The relationship between concrete slump and fineness modulus

There is no direct relationship. Slump.

Reflect: 1. Workability of concrete (mixing time); 2. The moisture content of concrete.

3. Gradation of coarse and fine aggregates (organic combination of sand ratio and stone particle size). Fineness modulus.

It is simply an indication of the average particle size of the fine aggregate.

Slump mainly refers to the plasticizing performance and pumpable performance of concrete, which is a quantitative index to measure its degree (plasticization and pumpability) to judge whether the construction can be carried out normally. Affects concrete slump.

There are mainly gradation changes, water content, weighing deviations of the horizontal device, and the amount of admixtures is easy to be ignored, as well as the temperature of cement. Slump refers to the workability of concrete, specifically to ensure the normal progress of construction, including the water retention, fluidity and cohesion of concrete. According to the different slumps, the concrete mixture can be divided into large fluidity concrete (slump 150mm), fluidity concrete (slump 100 150mm), plastic concrete (slump 50 90), low plastic concrete (slump 10 40mm).

The slump is the reflection of the flow of concrete mixture, and the fineness modulus is the reflection of the thickness of the sand, and there is no direct connection between the two, from the indirect connection: under the same conditions of other parameters, the sand fineness modulus is large, indicating that the sand is coarse, the specific surface area is small, the water demand is less, the slump has a certain increase, and on the contrary, there is a certain decrease, but the change is not very obvious, unless the fineness modulus is very different. For example, the difference with.

The slump characterizes the workability of the concrete, and the fineness modulus characterizes the thickness of the sand, and the two have nothing to do with each other.

The relationship between concrete slump and fineness modulus is inversely proportional.

Slump. It's not calculated, it's experimental.

Slump test method: use a flare with an upper mouth of 100mm, a lower mouth of 200mm, and a height of 300mm.

Barrel, after pouring into the concrete, tamping, and then vertically up the barrel, the process of pulling up must not touch the concrete so as not to affect the measurement data, the concrete due to its own weight to produce the phenomenon of collapse, with the height of the barrel (300mm) minus the height of the highest point of the concrete after the collapse, called the degree of collapse. If the difference is 10mm, the slump is 10.

The slump of concrete should be determined according to the structural section of the building, the content of reinforcement, the transportation distance, the pouring method, the mode of transportation, the cracking capacity and the climate, etc., and should be comprehensively considered when selecting the ratio of the coarse source, and it is advisable to use a smaller rock slump.

The slump is suitable for concrete mixtures with high fluidity (slump value is not less than 10mm), and when the slump of dry and hard concrete mixtures is less than 10mm, its consistency must be expressed by viber consistency (s).

Dear, hello: the consistency and slump of concrete section stove: 1, slump:

Methods and indicators for the determination of workability of concrete, in the construction site and in the laboratory: It is usually done to do a slump test to determine the fluidity of the mixture; It is supplemented by intuitive empirical assessment of cohesion and water retention. 2. Concrete slump:

The workability of coagulation. Specifically, it is to ensure the normal progress of the construction, including the water retention, fluidity and cohesion of the concrete. Thank you for your consultation, I hope this service can help you, you can click on my avatar to follow me, hold and guess the follow-up problems Zhao Nian convenient to consult me again, and finally wish you a happy life!

The slump range of each grade of concrete is as follows:

1. When the concrete strength grade is less than C50, the slump should be less than 180 mm.

2. When the strength grade is greater than C50, the slump should be greater than 180 mm.

Slump refers to the workability of concrete, specifically to ensure the normal progress of construction, including the water retention, fluidity and cohesion of concrete. Slump is a quantitative indicator to measure the degree of slump, which is used to judge whether the construction can be carried out normally. When the specified concrete slump is less than 40 mm, the allowable deviation is 10 mm.

When the specified concrete slump is 50 90 mm, the allowable deviation is 20 mm; When the specified concrete slump is greater than 100 mm, the allowable deviation is 30 mm.

The slump and slump expansion test should be carried out according to the following steps.

1. Moisten the slump cylinder and bottom plate, and there should be no open water on the inner wall of the slump cylinder and the bottom plate. The bottom plate should be placed on a solid horizontal surface, and put the cylinder in the center of the bottom plate, and then step on the foot pedal on both sides with the foot, and the slump cylinder should keep a fixed position when charging.

2. The concrete samples obtained according to the requirements are evenly loaded into the cylinder in three layers with a small shovel, so that the height of each layer is about one-third of the height of the cylinder after tamping. Each layer is pounded 25 times with a tamper. Insertion should be carried out along the spiral direction from the outside to the center, and each insertion should be evenly distributed on the cross-section.

When inserting the concrete on the edge of the cylinder, the tamper can be slightly tilted. When inserting the bottom layer, the tamper should run through the whole depth, and when the second layer and the top layer are inserted, the tamper should penetrate the surface of this layer to the next layer; When pouring the top layer, the concrete should be poured high above the cylinder opening. If the concrete settles below the cylinder mouth in the process of tampering, it should be added at any time.

After the top layer is inserted, scrape off the excess concrete and smooth it with a spatula.

