gravel 20 40 Specific gravity
How much gravel weight of 20 to 40, rubble 20-40 weight? See Table 1 in response.
Note: Practice has shown that the most commonly used fractions of crushed stone, as the proportion of visitors who want to learn - this gravel 0-5 mm, 0-10 mm, 0-40 mm, 20-40 mm, 40-70 mm, 5- 20 mm, 10-20 mm, 5-10 mm, 25-60 mm, 20-70 mm, 10-15 mm, 20-60 mm, 25-60 mm and 10-120 mm, 80-120 mm.
Table 1. How much gravel weight of 20 to 40, the weight of rubble 20-40. .
Granodiorite, granodiorite from.
Hornblendite from hornblendite.
Porphyry, of porphyry.
Lime, limestone, limestone, limestone.
The question of which of gravel weight of 20 to 40 mm, quite common among visitors to our site of building subjects. Where 20 40 - a fraction or size in mm particulate grains, stones (pebbles) constituting the structure of particulate stone material. In the production method of crushing rubble, crushing the special equipment, the source rock or artificially prepared substance is broken up into fine grains with a sufficiently accurately defined size. The larger and smaller fractions mandatory, on technological requirements removed, eliminated as an impurity in the form of sand, dust, and clay. A material according to GOST gravel fr 20 40, to go on sale from producer homogeneous and pure. Have certain characteristics to GOST gravel fraction 20-40 mm. One of the important characteristics arising from manufacturing technology fr gravel 20 to 40 mm, a weight or mass of gravel. In practice, we operate most of these characteristics gravel 20-40 mm as specific gravity, bulk density of 1 m3, cube, cubic meter, cubic meter. What are these "refinements"?
At first glance, the weight - it is very simple characteristics, self-explanatory. This is not quite true. Gravel 20 to 40 mm, as well as all other bulk materials, has some characteristics associated with "problem" to determine its density. For bulk materials, there are two main types of density: the true and bulk. Thus, the bulk density of gravel fraction 20-40 mm, taking into account the mineralogical, physical density material together with a quantity of air contained in the volume of particulate substance and the bulk density determines the 1 m3 cube cubic meter, cubic meter. Therefore, in practice, we are in terms of specific gravity and bulk density of gravel, that is, the amount of bulk material per unit volume of the substance. For comparison, the true weight of gravel fr 20-40 mm, excludes from consideration of the amount of air in the bulk material takes into account only the weight (more density) of solid grain fraction of 20 to 40 mm.
Why the need for gravel fraction 20-40 mm? This is due to the fact that the use of gravel this fraction turned out the best way to use bulk material when performing a wide variety of construction and road works, for the manufacture of concrete structures, concrete preparation, dumping tracks, blind area, construction of the foundations of houses, garages, country cottages, private houses, fences, setting posts, gates, gates, sheds, drainage, manufacturing asphalt mixtures for the construction of the well, paving slabs, even in the planning of parking lots. As we see the range of tasks for which the rubble fraction is used 20 to 40 mm - very large. In connection with the implementation of construction and road works, you may have a purely applied issues such as: how much weight a bucket of gravel fractions of 20 to 40 mm, or how much weight of 1 liter of rubble fr 20-40 mm. The answer can be found in Table 1: a bucket of gravel weight of 20 to 40 mm and a weight of 1 liter of crushed stone 20-40 mm.
Weight 1m3 rubble 20-40
Rubble is an auxiliary building material, and is characterized by a fairly frequent use in different situations. The specific direction of application of gravel depends on its origin, fractions and some other parameters.
Crushed granite middle fraction
The most widely spread rubble of granite middle fraction having a particle size of 20-40 mm. This is due to the following factors:
- Material origin gravel (granite) characterized by durability, resistance to adverse environmental factors and resistance to high loads.
- Fraction 20-40 mm combines the advantages of a small fraction of gravel and coarse.
- The cost of this type of material is also a pretty average.
The above allows the use of this type of gravel in the production of concrete and concrete products in the preparation of pillows for road construction or under foundation.
Since gravel relates to particulate materials, typically, its measurement is made in the volume taken, i.e. in cubic meters. In some cases, we may want more or less know exactly gravel weight:
- During transportation;
- When planning the final weight of concrete products;
- When calculating the loads on the ground and other structures provided from gravel pad.
rubble weight depends on various factors:
Since granite rubble of the middle fraction is the most popular, it and take a closer look.
The determining factor is the weight of the material origin. For example, a cubic meter of crushed stone tuff (porous, lightweight material) will weigh about 800 kg, and the same cubic meter of crushed rock sandstone - 1.3 tons. If we consider we are interested in granite rubble 20-40, 1m3 weight will be about 1400 - 1500 kg.
In other words, the denser the starting material, the harder it will be rubble.
The next important factor - size fractions. The smaller, the smaller the voids between the particles. Thus, gravel fills the volume, and a cubic meter of fine gravel will weigh more than a cubic meter larger, but to a certain limit. If fraction refers to a large, the voids between the particles are compensated by weight of the particles themselves, and gravel total weight per cubic meter rising again.
We are considering the fraction 20-40 mm is the average, and that its weight per cubic meter will be minimal. To it crushed granite is approximately 1400 - 1410 kg.
