How does cement mix strongly? The strength of mixed mortar is greater than that of cement mortar

Which is the greater strength of cement mortar or cement mixed mortar (lime added to the ordinary ratio) after reaching the standard curing age? Technical specification for testing the compressive strength of masonry mortar by penetration method JGJT136-2001, Appendix D The comparison of the same strength is analyzed in the conversion table of the compressive strength of the mortar (such as strength, the penetration degree of cement mixed mortar is 5mm, and the penetration degree of cement mortar, the conclusion is that the cement mixed mortar is greater than the cement mortar, and the personal understanding is that the cement mortar is reduced by the strength of the lime.

Cement is worried about shrinkage cracks, and the conditions for maintenance should be good (temperature and humidity), you try to do it yourself first, and then adjust it repeatedly. If you want cement to be strong, then use high-strength cement.

Personally, I think that the stone powder is not very good, there is too much gypsum, the cement will slow down, the stability is not good (easy to crack), and it is relatively better to use sand.

I have a big customer in Shenzhen, Guangdong Province who makes these handicrafts, and their products are exported to the United States and the United Kingdom, which is the GRC cement products such as water flow bonsai. Because their cement products are often exposed to water, they are easily alkaline. They use our company's cement alkali inhibitor EL1290 EL1281 products.

What you do is not only to consider the strength of the cement, but also to prevent cracking and control the problem of pan alkali.

It is not accurate to say that mixed mortar and cement mortar are strong, and both have their own strength, and consumers can choose according to their own needs.

1. The effect is different.

In dry areas, it is better to use a mixed mortar, because the water retention effect of lime will be much better than that of cement. In wet areas, it is better to use cement mortar, such as foundations, pools, etc.

The southern region is generally more humid, so it is best to choose cement mortar when construction.

2. Different uses.

The former is often used to build masonry on the ground, while the latter is often used to build walls, foundations, etc., and can also be used for indoor and outdoor plastering construction, and can also be used to pave tiles. When building a digester, a mixed mortar is usually used.

The hazards of the Mortar King

Mortar King is also known as rock spirit, cement plasticizer, etc. It acts on cement and is a substance used to improve the performance of cement mortar, which belongs to the category of concrete admixtures. Mortar King can replace lime with 1:1000, which is mainly suitable for masonry, plastering and other links of various industrial and civil buildings, which can save a lot of money for the construction unit.

Mortar King has the effect of improving the water retention of mortar. When building a wall, the water retention effect of the mortar king can ensure that the mortar is soft, has good fluidity, strong adhesion, and can reduce the landing ash, thereby reducing costs. The requirements for the wall surface are low when plastering, the water leakage rate is low, and it does not precipitate for 7 hours, so it does not have to be stirred repeatedly, which accelerates the construction speed and improves the construction efficiency.

The mortar king has an early strength effect. Add the mortar prepared with the mortar king, it has the effect of affinity and strengthening with cement, by stimulating the activity of cement, it reaches a certain strength after 6 hours of use, and its durability is significantly improved compared with ordinary mortar, and the strength effect is more in the later stage.

The cement strength is too high, and high-strength concrete can be formulated, and,The degree of shrinkage cracking of concrete will be reduced。However, it is more difficult to prepare ordinary concrete because of the large amount of water leakage. Compare the use of cement to prepare low-strength grades of concrete.

The strength of concrete has a great impact on the overall service and use in the future, and the high strength is the longer the service life, and the wear and compression resistance is also correspondingly higher; If the strength of the concrete is too weak, it is easy to bring a series of shortcomings such as sand and ash, cracking, poor wear resistance and impermeability, and a large amount of money is needed to renovate it.

Influencing factors

1. Cement strength grade and water-cement ratio.

The higher the cement strength grade, the higher the cement strength; On the premise of ensuring dense molding, the smaller the water-cement ratio, the higher the strength.

2. Aggregate variety, particle size, gradation, impurities, etc.

When using gravel and sand with large particle size, good gradation and clean, the water-cement ratio can be reduced, and the interfacial bond strength can be improved, so the strength of concrete is high.

