Is it okay to use small granular pebble aggregate for the concrete of the main column of the house f

Yes, but the particles should not be too small, after all, it is the load-bearing main column, and safety first.

Pebbles can not, the pebble surface slip affects the ash to reduce the seismic capacity, and small particles are not OK, and the main column is at least 1 to 3.

The concrete of the main column of the self-use house can be used with small pebble aggregates, because the bearing capacity of the self-use house is not so high, so it can be used.

The stone is unqualified and must be reversed.

Hello, concrete can be made of small granular pebble aggregate.

Since it is a self-use house, it cannot be improvised, cheap, material-saving, and not according to the construction standards to beat the concrete.

As the main column, it must have load-bearing, seismic and other requirements, and the stone inside is also very particular.

The stone used for the main column should be preferred, that is, egg-sized pebbles, such as the concrete structure and strength. The stone is too large for the woven steel bars to hold, and it is also easy to produce cavitation; The stone is too small, and its strength is reduced, which is no different from ordinary cement mortar.

Distinction of stones: the bowl is so big, it is called rubble, which is suitable for cushioning; Two or four stones, the size of an egg or goose egg, are best suited for extensive concrete pouring; Zero five stones, the size of a quail egg, used to pour a small area of load-bearing platforms; Bean grain stone, broad bean-sized and uniform crushed stone, suitable for terrazzo flooring.

The house you live in must be built strong, especially the earthquake-resistant columns, don't save, although two or four stones are slightly more expensive!

Is it okay to cook laterite in a self-use room and use small granular pebble aggregates? Yes, as long as you have enough cement, the sand will be well matched, and you will be able to do it in the future.

Pebbles can be used in concrete, but they are not recommended.

Although the pebble rock has high strength, the surface is smooth, the shape is round, and the internal friction angle is small after combining with the cement stone. The final performance is that the compressive and tensile strength of concrete is significantly lower than that of concrete with artificial gravel.

In the early days, that is, before the implementation of the design code for ordinary concrete mix JGJ 55-2011, pebbles were encouraged to be used for pile foundation concrete, because the pile foundation was mainly compressed, and was constrained by the transverse, the stress condition was single, and the pebbles could be used in the case of the same ratio, to obtain better slump and fluidity, which was suitable in the case that admixtures, admixtures, etc. were not popularized at that time, but with the progress of technology, the new regulations are no longer advocated. Even with artificial crushed stone, good flowability and workability can now be obtained, and small segregation is guaranteed.

The first question is whether pebbles are allowed to be used as concrete mixtures in concrete.

A: No, you can't!

The place where the pebbles are produced is basically based on it, and the hourglass does not know what it is.

The main chemical component of pebbles is silica, followed by a small amount of iron oxide and trace amounts of manganese, copper, aluminum, magnesium and other elements and compounds. They themselves have different pigments, such as red for iron, blue for copper, purple for manganese, yellow translucent for silica colloidal chalcedony, jade color with green minerals and so on; Due to the different types and contents of these pigment ions dissolved in silica hydrothermal fluids, they show a variety of colors such as shades and shades, making the pebbles appear black, white, yellow, red, dark green, blue and gray.

Pebbles cannot be used in concrete. In concrete structure, stone is aggregate, sand is fine aggregate, and cement is cementitious material. Cement and sand form a filler, which fills the pores between the stones and the stones, and the filler actually wraps the stones and forms a whole with the stones after solidification.

The shape of the pebble is relatively smooth and streamlined, the gravel is an irregular polygonal shape, in the internal mechanics, the friction of the pebble and the sand and ash is much smaller than the friction of the gravel and the sand and ash, of course, the strength is not as good as the gravel. In addition, the strength of the concrete may be reduced after the addition of pebbles, because the surface of the pebbles is too light, and the bonding properties are worse than that of crushed stone.

There is already an empirical formula for the mix ratio of pebble concrete. There's nothing that can't be used. As long as the gradation and strength of the pebbles and other indicators are qualified. Pebble concrete is still advantageous for pumping because the stone does not have needle flakes.

I haven't heard of the norm for site restriction pebbles. The aggregate particle size is limited according to the rebar spacing at most.

Smooth surfaces have no friction and cannot be used directly on concrete, and something big will happen" is wrong.

There is no scientific basis, take it for granted. In the past, pebbles were generally used, but now because of long-term development, smaller pebbles have fewer particle sizes, and crushed pebbles are used.

