What is Apparent Density Bulk Density Bulk Density Porosity, Porosity, Porosity Empty Heart .

Several questions... Come one by one :

Apparent density is the same as bulk density: the mass of a material per unit volume in its natural state.

Bulk density: The weight per unit volume of a bulk material in its natural stacked state is known as bulk density.

Porosity: refers to the percentage of the pore volume in the volume of the material to the total volume of the material.

Porosity: Porosity refers to the percentage of the volume of voids between particles in the stacked volume of a container of bulk materials.

Porosity (hollow heart): The percentage of the sum of the volumes of the holes and grooves of hollow bricks and hollow blocks to the volume calculated by outer dimensions.

The concepts of "bulk density" and "density" are theoretically the same, but the environment in which they are applied is different

1. The bulk density is generally the weight of one cubic meter used in engineering, that is, the weight of the object in the unit volume. Density has a wide range of applications, that is, "mass per unit volume of substance", liquids, solids, and gases can be used.

2. The bulk density is also indicated.

The gravitational properties exhibited by an object due to the gravitational pull of the earth, and for homogeneous fluids, bulk density also refers to the gravitational force acting on a unit volume. Some books use it to denote . In the International System of Units, the unit is: the cattle cubic meter.

For example, under standard conditions, the bulk density of air is Ox cubic meters, and its density is kilogram cubic meters).

3. The two quantities are = numerically

Approximate calculation = 10, but the traditional units are different.

4. There are specific volumes and specific gravity of similar quantities (no longer used).

Summary. Compactness of the material: refers to the proportion of the volume of the solid material part of the material to the total volume of porosity

The ratio of the sum of all pore space volumes in a rock sample to the volume of the rock sample is called the total porosity of the rock, and the filling rate is expressed as a percentage: it refers to the degree to which the bulk material is filled by its particles in a certain stacked volume, and the porosity refers to the proportion of the void volume between the particles of the bulk material in a certain stacked volume.

What are the density, porosity, filling rate, and porosity of the material?

Compactness of the material: refers to the ratio of the volume of the solid material part of the material to the total volume of porosity: the ratio of the sum of the volume of all pore spaces in the rock sample to the leakage product of the rock sample, which is called the total porosity of the rock, and the filling rate is expressed as a percentage

It refers to the degree to which the bulk material is filled by its particles in a certain stacked volume, and the porosity refers to the proportion of the void volume between the excited particles in a certain stacked volume of the bulk material to return to lead.

Method for improving the compactness of concrete: (1) Adjust the mix ratio of concrete, improve the compactness, reduce the water-cement ratio, reduce the dry and low porosity, and reduce the water seepage channel. Appropriately increase the amount of cement, sand rate and lime-sand ratio, and form a good quality and sufficient thickness mortar wrapping layer around the coarse aggregate to block the water seepage pores along the surface of the coarse aggregate. Improve aggregate particle gradation and reduce concrete porosity.

The amount of cement for waterproof concrete shall not be less than 320kg m3, and when mixed with active admixture, the amount of cement shall not be less than 280kg m3 of the bridge; (2) Mixed with chemical admixtures to improve compactness Mixing an appropriate amount of superplasticizer, triethanolamine early strength agent or ferric chloride waterproofing agent into concrete can improve compactness and increase impermeability. The superplasticizer can not only reduce the water consumption of concrete, but also fully disperse the water, accelerate the hydration, and increase the hydration products; Triethanol is a catalyst for cement hydration reaction, which can increase cement hydration products; Ferric chloride waterproofing agent can be combined with Ca(OH) in cement hydration products to form water-insoluble colloids and fill pores, so as to prepare high-density, high-impermeability waterproof concrete.

3) Use expanded cement (or mixed with expansion agent) to improve the compactness of concrete and improve impermeability.