3. Temperature and humidity during maintenance.

The effect of humidity on the strength of concrete is achieved by affecting the hydration and hardening of cement. When the temperature is suitable and the humidity is high, the strength develops quickly, and on the contrary, it is not conducive to the growth of concrete strength.

The amount of cement per unit volume of concrete is too small, resulting in the decline of concrete process performance (poor water leakage, rough appearance, poor color, large quality fluctuations), or the process performance can not fully meet the needs. If the minimum amount of cement per unit volume of concrete is reached, the concrete grade is too high, and the economy is not cost-effective, resulting in waste.

The strength of the cement is too high, congratulations, you can formulate high-strength concrete, and the degree of shrinkage and cracking of the concrete will be reduced. However, it is more difficult to prepare ordinary concrete because of the large amount of water leakage. You can imagine the situation of using cement to prepare low-strength grade concrete.

What will high strength cause wall cracking, sudden brittle failure, etc., under the condition of meeting your strength requirements, appropriately reduce the amount of cement and adjust the mix ratio.

As a result, there are many temperature cracks in the concrete itself.

The amount of high-strength concrete cement should not be more than 550 kg, and the admixture with the material should not exceed 600 kg. High-strength concrete refers to concrete with a strength grade of C60 and above, and concrete with a strength grade of C100 or above is called ultra-high-strength concrete. It is made of cement, sand, stone raw materials plus water reducer or at the same time plus fly ash, F ore powder, slag, silica powder and other mixtures, through conventional production to obtain high-strength concrete.

As a new building material, high-strength concrete has been widely used in high-rise building structures, long-span bridge structures and some special structures due to its advantages of high compressive strength, strong deformation resistance, high density and low porosity.

The biggest feature of high-strength concrete is that it has high compressive strength, which is generally 4 6 times that of ordinary strength concrete, so it can reduce the cross-section of the component, so it is most suitable for high-rise buildings.

According to JGJ55 2011 Ordinary Concrete Mix Design Regulations 7 3 2 Article 3 stipulates: the amount of high-strength concrete cement should not be greater than 500kg per cubic meter.

Concrete refers to a mixture made of cementing materials (organic, inorganic or inorganic compounds with reed-back mold machines), granular aggregates, water, and chemical admixtures and mineral admixtures that need to be added in appropriate proportions, or composite materials with a stacking structure after hardening (usually cementitious materials, water, fine aggregates, coarse aggregates, admixtures and mineral admixtures when necessary), and are formulated in appropriate proportions.

Cement, commonly known as ash, red mud, and English mud, is a general term for cementing materials that leak from civil engineering, and can be divided into hydraulic cement and non-hydraulic cement according to the different cementing properties.

The 28-day strength of cement is up to 53, and the concrete made of C50 with cement can reach 60 strength. High-grade concrete needs to use high-grade cement, such as cement.

The correct statement is: cement of the same grade can make high-grade concrete with greater strength than cement.

In construction projects, cement and concrete are two very important materials. They both have high strength and durability, but which material is stronger?

First of all, let's take a look at the orange or cement. Cement is a powdery substance made from calcined materials such as lime and clay. During construction, cement is mixed with sand, gravel and other materials to form concrete.

Cement has high strength and hardness and can resist pressure and shear forces. It also has good durability and anti-aging ability, and can be used for a long time in different environments. Therefore, cement plays a very important role in construction projects.

Next, let's take a look at concrete. Concrete is made by mixing cement, sand, gravel and other materials according to a certain ratio. Concrete has high strength and stability and can resist a lot of pressure and shear forces.

It also has good durability and anti-aging ability, and can be used for a long time in different environments. Concrete can also be supplemented with other materials, such as rebar, as needed, to improve its strength and stability.

In summary, both cement and concrete have high strength and durability. However, since concrete contains cement, the concrete will be stronger than when cement is used alone. Therefore, it can be concluded that the strength of concrete is higher than that of cement.