It must be broken to a small enough size to be used, and the smooth surface has no friction and cannot be used directly on concrete, which will cause big problems.

If the stress column of the high-rise part of the high-rise building is poured with pebble concrete, it does not meet the requirements, and it has an impact on the house, and it is reinforced. If it is a stressed column of the non-high-rise part, it has little impact on the high-rise part, but it should be identified and tested, and reviewed. If there is a problem, it should be reinforced.

Generally, the concrete strength of high-rise buildings is high, and the concrete strength grade should be above C30. Small high-rise buildings can be used above C25, and if it is C25 concrete, concrete can be poured with pebbles with higher strength.

This has nothing to do with what kind of stone is mixed with business, as long as the construction site does not have design requirements for crushed stone, the commercial mix as long as the design strength and relative durability requirements can be guaranteed, and the different varieties of stone used in concrete are different in the amount of other raw materials used in the mix design, and you don't need to worry about the use.

Since I entered the School of Architecture a few decades ago and knew that concrete, the "coarse aggregate" in the composition of concrete has always been two kinds: gravel and pebbles (that is, the oval stones of pebbles that the landlord said). As long as the quality is qualified, the grade is matched, and the strength is also achieved, and the design bearing capacity and durability requirements are met.

At that time, the yield of natural pebbles in the river could be used for construction, easy to obtain, and cheap. The times have changed, prohibiting the indiscriminate mining of pebbles in the river, and its output is far from meeting the requirements of the construction of civil engineering, and the mining and production of gravel, the supply is broad, and now, it has become a rare occurrence to see very few pebbles mixed concrete in the city!

There are many reasons for the damage shown by the landlord**, but it cannot be blamed on pebbles.

The coarse aggregate in the cement concrete mixture should be magmatic rock or unweathered sedimentary rock.

The surface of pebbles is smooth, and the friction with other materials is small, which will cause the concrete to be very loose, so pebbles should not be used.

For concrete below C50, pebbles can be used as aggregate in concrete.

You can also. The selection should be checked to determine the sand rate.

Both pebbles and crushed stone can be used as aggregates for concrete. Pebbles are formed due to the action of water flow erosion, natural weathering, etc., with no edges and corners in appearance, smooth surface, and have the advantages of small surface area (compared with gravel), wide supply and large output. Among them, the surface of mountain pebbles is rough, often mixed with soil and organic matter; The river pebbles have been washed by water for a long time, and the surface is smooth and clean, and there are few impurities.

Therefore, river pebbles can increase the workability of concrete, and mountain pebbles can increase the adhesion of pebbles to cement. The internal friction of pebble concrete, easy flow, can increase the compactness of concrete. In addition, the general pebbles can be screened directly from the mountains or rivers, without the need for additional processing, and have a suitable natural gradation, the cost is low.

Crushed stone is obtained by crushing hard rock by machinery or artificiality, and the processing cost is higher than that of pebbles. The advantage of crushed stone is that it has water chestnut, toothing, and strong adhesion to cement with rough surface, so when the mix ratio is the same, the concrete strength is higher than that of pebbles. However, the workability of concrete is poor, and it is difficult to vibrate.

Therefore, pebbles are mostly selected in the project, which is comprehensively considered from the aspects of material performance, pouring process, supply and cost.

In fact, the vast majority of domestic concrete is made of crushed stone instead of pebbles. What you see may be an isolated phenomenon. Concrete with crushed stone works better than concrete with pebbles.

Anywhere! For example, there is pebble concrete in Beijing, of course, it must be tested to confirm the appropriate ratio! (It is certain to use more cement, and it is impossible to do a high strength grade) only use this kind of concrete in special areas.

A secondary part of the general building.

Crushed stone and pebbles are used as coarse aggregates in concrete and act as skeletons.

Crushed stone is obtained by crushing and sieving natural rocks (or pebbles). It is angular, rough on the surface, and has good adhesion with cement.

Pebbles are mostly round, with a smooth surface and poor adhesion to cement.

When the same concrete mix ratio is used, the concrete mixed with pebbles has better fluidity but lower strength after hardening, while the concrete mixed with crushed stone has poor fluidity but higher strength after hardening.

The selection of crushed stone or pebbles for the preparation of concrete should be comprehensively considered according to the nature of the project, the best situation of local materials, and the cost.

It depends on what kind of rock you have there is used to break it, how hard it is, if the hardness is the same as that of pebbles, it is better to crushed stone, because it has sharp corners. It can be cemented better with cement.