romote the use of a full set of stone production line equipment

With sand widely used in engineering construction, a full set of stone production line equipment has also been promoted by sand stone production line resulting in different physical characteristics, gradation, robustness, content of harmful substances, stone and mud content, the alkali-aggregate reaction parameters such as the use of materials with different projects.

Select graded sand meet the technical requirements, can replace river sand, with the ratio of ingredients in accordance with rational design methods, resulting in sand Concrete workability, table grind finishing, strength, abrasion resistance and other properties to shrink the design and construction process can meet the requirements of general concrete work.

The preparation of the technical requirements of the general Concrete sand is: hard, clean, graded meet specifications, the maximum particle size of not more than 10mm, less than 0.08mm dust content of not more than 7%.

Sand for Concrete alkali activity tests shall be carried out by the alkali-aggregate reaction test, the specimen should be free of cracks, crisp crack, colloidal spillover phenomenon, deposit expansion during the tests specified age should be less than zero. 1%. Preventive measures: ① limit the amount of cement alkali (Na2O · eq%), the choice of cement alkali content ≯0.6% "low alkali cement"; ② non-reactive aggregate; ③ doped suitable ballast most of mine, pink ash, silica fume and other mixed materials.

Sand fineness modulus should be controlled at between 2.8 to 3.6, our data show: to between 3.0 to 3.3 for the best. Mechanisms to enhance the performance of cement powder in two aspects: ① powder from the nuclei in the cement hydration reaction of cement hydration products induce analysis products, accelerate cement hydration; ② powder participate cement hydration reaction to produce carbon anchor acid water calcium, preventing ettringite to a single type of hydrated sulfur sulphoaluminate transformation.

Workability of Concrete Sand Concrete worse than the natural river sand, can improve its workability by changing or adding an appropriate amount of powder sand ratio (less than 7%).

Stirring feed, it is appropriate to separate the gravel: the cement, gravel, sand or sand, gravel, cement manner favorable and aggregate are mixed, to avoid segregation.

When 7 for pumping coagulation, should adopt mechanisms in the sand, it contains not less than 15% by most 300um sieve particles, should not be less than 5% by 150um sieve particle content.

Use sand stone production line construction not only can make the best, saving investment, but also can effectively stimulate the local economy, especially Spoil the tunnel, you can also protect the environment, turning waste into treasure. That said, the use of sand has enormous social and economic value in the absence of sand area construction projects.