Stone
Crushed stone density: bulk and true. The density of crushed stone is 5-20 mm, 40-70 mm and other fractions, table and GOST, average density of black and other crushed stone
Density Of Expanded Clay: Bulk And True, Density Of Expanded Clay With A Fraction Of 5-10 And 20 Kg Per M3, Expanded Clay With A Density Of 400-600, Other Options
During construction work with expanded clay, you need to know its density. The main types of density are bulk and true. So what does it depend on and how to determine the density of expanded clay with a fraction of 5-10 and 20 kg per m3?
