Turn dirty sand into clean sand

Before the situation of construction sand becoming exhausted, lying deep in the river and many impurities, sand washing solution has contributed to increasing the life of the project, saving sand resources .

Construction sand in the Mekong Delta and the Southeast region after a long time of sand exploitation is increasingly exhausted, sand is located deep in the river, so there are many impurities, dust, mud, organic clay and other harmful substances, difficult to control. control, affect the quality of construction. Looking forward to creating clean sand products that meet the standards of construction sand to both improve the quality of the construction and save investment costs, after many years of concern, Mr. Vo Tan Dung, Trade-Construction Co., Ltd - Transportation Phan Thanh has successfully researched sand screening system.

Sand is equipped with sand boats with vacuum sand from the Sai river
Gon up and leveled the ground in District 2, Ho Chi Minh City (Photo: Nguyen Huu)

The sand cleaning process of the system is quite simple. Sand is taken from the mine to the screening system, separating impurities. Clean sand is deposited at the bottom of the collection cell, then is exposed on concrete substrate, testing the cleanliness and size of grain components to determine the type of quality provided by customer requirements. After being treated by sand washing system, the ratio of remaining dust is less than 0.8%. During the filtration process, the amount of waste water carrying small sand, dust will follow the water flow into the sedimentation pit, be recovered to use for sand filling.

Mr. Dung said, clean sand is one of the important factors to make concrete mortar and mortar without water permeability, wall construction of moisture and mold, help paint color stable, not peeling, copper Time to ensure aesthetics and save paint maintenance costs during the use time, save the cost of capital construction investment. With the same conditions, the strength of the concrete made of sand is 10-20% larger than that of untreated sand.

Sand used in construction works (Photo: Nguyen Huu)

If all costs are calculated, 1m ^{3 of} sand has not passed the filter is 144,800 VND, but the buyer can only use about 90% due to loss of 10% of impurities. While clean sand prices are priced at 150,000 VND / m ³ , users can get 100% of volume and are assured of quality. In particular, the unburnt sand washed the porosity higher than the sand washed and the amount of sand to be washed is higher than that of the unpolluted sand, so sand is used to wash more customers.

According to the Center for Construction Inspection and Consultancy (Can Tho University), sand used for construction must comply with strict regulations on cleanliness and percentage of grains. The sand source in the Mekong Delta is mostly taken from the river bed, so the proportion of dust, clay, organic impurities accounts for a large proportion, needing to be screened.'Clean sand washing equipment system with sand construction standards' won the first prize at the 6th Can Tho Technical Innovation Contest in 2011 and received the certificate of merit from Can Tho City People's Committee.

Currently, the 'Clean sand sieving equipment system with sand construction standards' of the author Vo Tan Dung has been accepted by the National Office of Intellectual Property to validate the application for registration of trademarks and industrial designs of the system. Sand washing system.