Our products at a glance:

Hawk multi-functional block machine is designed to meet the mass and stable production of a variety of blocks by changing the different molds. This contains the production of bricks, pavers, hollow blocks, kerbstones etc. With humanized designed aviation plugs for connection and automatic control system, the machine is extremely easy to use for everybody Learn about our concrete block making machine.

Hawk provide precise dosing and mixing plant which gives accuracy recipe for concrete. Automatic dosing and mixing plant can also save labor cost. Learn about our Doing and mixing plant.

Selected by more than 95% customers, with success experiences for more than 1000 plants in more than 60 countries. Basic block making plant is the typical way to build a factory, with all standard parts. Learn about our Basic block making plants.

Hawk mobile plant is designed as a whole block making plant running on trailer, based on stationary plant, it has both advantages of mobile machine and stationary machine. Which requires less land, less labors, no foundation and can easily move to another site. Learn about our Mobile block making plants.

Hawk K series block machine is specially designed according to the european standard. Heavy-duty steel structure with antifatigue treatment; Imported Germany vibration motor; Full-customized Yuken hydraulic system; LS Master K series PLC control. All make K series unique and amazing. Learn about our K series fully automatic plants.

Standard products or tailor made? As you wish. Learn more about Hawk stone mold

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About curing you have to know 关于养护你需要知道的

The ambient temperature (surrounding temperature) plays an important role in determining the speed of the hydration process (hardening process). The warmer the air, the warmer the concrete and the quicker the concrete strength gain. There are different methods of curing as listed below;
Natural Curing
In countries where the climate is favorable, green blocks are moist cured at normal temperature of 20°C to 37°C (as in the South of China). This type of curing which at 4 days would normally give 40% of its ultimate strength. Initially, green blocks should be placed in a shaded area or enclosed chambers for about 8-12 hours (depends on relative weather conditions i.e. temperature, humidity etc). After that, the blocks can be transported to an assembly yard for further curing for about 28 days to reach 99% of its maximum strength. For optimal final products, the fresh blocks need to be sprinkled daily, for the first 7 days (morning and evening) to maintain the moisture content for higher reactivity of cement with sand.
 
Low pressure Steam Curing
Steam curing at atmospheric pressure at temperature of 65ºC in a curing chamber accelerates the hardening process. The main benefit of steam curing is the rapid strength gain in the units, which allows them to be placed in inventory within hours after they are molded. 2-4 days after molding, the compressive strength of the blocks will be 90% or more of the final ultimate strength. Besides, steam curing produces units of lighter color than is usually obtained with natural curing.
Initial temperature of the concrete shall not be raised above 48ºC for a minimum of 2 hours after the units have been cast
The rate of increase after 2 hour period shall not exceed 15°C/hr and the maximum temperature shall not exceed 65ºC.
The maximum temperature shall be held for a period sufficient to develop the required strength (4-5 hours)
Rate of decrease in temperature shall not exceed 10ºC/hr.
Units shall be kept covered for a minimum of 24 hours after casting.

High pressure steam curing
This method uses saturate steam at pressures ranging from 125 to 150 psi and temperature of 178°C. This method usually requires additional equipment such as an autoclave (kiln). The strength of high pressure cured concrete masonry units at one day age are equivalent to the 28 days strengths of moist-cured blocks. This process produces dimensionally stable units that exhibit less volume change (up to 50% less). However, autoclave unit requires a much higher investment.
 
*Practical Suggestion for Curing
28-days curing to gain the full strength of masonry product is based on concrete which is slightly different when applying for the dry mix material for the block making. It is very commonly now cement is added with high quality Fly –Ash, and under the favorable conditions like the temperature and humidity, the compressive strength of the block/paver will gain up to 80% in less than 7 days curing. By using the #425 type cement and design the mix proportional at least 20% higher than the required compressive strength (Mpa), the block/paver will be qualified to be delivered to the clients.