3, after removing the concrete on the bottom plate of the cylinder side, lift the slump cylinder vertically and smoothly, and the lifting process of the slump cylinder should be completed within 5-10 seconds. The entire process from the start of the charge to the lifting of the slump cylinder should be carried out without interruption and should be completed within 150 seconds.

4, the height difference between measuring cylinder height and the highest point of concrete test body after slump after lifting slump cylinder, is the slump value of this concrete mixture; After the slump cylinder is lifted, if the concrete collapses or one side shears phenomenon, then should be re-sampled and measured separately; If the above phenomenon still occurs in the second test, it means that the workability of this concrete is not good, and it should be recorded for future reference. 5. Observe the cohesion and water retention of the concrete test body after collapse. The method of checking the cohesion is to gently tap the side of the concrete cone that has collapsed with a pound, and if the cone gradually sinks at this time, it means that the cohesion is good.

If the cone collapses and partially cracks or segregation, it indicates that the cohesion is not good. Water retention is evaluated by the degree of slurry precipitation of concrete mixture, if there is more slurry precipitation from the bottom after slump cylinder is lifted, and the concrete of cone part is also exposed because of slurry loss, then indicates that the water retention performance of concrete mixture in this old section is not good. If there is no slurry or only a small amount of slurry precipitates from the bottom after the slump cylinder is lifted, it means that the concrete mixture has good water retention.

6, when the slump of concrete mixture is greater than 220mm, measure the final maximum diameter and minimum diameter of concrete after expansion with a steel ruler, use its arithmetic mean value as slump expansion value under the condition that the difference between these two diameters is less than 50mm, otherwise this test is invalid. If it is found that the coarse aggregate has cement slurry precipitation at the edge of the pile, it means that the segregation resistance of this concrete mixture is not good, and it should be recorded.

Slump refers to a measure of the workability of concrete. Workability refers to whether the concrete is easy to construct and operate, and the performance of uniform compacting. The effects and workability mainly include water consumption, water-cement ratio, sand rate, including cement variety, aggregate conditions, time and temperature, admixtures and other aspects.

Test method of slump: use a 100mm upper mouth, 200mm lower mouth, 300mm high trumpet-shaped collapse bucket, pour into the concrete and then tamp it, and then pull up the bucket vertically, the concrete shall not be touched during the pulling process so as not to affect the measurement data, the concrete collapses due to its own weight, and the height of the barrel (300mm) is used to subtract the height of the highest point of the concrete after the collapse, which is called the collapse. If the difference is 10mm, the slump is 10.

The slump test is mainly done on site to control the quality of concrete, and to control the state of construction concrete to achieve the state of laboratory mix ratio. The specific standard of slump depends on the drawing design standard and the laboratory mix ratio standard, due to the different construction parts, the required concrete state is also different.

The requirements for concrete slump in the code are:

1. When the concrete strength grade is less than C50, the slump should be less than 180 mm, and when the strength grade is greater than C50, the slump should be greater than 180 mm;

2. When the specified concrete slump is less than 40 mm, the allowable deviation is 10 mm; When the specified concrete slump is 50 90 mm, the allowable deviation is 20 mm; When the specified concrete slump is greater than 100 mm, the allowable deviation is 30 mm.

3. The sampling frequency of concrete slump test should be consistent with the sampling frequency of concrete strength test.

Summary. Hello, Glad to serve you 1Slump:

It mainly refers to the plasticizing performance and pumpable performance of concrete, which is a quantitative index to measure its degree (plasticization and pumpability) to judge whether the construction can be carried out normally. The strength grade of concrete refers to the compressive strength of the concrete. The strength grade of concrete should be divided by the standard value of the compressive strength of the concrete cube.

The symbol c is used with the standard value of the compressive strength of the cube (in n mm 2; or MPA meter). 2.The collapse is too large, the concrete segregation and the water-glue ratio are larger, which has an impact on the structure. If the collapse is too small, the workability of the concrete is not good, the fluidity is poor, and it is difficult to pump.

Moreover, it is not easy to be compacted when vibrating, and the structure is prone to quality defects such as rotten roots and dog holes. 3.In general, it has no direct impact on the strength, it mainly affects the initial and final setting time of concrete, as well as the control of concrete vibration in operation.

Hello, Glad to serve you 1Slump mainly refers to the plasticizing performance and pumpable performance of concrete, which is a quantitative index to measure its degree (plasticization and pumpability) to judge whether the construction can be carried out normally.

The strong group resolution grade of concrete refers to the compressive strength of concrete. The strength grade of concrete should be divided by the standard value of the compressive strength of the concrete cube. The symbol c is used with the standard value of the compressive strength of the cube (N mm 2; or MPA meter).

2.If the collapse is too large, the concrete segregation and the water-glue ratio will be larger, which will have an impact on the structure of the bridge or contingent; If the collapse is too small, the workability of the concrete is not good, the fluidity is poor, and it is difficult to pump. Moreover, it is not easy to be compacted when vibrating, and the structure is prone to quality defects such as rotten roots and dog holes.

3.In general, it has no direct impact on the strength, it mainly affects the initial and final setting time of concrete, as well as the control of concrete vibration in operation.

What about the relationship between weight and slump?

Get to the point.

It has nothing to do with bulk density, the actual slump is related to the sand rate, water-cement ratio and the ultra-inferior diameter of the mixture.