NC cement (straining) and its use in construction work

NC cement, sometimes referred to as non-cementitious grout or non-shrink cement, is a specialty building material valued for its special qualities. NC cement does not shrink during the curing process like regular cement does. Because of this feature, it’s perfect for certain uses where preserving the original volume is essential, like precise grouting and structural repair.

The main benefit of NC cement is its capacity to create a strong, long-lasting bond without the typical problem of shrinkage. By keeping the filled spaces compact and solid, it guards against cracks and gaps that can jeopardize the structural integrity of the building. This is especially helpful for tasks where longevity and accuracy are crucial, like underpinning foundations, filling gaps, and anchoring machinery.

NC cement is renowned for its rapid setting time, high strength, and non-shrinking qualities. It is therefore a recommended option for last-minute installations and repairs. For projects that require quick turnaround times without compromising quality, contractors frequently rely on it. Because of its ability to drastically cut downtime, it is an affordable solution for a variety of construction-related situations.

All things considered, NC cement is essential to contemporary building techniques. Its unique qualities offer improved performance and dependability by solving issues that traditional cement frequently causes. NC cement is a useful and adaptable material in the construction industry, whether it is utilized for minor repairs or major infrastructure projects.

Topic NC Cement (Straining) and Its Use in Construction Work
Description NC cement, also known as non-shrink or straining cement, is a type of cement that minimizes shrinkage during the curing process. This makes it ideal for construction projects where tight sealing and minimal movement are crucial.
Uses NC cement is commonly used in grouting, anchoring, and repairing concrete structures. It is also employed in situations where precise alignment and structural integrity are necessary, such as in the construction of bridges, dams, and large infrastructure projects.

Features of the material

The NC cement, also known as straining cement, has a unique astringent composition that is distinguished by its exceptional strength, quick grasp and solidification, and water resistance. The most challenging building environments can benefit from the use of concrete that has been strengthened technically through the addition of straining cement.

The cement’s significant volume increase during solidification is ascribed to expanding compositions. You can already see that the coating has gotten bigger on the third day after the filling. Because the time it takes for this material to reach its strength is orders of magnitude shorter than it is for regular concrete, the buildings’ lifespan is shortened. The fact that the material solidifies quickly without sacrificing the final coating’s quality can also be considered a plus.

The composition of the product

The product is made in compliance with GOST R 56727-2015, "Strengthens Cements," and GOST 31108-2003, "Cements of the General." The following elements are part of its composition:

  1. Portland cement clinker. This is the main component for the preparation of cement NC. Its share in the total composition is at least 67%, it gives the material to resistance to cracks.
  2. Clay -eating slag and special expansion additives. The percentage of these substances in total is 6-20%.
  3. Mineral components based on calcium sulfate, for example, gypsum (up to 10%) and excipients (domain slag and others).

The NC Cement is one of the additional substances that could exist, according to GOST. What matters most is that they don’t shorten the material’s lifespan or cause the reinforcement—which is used in building construction—to corrode.

Application area

The so-called self-plugged concrete, which exhibits no shrinkage during the drying and operating processes, is made using stressing cement. It is perfect for making screeds and foundations because it does not crack after pouring and solidification. In areas with high groundwater tables, the material can be used to reinforce or repair pre-existing foundations and buildings.

Because concrees made of this material are waterproof, they can be used to build pools, plums, collectors, sewer channels, and drains. Waterproofing construction mixtures are designed for buildings that are constructed near water or other aggressive substances, and are based on the NC Cement.

Other contexts in which the material is used:

  • construction of pipelines, structures in areas with a complex relief located in a harsh or changeable climate;
  • the arrangement of structures experiencing large static and dynamic loads;
  • construction and strengthening of water, oil products, chemicals, toxic waste;
  • casting of vertical elements of structures, floor slabs, waterproofing barriers;
  • filling cracks, chips, joints, seams and other defects on any planes;
  • creation of industrial facilities, runways, treadmills, highways, especially undergoing heavy loads;
  • construction of fireplaces, furnaces, boiler rooms;
  • Concreting of basement, basements, garages and other semi -underground and underground buildings.

Additionally, to increase the strength and lower the shrinkage indicator of various ready-made composite mixtures, cement powder is added. The material is generally quite popular in multi-story monolithic construction, but it is also widely used in private development.

Because of its rapid setting time and strong bonding, non-cementitious cement, or NC cement, is a versatile material that is frequently used in construction. NC cement is different from traditional cement in that it is made to bind and strain surfaces without the need for hydration processes. This makes it perfect for uses such as patching, repair work, and joining various building materials. Its robust and long-lasting results in a variety of building projects are ensured by its easy of use, durability, and efficient performance, all of which help to streamline construction tasks.

Types, brands and properties

Every cement must be marked, making it simple to determine the intended use of any given substance. Initially, every package designates the group based on composition (1 – additive-free, 2 – additive-containing). The percentage of impurities is indicated by the letters (a-6-20%, b-21-35%).

The existence of a broad range of funds, each with unique qualities and application specifics, is implied by the NC’s cement:

  • actually straining cement of the NC;
  • clay -means expanding cement of the GGRC/Hz;
  • waterproof expanding cement of the WRC;
  • Expanding Portland cement of the Russian Orthodox Church.

