How the strength of cement stone is generated

The strength of cement stone is generated by the reaction of cement and water to form c-s-h and c-h gels, as the gel continues to be produced, aggregated, cross-linked into a solid network structure, coagulation, hardening, and then it has strength.

Refers to the hardened cement slurry, called cement stone, is a heterogeneous body composed of cement, unhydrated cement particle core, capillary pores, etc.

These include various hydration products and residual clinker minerals, as well as water condensed in the pores. It has a certain mechanical strength and porosity, and its shape and many properties are similar to those of natural stone, so it is collectively called cement stone. Strength and durability are important indicators to evaluate the performance of cement stone.

Intensity before 28 days is often referred to as early intensity, and intensity before 28 days and beyond is referred to as late intensity. Durability is mainly measured by impermeability, frost resistance and corrosion resistance to environmental media.

The engineering properties (strength and durability) of cement stone are determined by the structural composition of cement stone, i.e. by the type of hydrate, the relative content of hydrate, and the size, shape and distribution of pores. The type of hydrate depends on the cement variety, the relative content of hydrate depends on the degree of hydration, and the size of the pores determines the size of the water-cement ratio.

1.When the water-cement ratio is the same, the higher the degree of hydration, the more hydrate in the cement-stone structure, and the amount of capillary and unhydrated cement is relatively reduced. The cement stone structure is dense, high strength and good durability.

2.For cement stone structures with the same degree of hydration but different water-cement ratios, the larger the water-cement ratio, the proportion of capillary pores increases relatively, so the strength and durability of the cement stone decrease.

1. The ratio is different, and the cement content of cement stabilized gravel is generally between 3% and 6%, which is less than the cement content of concrete, and does not belong to concrete. The amount of cement per cubic meter of concrete can be divided into poor concrete, Chunhui and rich concrete, etc., and the cement content of concrete is more than that of cement stabilized gravel cement. 2. The uses are different, concrete is much more extensive, and cement stabilized gravel is mainly for paving.

Cement-stabilized gravel is made of graded gravel as aggregate, using a certain amount of cementitious material and sufficient mortar volume to fill the void of the aggregate, and paving and compacting according to the principle of intercalation. Its compaction is close to compactness, and its strength mainly depends on the principle of intercalation and locking between the gravel, and at the same time, there is enough mortar volume to fill the voids of the aggregate. Its initial strength is high, and the strength increases with the age and quickly forms a plate, so it has high strength, impermeability and frost resistance.

The amount of cement stabilized gravel cement is generally 3% to 6% of the mixture, which is higher than that of other subgrade materials. The cement stabilized gravel is not muddy in the rain after survival, and the surface is solid, which is an ideal base ear bar material for high-grade pavement.

The strength of cement refers to the ability of cement mortar hardening test body to withstand external damage, which is expressed by MPA (megapascal). It is one of the important physical and mechanical properties of cement. According to the different forms of force, cement strength is usually divided into three types: compressive strength, flexural strength and tensile strength.

The maximum stress of the cement mortar hardened test body when it is subjected to compressive failure is called the compressive strength of cement; The maximum stress of the cement mortar hardening test body when it is subjected to bending failure is called the flexural strength of cement; The maximum stress of the cement mortar hardening test body when it is subjected to tensile failure, and this gear is called the buried tensile strength of cement.

Since the strength of cement increases gradually during the hardening process, the curing age of the strength must be stated at the same time when the strength is mentioned in order to be compared.

Portland cement has the characteristics of fast hardening and early strength, and the 3D compressive strength can reach more than 50% of 28D, and the study shows that most cement production enterprises in China still use the process of mixing and grinding the mixed material with cement clinker, so that the particle size of the mixed material is coarse, and the activity of the mixed material can not be fully exerted, so among all the influencing factors, the mixed material content has the most obvious impact on the strength of cement. In this way, for Portland cement without mixed materials, its physical cement strength grade is higher, and basically the ISO strength is above.

