Can weathered sand be used in construction?

2021-05-19

With the increase in the scale of infrastructure construction, there has been a shortage of river sand resources, and the country prohibits illegal river sand mining operations. The promotion and application of high-quality machine-made sand has become an important measure to solve construction aggregates. At present, machine-made sand made by crushing and grinding stones is gradually becoming a substitute for natural sand and stone and is widely used by enterprises.

Weathered sand is a substance formed by rocks that are broken and loose under the action of solar radiation, atmosphere and water for a long time. The characteristics of weathered sand are that the grains are angular, weak in strength, uneven in size distribution, and contain a certain amount of fine soil particles.

Weathered sand is not recommended as construction sand

According to the latest national revision of the construction sand standard, machine-made sand refers to rock particles with a particle size of less than 4.75 mm made by mechanical crushing and screening after soil removal treatment, but does not include soft rock and weathered rock particles.

Relevant experts from the Professional Committee of Hunan Sand and Stone Industry Association said that sand and gravel materials such as sea sand, weathered sand, and muddy sand are time bombs buried in concrete and should be taken seriously. He said that the sand and gravel products on the market are mainly divided into three categories: natural sand, machine-made sand and mixed sand, and the quality of some gravel products is worrying.

Application range of weathered sand

“River sand is relatively in short supply. In the second half of last year, there was even a need for cash purchases, and the price also rose.” A staff member of the Technical Department of the China Construction Fifth Engineering Department told the reporter of Xiaoxiang Morning News that weathered rock machine-made sand can also be used in construction projects. Season will use more, because at that time there was less river sand and the price was high. However, it is necessary to strictly check the fineness modulus and mud content of machine-made sand before use, and it is not recommended for high-strength concrete.

The investigation proves that there are a lot of weathered sand phenomena along the Shaolin Temple to Luoyang Expressway. The physical and mechanical properties of weathered sand and various road performances of cement stabilized weathered sand have been tested. The results show that cement stabilized weathered sand has good mechanical properties. , Can be used to build roads.

Weathered sand has strong water resistance. Weathered sand is also faster to consolidate and can be used as a good permeable or semi-permeable material. The weathered rock sand making process is to crush the weathered sand from the excavation, so that the weathered sand with poor density is thinned and crushed under the action of the exciting force; then it is washed with water to wash away the traces of stone powder and impurities in the sand to reduce The mud content in the sand, the purification of the sand and gravel content, and finally the sand material that meets the requirements of the building. LZZG is a manufacturer of weathered rock sand making equipment, sand washing and screening equipment. The product is easy to install and move, and has a high degree of automation. Customers who are interested in machine-made sand are welcome to contact us.