There are four types of straining cements, based on the energy level of self-enforcement:

  • NC-5-self-expression does not exceed 0.7 MPa;
  • NC-10-the indicator is 0.7-2.0 MPa;
  • NC-20-self-expression is 2.0-3.0 MPa;
  • NC-30-the number is 3 MPa or more.

Since other types of material have better technical qualities, the first two types of cement are now used very infrequently. The NC-20 cement is most frequently used in construction. It stands out for being ineffective and ideal for filling mixtures with compensated shrinkage. It doesn’t require additional waterproofing coatings and is an affordable and simple method of working. There are two strength classes for strengthening cement, 32.5 and 42.5, and three subclasses within each: normally hard-willed (n), medium-hardening (C), and fast-hardening cements (b).


The material’s specifications may change based on its particular brand and type. The mean technical attributes of a stinging cement are as follows:

  • The initial setting time is 30 minutes;
  • frost resistance at temperatures up to -30 degrees -1,500 cycles;
  • bending strength after 2 days – 3.8 MPa;
  • compression strength after 2 days – 14 MPa;
  • strength for bend after 28 days – 5.9 MPa;
  • compression strength after 28 days-35-49 MPa;
  • self-expression-0.7-3 MPa;
  • linear expansion indicator-0.3-2%.

Work with the material at between +5 and +35 degrees. It is realized in dry form and packed in compact packages weighing between 25 and 45 kg. Concrete, which is composed of NC cement, has a very low water absorption indicator and low porosity. It can withstand water pressure of up to 20 atmospheres.

Advantages and disadvantages of the material

The material’s suitability for a broad range of construction tasks leads to its classification as universal. It offers numerous other benefits.

  • increases the permissible pressure on the foundation, makes it possible to use raw materials of any type on the upper floors of the building (not only lightweight);
  • seriously increases the strength of structures and buildings;
  • prevents the appearance of microcracks, increases the service life of the structure several times;
  • it is evenly distributed and expanded throughout the volume of the structure, which eliminates the appearance of voids;
  • Fires differ, explosion safety;
  • Safe, does not contain toxic compounds;
  • provides excellent waterproofing properties even without the use of other moisture -resistant materials;
  • It sets very quickly and gains full strength, which reduces labor costs and construction time;
  • characterized by increased bending strength;
  • can be stacked directly on old concrete without reducing the level of adhesion;
  • resistant to low temperatures, changes, humidity, pressure, influence of aggressive liquids.

The material’s drawbacks have as well. Its cost is an order of magnitude (usually 25–30%) more than that of regular cement. Furthermore, dishonest producers frequently sell basic raw materials in place of NC cement by imitating the real thing. Only positive air temperatures are suitable for working with the material, and it is not always possible to introduce the composition of special additives that would enable you to work in a colder climate. Cements of different types cannot be combined with NC cement. In this scenario, its expanding and astringent properties will decrease, and its technical characteristics will suffer.

How to prepare a solution

You must first prepare the river sand, water, and NC cement to get a pourable solution. The latter need to be highly-quality and sifted. After sand and cement are combined in a 1: 2 ratio, cool water is added (about 40% of the dry mixture). It’s important to understand how the manufacturer’s instructions for breeding the solution should be followed when purchasing a finished construction mixture made of straining cement. The average amount of material used per cubic meter is 500 kg. ready-made concrete.

Procedure for use

Before starting work, it is important to carefully prepare new bases or repaired structures. All exfoliating coatings should be removed, wipe the spots of bitumen, oil, fat, oil products, remove the old paint. You also need to get rid of any garbage, dirt, dust, otherwise the strength of concrete adhesion will decrease with the base. If the solution is poured as a screed, the formwork for it is slightly wetted with water. After pouring concrete on the basis of cement of the NC on the second day moisturize the surface, repeating such actions regularly within 14 days. After spraying concrete with water, it is covered with a film so that the liquid does not evaporate too fast.

Because of its special qualities, NC cement, also referred to as straining cement, is an essential component in the construction industry. Because of its quick setting times and strong early strength, it’s a great option for projects requiring quick turnaround times. It is a mainstay in many construction applications, from complex architectural elements to building foundations, thanks to its adaptability and dependability.

The capacity of NC cement to minimize shrinkage and cracking is one of its main benefits. This is especially crucial for structures where longevity and durability are essential. NC cement helps ensure that buildings and other constructions remain structurally sound over time by minimizing these common issues, which lessens the need for frequent repairs and maintenance.

Furthermore, NC cement can be used in a variety of climates and conditions due to its resilience to environmental elements like moisture and temperature changes. Because of its versatility, it can be used in a wide range of geographic locations, guaranteeing that construction projects can be successfully finished regardless of the surrounding conditions.

Using NC cement in building procedures improves the overall efficiency of the project in addition to the quality and longevity of the structures. Because of its quick-setting qualities, construction teams can work more quickly and efficiently while still meeting deadlines without sacrificing the quality of their work. Consequently, NC cement stays the material of choice for engineers and builders who want to complete their projects to the highest standards.

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