Studies have shown that the wear resistance of cement has a good correlation with the strength of cement. Due to the high strength of Portland cement, therefore, Portland cement has good wear resistance.

Dear, hello, I am glad to answer for you: the factors of the strength of the cement stone after the hardening of the shadow nucleus are as follows: the strength of the mixed release ten mainly depends on the strength of the cement stone and its strength with the surface of the aggregate, and the strength of the old cement stone and its bonding strength with the aggregate are closely related to the mud strength grade, water-cement ratio and aggregate properties.

In addition, the strength of concrete is also affected by the construction quality, curing conditions and age.

Summary. After the pavement is put into operation, under the repeated action of vehicle load, cement stabilized gravel strength characteristics and design standard 50 compounds, the accumulation of micro-damage of the base layer expands, and when the damage accumulates to a certain extent, it will lead to the fatigue fracture of the cement stabilized gravel base.

Hello, I have seen your question and am sorting out the answer, please wait for a while After the road surface is put into operation, under the repeated action of vehicle load, cement stabilized gravel strength characteristics and design standard 50 compound action, the accumulation of micro damage of the base layer expands, and when the damage accumulates to a certain extent, it will lead to the fatigue fracture of the cement stabilized gravel base.

The strength grade of cement is a sign of cement strength, the measurement index is the compressive strength of yard round cement, and the testing standard is mainly the strength of cement mortar after 28 days of induration. For example, if the compressive strength after 28 days is detected, the strength grade of the water and mud is set as grade or grade. Cement has

5r
.5r
.5r
.

5R eight strength levels. The strength grade with r indicates that the cement is early strength cement. Strength Rating

The 5R can be used in some house construction. Above the strength grade, it can be used for the construction of large bridges, seepage beams or workshops, as well as some important pavements and fabrication of prefabricated components. There are no very detailed regulations on the use of cement strength grades, and generally speaking, clear regulations are given in the design drawings.

In civil construction projects, ordinary Portland cement and slag Portland cement are generally used. Strength grades are commonly used ,

Summary. Hello dear! In concrete, both cement and stone are important components, and both of them have an important impact on the strength of concrete.

Stone can provide the skeleton of concrete and increase the compressive capacity of concrete; Cement, on the other hand, binds the stones together to form a solid whole. Therefore, stone plays a very important role in the strength of concrete, and its contribution is greater than that of cement. However, the mix ratio is also an important factor affecting the strength of concrete, and a reasonable mix ratio can not only ensure the stability of concrete strength, but also improve the durability and service life of concrete.

Hello dear! In concrete, cement and stone are both important components of fiber return, and they have an important impact on the strength of concrete. Stone can provide the skeleton of concrete and increase the compressive capacity of concrete; Cement, on the other hand, binds the stones together to form a solid whole.

Therefore, stone plays a very important role in the strength of concrete, and its contribution is greater than that of cement. However, the mix ratio is also an important factor affecting the strength of concrete, and a reasonable mix ratio can not only ensure the stability of concrete strength, but also improve the durability and life of concrete.

Dear, it's a stone.

Hello. I'm Little Crispy. We'll be happy to answer for you.

Pro-Jane rotten. The mix ratio of concrete (concrete) mainly refers to the mix ratio of cement, water, sand and gravel. Among them, cement, as the main cementitious material of concrete, can make concrete condense into a hard spine stone-like substance.

Water, sand and gravel increase the fluidity, fill the voids and increase the strength of the concrete, respectively. Therefore, for the concrete mix ratio of cement and stone in different proportions, its strength is also different. Generally speaking, the higher the cement content, the greater the strength of the concrete.

However, if the ratio of cement and stone is reasonable, the presence of stone can improve the compactness and hardness of concrete, and then improve the strength of concrete. In general, it is true that stones can increase the strength of concrete, but this does not mean that the more stones, the stronger the concrete. Because stones that are too large or too small will affect the strength and quality of concrete.

In the design of concrete mixture, it is necessary to carry out a reasonable mix ratio design according to the specific use environment and requirements, so as to obtain a more solid and durable concrete structure.