Precautions for using high-strength road repair materials in highway pavement repair

Price of support grouting material Tai'an Xintai early strength grouting material

Strength is one of the indicators of stone strength, which has a direct impact on the mining, processing, use, maintenance, renovation, and other aspects of stone. Excessive intensity will bring difficulties to mining, processing, use, maintenance, grinding, and renovation, resulting in reduced economic benefits; If the strength is too low, it will lead to a decrease in the lifespan of the stone, and the maintenance and renovation costs in the decoration and renovation costs will be too high, affecting normal use. Compressive strength refers to the stress value that a stone sample can withstand under unidirectional compressive force until it fails, and is a commonly used strength indicator. The relevant national and industry standards in our country respectively stipulate the testing methods and indicators for the compressive strength of natural decorative stone slabs and raw materials after drying, water saturation, and freeze-thaw cycles.

When high-strength road repair materials are applied to road surface repair, a lot of things need to be mixed in order to achieve strength. Although high-strength road repair materials have high strength, they are relatively brittle overall. In this case, it is recommended to add steel fiber high-strength road repair materials during the mixing process, which can produce buffering under huge pressure.  

Secondly, it is necessary to choose high-strength road repair materials that solidify quickly and reach strength within 2 hours, because during road repair, it is necessary to open to traffic in a short period of time.

Then, when selecting steel fibers, it is important to pay attention to the proportion of addition, which depends on different situations, such as high-strength road repair materials and steel

Please refer to the guidance of technical personnel from the grouting material manufacturer for the proportion of fibers.

Price of support grouting material Tai'an Xintai early strength grouting material

Banshi: It has a plate-like structure and can be peeled into pieces along the bedding plane. It can be used as a decorative material. Shallow metamorphic rocks formed through slight metamorphism are collectively referred to as Banshi. The physical and chemical characteristics, color, and texture of stone are closely related to the mineral composition it contains. The color of granite is mainly determined by the color and quantity of feldspar. Different varieties of feldspar exhibit different colors. Potassium feldspar is flesh red and gray white in color, so when rocks contain a high amount of potassium feldspar, they often appear red, such as the "Maple Leaf Red" in Guangxi, the "Noble Consort Red" in Shanxi, and the "Indian Red" in India. It should be noted that many red granites containing potassium feldspar will gradually fade under irradiation or even at higher temperatures.

Steel fibers need to be added during the mixing process to ensure even mixing.

Cleaning the road surface:

1. The road surface needs to be cleaned thoroughly and there should be no debris

2. Need to carve out a certain height for grouting

3. Need maintenance, watering and moisturizing the road surface

4. After the road repair, it will be open to traffic in about 2 hours.

The actual amount of raw materials obtained in mining production is the actual raw material rate. Theoretical waste rate: also known as volumetric waste rate. Based on a specific composite map drawn from representative joint and fissure sketches, the method of cutting and cutting raw materials according to certain specifications is designed to obtain the raw material rate. Trial mining waste rate: It is the waste rate obtained by selecting a point that can represent the development of joint fissures, bedding planes, and color lines in the mining area from the measurement points of the waste rate in the volumetric diagram. The trial production volume is generally not less than 5 to 1 cubic meter. The output rate is expressed in square meters per cubic meter: output rate=area of sawn board (square meters)/volume of sawn raw materials (cubic meters). Overall, the total loss of granite raw materials processed into rough boards (raw materials → rough boards → rough boards) is between 34% and 52%.

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This is stipulated in the "Technical Specification for Metal and Stone Curtain Wall Engineering" (JGJ133-21) as follows: resin type stone special structural adhesive should be used to bond between the stone slab and the stainless steel pendant. The State Economic and Trade Commission issued the "Adhesive for Dry Hanging Stone Curtain Walls" (JC887-21) in December 2021, which was implemented on June 1, 2022. Based on the characteristics of stone curtain walls, six mandatory indicators were stipulated. This regulation has been in place for more than five years, but structural adhesives have not been used in some projects, let alone resin type stone specific structural adhesives. At present, the commonly used adhesive is still Hercules glue, which is a glue used to bond stones to each other. It is unscientific to use Hercules glue for the bonding between stone and metal. Its toughness, elasticity, and bonding strength are many times weaker than dry hanging glue for stone, and it is easy to penetrate and corrode the stone when the metal corrodes.