Flakiness particles less effect on weight, but still noticeable. The number of voids in the rubble with high flakiness is more than the rubble with low. Accordingly, the weight will be less than average.
Similarly, a high coefficient of water absorption increases rubble weight by the addition thereto of weight absorbed water.
Please note that these figures are averages. If you care to know the exact weight of crushed stone used, it is necessary to resort to a special procedure for weighing loose bodies, which allows you to determine the weight adjusted for all possible factors.
Crushed rock produced by crushing rocks, followed by sieving. Such crushed stone - an important element of the construction. The quality of any concrete produced depending on the specifications used rubble. Its main indicator is the proportion that defines the ratio of the mass of raw material to the filled in volume.
This parameter is taken into account when calculating the amount of material used in construction. Also determined bulk density - weight in a natural uncompressed condition. It is characterized as the volume of the individual rubble stones and the space between them and is used in calculating the composition of the concrete mixture. The more air, the lower the density. Having a rough surface, rubble very tightly engaged with the cement mortar and sand, forming a monolithic structure. Due to this measure the small size stone is an excellent filler.
Specific gravity (SG) is dependent on the density and fractions. The larger the stone, the stronger will be the solution. In the production of concrete required fractions of different shapes and sizes because the purpose of building mixtures may be different: the production of concrete products and slabs, foundations apparatus for buildings and structures, three-dimensional structures. When mixing the solution you need to know that the higher the bulk density, the lower the consumption of cement.
In addition, broken by weight depending on the storage conditions. Each species has its porosity and water absorption so that if the pores in the rock is small, the less water it absorbs and hence less susceptible to loss. HC value should be taken into account when transporting building material. Knowing the volume and the specific weight of the rubble is possible to calculate the number of required transport and its capacity.
The characteristics and performance of limestone gravel
The most expensive and the quality is considered gravel obtained from sawmills, which is composed of calcium carbonate, and various impurities reduce its hardness. Having high resistance to thermal shock and having sufficient strength and frost resistance, it is environmentally friendly material. If the percentage of members of the impurities is relatively small, the color of the rubble will be red, yellow or brown.
Flakiness gravel (presence of lamellar and acicular forms) not more than 10-15%, which is a good measure of its performance. This means that the mixture is very collapsed voids, so the amount of binder used will be considerably less.
Determining the proportion of limestone rubble need to know what is the mass of 1 m3 of volume. This parameter takes into account the density of solid grains and the air, which is contained in the composition. GOST 8267-93 "Crushed stone and gravel of solid rocks for construction works" regulates the basic characteristics of this type of gravel:
Limestone gravel produced in three fractions:
- Fraction 5-20 mm - fine grind is used in the production of lime, small reinforced concrete structures, roadway with low bandwidth, construction mixtures, cladding of buildings;
- 20-40 mm - secondary crushing, is used more often than other fractions. I found application in the Gulf foundation manufacture w / w product, roads with heavy traffic flow;
- 40-70 mm - large fraction is used very rarely. The ballast layer and the gravel bed is the main area of use.
The most popular is considered to be a fraction of 20-40 mm, which is a very good filler and binder. His performance hardiness and durability make it possible to operate in any climate.
Main characteristics and properties of crushed granite
This gravel is very durable and is often used building material. It is obtained by crushing rocks. He is given an assessment of the quality of its fractions, larger than it is, the cheaper the very gravel. An important characteristic is the proportion of crushed granite. To make preliminary estimates of the amount of material required for production, the weight of the gravel is better to take in the dry state, it is also called bulk density. Mean weight is cubic meter of crushed rock, is 1.6 tons.
The presence of the needle and the flat particles reduces compaction density, which leads to lower hardness of road surfaces or concrete structures. Therefore, the lower the flakiness, the higher the quality of the material, the smaller the flow of cement or other binder component. This type of gravel it is 5-23%, depending on the size fractions.
- Fraction 5-20 mm - the hottest look and the high price. Used in the manufacture of industrial concrete road surfaces and areas of clusters.
- 20-40 mm - ideal for building roads, construction of embankments for railways, tramways, in the manufacture of reinforced concrete, the construction of buildings and structures for various purposes.
- Crushed fraction 40-70 mm - gravel commonly used with low price. It is used as an intermediate product for production of crushed stone with a smaller staff.
Table I shows data SW (t / m3) of the two main types of gravel into fractions:
Dolomite, as well as the granite has a high strength, frost resistance and a low degree of moisture absorption. In calculating the proportion should be remembered that under this characteristic it is meant the bulk density or weight of 1 m3.
Because of the low radioactivity, it is used not only for pouring the foundation and other external works, but also for interior decoration of buildings, lime production and landscape design. Contained in dolomite gravel various impurities attached gravel different colors, which is particularly appreciated during cladding operations. It is resistant to thermal shock, impact resistant and environmentally friendly. density ratio is lower than that of granite and its consumption by using less. Rough edges and enhanced binding properties, increase the adhesion of pebbles. Composition size in mm: 5-10; 10-20; 20-40; 40-70. The average fraction of dolomite has high, so it is often used for the production of asphalt and improve the quality of concrete.
Crushing rocks prepared gravel, which is used for kneading concrete.
Technology of preparation of black gravel to reduce water absorption of crushed rocks.
The construction for the manufacture of concrete, road works used.
What better foam or aerated concrete?
Application of DSP in construction