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Sand-based Permeable Bricks

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Sand-based Permeable Bricks

Sand-based permeable brick uses silica sand as the main aggregate or surface aggregate to binder as the main bonding material sintering-free, with drainage function of the pavement brick. Similar products also include richer colors of silica sand and silica sand drainage rocks. Raw Thai-based sand-based permeable brick for pavement, squares, corridors and other non-motor vehicle road pavement; silica sand filter water, silica sand filter rock for slow lane, parking and other road pavement. Compared with similar permeable brick (concrete permeable brick, ceramic permeable brick), Shengtai sand-based permeable brick not only prevents the clogging of dust, but also has the long time-effect water permeability and is easy to maintain.

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Compressive strength (MPa)≥40.0
Flexural strength (MPa)≥4.0
Permeability rate / mL / (min · cm2)≥1.5
Permeability aging / times≥10
Water filtration rate /%≥90

Anti-freeze-thaw resistance

Hot summer and cold winter area25 freeze-thaw cyclesThe number of appearance after the freeze-thaw cycle should meet the requirements of Table 2;

The number of freeze-thaw cycles after the quality loss ≤ 20%;

The number of freeze-thaw cycles after the compression strength loss rate ≤ 20%

Cold area50 freeze-thaw cycles
Severe cold area75 freeze-thaw cycles
Skid resistanceBPN≥70
Water retention / g / cm3≥0.06

Wear resistance / mm

Grind pit length ≤35

Weatherability

Exterior

No damage

Color difference

≥3 level

Note 1: In the hot summer and cold winter area, the coldest month average temperature is between 0 ℃ and 10 ℃, and the hottest month average temperature is between 25 ℃ and 30 ℃.

Note 2: The coldest month average temperature is 0 ℃ ~ 10 ℃;

Note 3: The coldest month is the coldest month average temperature is not higher than -10 ℃.

The sand-based pervious brick pavement structure mainly consists of surface layer, PZG permeable and adhesive leveling layer, base layer, cushion layer and soil base layer. The typical pavement structure is shown in the following table:

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Structure layer name

Structure commonly used components

Features

Surface layer

sand-based permeable brick

Direct load, water, water, anti-wear, anti-skid

PZG water-binding adhesive leveling layer

PZG + medium course sand

Permeable, water storage, construction leveling, connecting the surface layer and the base level, with a certain intensity, and prevent the rain will be coarse sand leveling layer rushed to the base level

Base level

Permeable concrete

Mainly bear the load, water, water storage

Cushion

Graded gravel

Grass-roots load, water, water

 

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Technical points:
1, Health and Thailand sand-based permeable brick surface layering to be done edge restraint treatment (such as curb edge) to prevent infiltration of rain infiltration, the edge does not ask basic bearing capacity weakened;
2, PZG adhesive leveling layer by the high permeability of proppant, mixed with a small amount of sand mixed with coarse sand, both to play the role of high-strength support consolidation, but also can play a rapid water permeability. The traditional method of leveling layer is made of cement sand, the amount of cement is too large, easily lead to leveling layer impermeable, impermeable to water permeability, or the amount of cement is too small, not the role of consolidation, the rain will easily leveling layer Sand into the grassroots caused the overall structure instability;
3, parking lot, slow lane and other load-bearing structures to be laid grass-roots and cushion, the pavement thickness should not be less than 150mm, pedestrian walkway may not be laying grassroots, cushion thickness should be not less than 200mm;
4, when the water-permeable pavement under the soil-based impervious pavement (such as underground parking, civil air defense facilities, etc.), the design of the grass-roots level should be timely export of rainwater.