A method for preventing the floating of rubber aggregates during the construction of plastic rubber concrete and its application

Abstract

This invention belongs to the field of engineering construction and provides a technology to avoid the floating and uneven distribution of rubber aggregates during the construction of rubber concrete. The invention involves a secondary mixing process for cement slurry-coated "rubber aggregates" based on the interfacial mechanism of concrete. First, cement slurry and rubber aggregates are repeatedly mixed to create cement slurry-coated "rubber aggregates" with a higher density than the original rubber aggregates. Then, sand, gravel, clay, bentonite, etc., are added for secondary mixing, achieving uniform distribution of the rubber aggregates within the concrete and preventing them from floating.

Description

Technical Field

[0001] This invention belongs to the field of engineering construction, and in particular relates to a technology and engineering application for preventing the floating and uneven distribution of rubber aggregates in rubber concrete. Background Technology

[0002] Rubber concrete is a recently developed type of concrete, possessing typical toughness and ductility characteristics, and represents the future direction of modern concrete development. However, because the density of rubber aggregates is lower than that of other components in concrete, the rubber aggregates tend to float during construction, causing unevenness within the concrete and affecting its performance, thus limiting its large-scale application in practical engineering. Currently, there are no successful experiences in the construction technology of plastic rubber concrete available for reference, either domestically or internationally. Summary of the Invention

[0003] The purpose of this invention is to provide a technology to avoid the floating and uneven distribution of rubber aggregates during the construction of rubber concrete. Based on the interfacial mechanism of concrete, a secondary mixing process of cement slurry-coated "rubber aggregates" was developed. First, cement slurry and rubber aggregates are mixed multiple times to generate cement slurry-coated "rubber aggregates," which have a higher density than the original rubber aggregates. Then, sand, gravel, clay, bentonite, etc., are added for secondary mixing, achieving uniform distribution of the rubber aggregates within the concrete and preventing them from floating. The specific steps are as follows:

[0004] 1. Weigh the raw materials according to the rubber concrete mix proportion. The raw materials include cement, sand, crushed stone, water, rubber powder, bentonite, and clay; Cement: Sand: Crushed stone: Water: Rubber powder: Bentonite: Clay = 4-6%: 30-35%: 30-35%: 12-13%: 0.5-1.5%: 2-3%: 6-8% 2. Add cement to the cement mixing tank, then add 1 / 3 to 1 / 2 of the water, stir, and prepare cement slurry;

[0005] 3. Add rubber powder to the cement slurry in 2-3 batches, stirring for 60 seconds each time, with an interval of 30-40 seconds between each batch; to prepare cement-rubber slurry.

[0006] 4. Add sand, gravel, bentonite, and clay to the cement rubber slurry, stir for 3-5 seconds until evenly mixed, then add the remaining water and stir thoroughly for 30-60 seconds; prepare plastic rubber concrete for pouring.

[0007] The beneficial effects of this invention are as follows: Through the above solution, the interfacial bonding strength between cement and rubber particles is high, the rubber particles are coated with cement slurry, the particle density is increased, they do not float, and they are evenly distributed in the cement slurry, such as... Figure 1 and Figure 2 .

[0008] Instruction manual illustrations

[0009] Figure 1 Rubber aggregate floats on top of concrete

[0010] Figure 2 Rubber aggregate is evenly distributed inside the concrete. Specific Implementation

[0011] Implementation Method 1: During the construction of a high-fluidity rubber concrete project, in order to prevent the rubber aggregate from floating, 150 kg / m³ of cement and 50 kg / m³ of water were first placed in a mixing tank and mixed to form cement slurry. Then, 30 kg / m³ of 40-mesh rubber aggregate was added and mixed for 15-20 seconds. After the mixture was evenly mixed, 120 kg / m³ of bentonite, 60 kg / m³ of clay, 760 kg / m³ of sand, 810 kg / m³ of crushed stone, and the remaining 200 kg / m³ were added to the mixing tank in sequence and mixed again for 40-60 seconds until the material was discharged and the concrete was poured.

[0012] Implementation Method 2: During the construction of a rubber concrete project with a slump of 180cm-220cm, in order to prevent the rubber aggregate from floating, 120kg / m3 of cement and 40kg / m3 of water are first placed in a mixing tank and mixed to form cement slurry. Then, 30kg / m3 of 60-mesh rubber aggregate is added and mixed for 15-20 seconds. After being mixed evenly, 160kg / m3 of bentonite, 40kg / m3 of clay, 740kg / m3 of sand, 820kg / m3 of crushed stone and the remaining 180kg / m3 are added to the mixing tank in sequence and mixed again for 40-60 seconds until the material is discharged and the concrete is poured.

Claims

1. A method for avoiding the floating and uneven distribution of rubber aggregates during rubber concrete construction, specifically including the following steps: (1) Weigh the raw materials according to the rubber concrete mix proportion. The raw materials include cement, sand, crushed stone, water, rubber powder, bentonite, and clay. Cement: Sand: Crushed Stone: Water: Rubber Powder: Bentonite: Clay = 4-6%: 30-35%: 30-35%: 12-13%: 0.5-1.5%: 2-3%: 6-8% (2) Add cement to a cement mixing tank, then add 1 / 3 to 1 / 2 of the water, stir, and prepare cement slurry; (3) Add rubber powder to the cement slurry in 2-3 batches, stirring for 60 seconds each time; with an interval of 30-40 seconds between each batch; to prepare cement-rubber slurry; (4) Add sand, gravel, bentonite and clay to cement rubber slurry, stir for 3-5 seconds to mix evenly, then add the remaining water and stir for 30-60 seconds to prepare plastic rubber concrete for pouring.

2. The application of the method described in claim 1 for avoiding the floating and uneven distribution of rubber aggregates during rubber concrete construction in engineering.

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