Of course, in specific projects, it is also necessary to choose the use of cement or concrete according to different situations. For example, in some cases where special strength is required, it may be necessary to use separate cement or add other materials to enhance the strength of the concrete. Therefore, in practical application, it needs to be selected and adjusted according to the specific situation.

In short, both cement and concrete are very important building materials. Through their understanding and application, it can provide higher strength and stability for construction projects, so as to ensure the safety of people's lives and property.

Summary. To prepare high-strength concrete, we must first have the best raw materials. Sand:

Low mud content; Stone: Good grading. Admixture:

Add high-quality fly ash or mineral powder, and if necessary, silica fume. Admixtures: polycarboxylic acid superplasticizer (6000 8000 yuan tons), high concentration naphthalene superplasticizer (2300 2600 yuan tons) better polycarboxylic acid superplasticizer are:

BASF, Sika, Yongyang, etc., depending on your local ** business.

To prepare high-strength concrete, we must first have the best original and informed materials. Sand: low mud content and fierce dust; Shi:

Good grading. Admixture: mixed with high-quality fly ash or mineral powder, if necessary, with silica fume.

Admixtures: polycarboxylic acid superplasticizer (6000 8000 yuan ton), high concentration naphthalene superplasticizer (2300 2600 yuan ton) better polycarboxylic acid superplasticizer are: BASF, Xijuchaka, Yongyang, etc., depending on your local business.

The cement floor is peeled, and a thin layer needs to be filled, so what can be stronger with ordinary cement?

First, the cement pavement rapid repair method 1, the mortar repair method will appear on the concrete ground surface peeling, freeze and thaw the use of mortar repair method, which is also a commonly used method now, buy some cement concrete pavement rapid repair repair pavement, but the cost of this way is very high. 2. Composite repair methodComposite repair method is a way that has become popular in recent years, it is mainly used in concrete peeling, hemp surface and frost-resistant repair, and this method must first use reinforcing materials and then reinforce the foundation of the concrete floor. 3. Infiltration repair method, such as concrete ground only appears some lime sand, the cavity world directly uses the infiltration repair method, this method of concrete ground its appearance will generally not change greatly, but the concrete strength is directly improved, after the later repair, the next day's road surface will not be damaged with a screwdriver.

Second, how to deploy cement pavement repair materials 1, first of all, add water and then mix the material and water together, and then add water is generally 17% of its effect is very good, but it is also necessary to install the place where Wooki limb is repaired, for different dilution its requirements can be appropriately adjusted, and the amount of water is generally controlled to about 15% to 20%. 2. Stir evenly when stirring, and after stirring, whether there are no dry powder balls and bubbles, if there are dry powder balls and bubbles, then you can stir after standing for one minute, and the stirring time is usually about three minutes, but the time can not be too long. 3. When mixing materials, water should be added first and then added, so as to save time and effort, that is because the solidification time of cement pavement repair material is relatively short, and the amount of one-time mixing can not be too large, according to the deployment of the front answer and the construction progress, the construction should be completed within 20 minutes of each mixing material.

The hardness of cement is related to the material it is mixed with, and in general, in construction and engineering, cement is often mixed with sand, gravel or gravel to form concrete. Concrete is a building material with high strength, durability, easy to manufacture and use, and cement is one of the main components of concrete, and its role is to bond sand, stone or gravel together to form a strong structure.

If cement is mixed with graphene, a much stronger composite material can be obtained. Graphene is a very tough material with excellent electrical and thermal conductivity, so mixing it with cement can enhance the hardness and strength of concrete. Graphene cement composites have excellent compressive strength, crack resistance, waterproof properties and durability, and can be used for the reinforcement of buildings and the prevention of damage, as well as the manufacture of high-end industrial equipment and ships.

In addition, there is a hybrid material called steel fiber cement, which is a metal material with high strength and toughness, and adding to cement can greatly enhance the strength and durability of concrete. Steel fiber cement materials are widely used in rail transit, tunnels and bridges, etc., with good impact resistance and sound insulation effects.

In short, the mixing of cement and different materials can obtain mixed materials with different hardness and strength, and concrete is the most widely used cement mixed material, which plays an important role in construction and infrastructure engineering. <>