Summary. Dear, I'm glad to answer for you: What are the pore characteristics in materials? What is the difference between bulk density and apparent density of a material? A: Hello, dear! <>

According to the characteristics of pores, the porosity of the material can be divided into open pores and closed pores, and the sum of the porosity of the two is equal to the total porosity of the material. The characteristics of porosity are generally divided into two aspects: porosity and porosity.

In general, the greater the porosity, the same density of the material (because the density of the material is measured in a dense condition), the smaller the apparent density, the lower the strength, and only a few quantities can be determined without knowing the pore characteristics. The pore characteristics are: open and closed pores, connected pores and closed pores.

Water absorption: the larger the porosity, the more open pores at the same time, the more connected pores, the better the water absorption; If all of them are closed and inconnected, the porosity has no effect on water absorption. Frost resistance:

Contrary to water absorption, the better the water absorption, the worse the frost resistance. Impermeability: Consistent with water absorption, at the same time, the connectivity of the pores has a special effect on it, which is its main influence on thermal conductivity

The porosity is constant, the fewer the connected pores, the worse the thermal conductivity, and it does not matter whether the porosity is open or not; If the pore characteristics remain the same, the porosity will generally be larger. Thank you for your patience. The above is my full reply, if you are satisfied with my service, please give a thumbs up, and I wish you all the best!

Peace and joy! What are the pore characteristics in a material? What is the difference between bulk density and apparent density of a material?

What are the pore characteristics in a material? What is the difference between bulk density and apparent density of a material?

Dear, I'm glad to answer for you: What are the pore characteristics in materials? What is the difference between bulk density and apparent density of material Changkai? A: Hello, dear! [Happy and patient] <>

According to the characteristics of pores, the porosity of the material can be divided into open pores and closed pores, and the sum of the porosity of the two is equal to the total porosity of the material. The characteristics of porosity are generally divided into two aspects: porosity and porosity.

In general, the greater the porosity, the same density of the material (because the density of the material is measured in a dense condition), the smaller the apparent density, the lower the strength, and only a few quantities can be determined without knowing the pore characteristics. The pore characteristics are: open and closed pores, connected pores and closed pores.

Water absorption: the larger the porosity, the more open pores at the same time, the more connected pores, the better the water absorption; If all of them are closed and inconnected, the porosity has no effect on water absorption. Frost resistance:

Contrary to water absorption, the better the water absorption, the worse the frost resistance. Impermeability: Consistent with water absorption, at the same time, the connectivity of the pores has a special effect on it, which is its main influence on thermal conductivity

The porosity is certain, the fewer the connected pores, the worse the thermal conductivity, and the opening of the pores does not matter; If the pore characteristics remain the same, the porosity will generally be larger. Thank you for your patience. The above is my full reply, if you are satisfied with my service, please give a thumbs up, and I wish you all the best!

Peace and joy!

First of all, do you ask for "porosity" or "porosity"? Although a word difference, these are two very different concepts.

First of all, "porosity", porosity: refers to the percentage of the ratio of the pore volume in the material to the volume of the material in the natural state, which is the structural characteristics of the material itself.

Speaking of "porosity", porosity is the percentage ratio of the volume of voids in the "bulk material" in the "natural accumulation" state to the volume of the bulk material in the natural state. If we talk about stones, it is the ratio of the volume of the void in the middle to the total volume of the natural state after the accumulation of many stones.

Going back to the question you said, according to the conditions you give, you can only find the porosity [porosity = 1 - (bulk density apparent density)], but not the porosity. To request porosity, you also need to know the absolute density of the material, porosity = 1- (apparent density absolute density).

Hope it helps.

In this way, only the void ratio can be found.

Porosity = 1- (bulk density apparent density).

Porosity = 1- (apparent density Absolute density).

[(bulk density x volume) - (apparent density x volume)] volume x 100%.

1. The brick density = 50 should be.

2. The brick is superficially dense and rough.

3. Absorption rate of clean water = 100%.

4. Porosity.

1- Apparent density density) 100%.

5. By mass water absorption volume water absorption = water density and apparent density of the material.

Volumetric water absorption = (apparent density of material * mass water absorption) Density of water.

6. The opening porosity is equal to the volume water absorption.

7. Closed hole stool coarse porosity = porosity - open porosity.

Summary. Apparent density other encyclopedia entries.

The ratio of material mass to apparent volume.

Apparent density refers to the ratio of the mass of a material to its apparent volume [1], which is the volume of solids plus the volume of closed pores. Generally, the volume is measured directly, and for materials with irregular shapes, the pores can be closed by the wax sealing method, and then the volume is measured by the liquid discharge method.

In general, the apparent density refers to the apparent density of the material in a dry state, apparent density = m (solid) v (solid + closed pores). The apparent density of the material can be measured using the drain method.

When calculating the apparent density, why should the air in the opening void also be calculated?

The apparent density refers to the ratio of the mass of the material to the apparent volume [1], and the apparent volume is the volume of the hidden segment of the entity plus the volume of the closed pores. Generally, the volume is measured directly, and for materials with irregular shapes, the pores can be closed by the wax sealing method, and then the volume of the body foci can be measured by the liquid discharge method. In general, the apparent density refers to the apparent density of the material in a dry state, apparent density = m (solid) v (solid + closed pores).

The apparent density of the material can be measured using the drain method.

For regularly shaped materials, the volume is measured directly; For irregularly shaped materials, the pores can be closed by wax sealing, and then the volume can be measured by the drain method; For the sand balance rock aggregate used in concrete, the volume is directly measured by the liquid discharge method, and the volume at this time is the sum of the solid volume and the closed pore volume, that is, the open pore body that is connected with the outside world is not included. Because the sand and gravel are relatively dense, there are few pores, and the open pore volume slag is less than the oak block, so the density measured by the liquid discharge method is also called the apparent density, which was also called the apparent density in the past. When calculating the apparent density, if only the internal pores of the material are included and not the moisture in the pores, it is called the dry apparent density; If it includes both the internal pores of the material and the moisture within the pores, it is called wet apparent density.

In general, apparent density refers to the apparent density of a material in its dry state. Most materials are porous, with open pores and closed pores that communicate with the outside, and the density of the material containing closed cells is called "apparent density".

Hope mine is helpful to you<>

Summary. There is a certain relationship between the apparent density of crushed stone and the porosity. In general, when the apparent density of crushed stone increases, the porosity decreases; When the apparent density of crushed stone decreases, the porosity increases.

This is because, when the apparent density of crushed stone increases, the rock particles in the material will become denser, thus reducing the pore space in the material; When the apparent density of crushed stone decreases, the rock particles in the material will become more loose, thus increasing the pore space in the material.

There is a certain relationship between the apparent density of crushed stone and the porosity. In general, when the apparent density of crushed stone increases, the porosity decreases; When the apparent density of crushed stone decreases, the porosity increases. This is because, when the apparent density of crushed stone increases, the rock particles in the material will become denser, thus reducing the pore space in the material; When the apparent density of crushed stone decreases, the rock particles in the material will become more loose, thus increasing the pore space in the material.

Specifically, when the rock particles in the material become denser, they cannot be separated too easily due to the interaction forces between the individual particles, thus reducing the pore space in the material. When the rock particles in the material become more loose, they can be separated relatively easily because there is not much interaction between the individual particles, thus increasing the pore space in the material. In addition, it is also important to note that different rock particles will also have different apparent densities.

For example, the apparent density of some large particles will be higher than that of some small particles. Therefore, it is essential to pay attention to this factor when measuring or calculating apparent density. In conclusion, we can see that there is a certain relationship between the apparent density of crushed stone and the porosity.

When the rock particles in the material become denser, the pore space in the material decreases; And when the rock particles in the material become more loose, the pore space in the material increases.