How to fix porous concrete

Greeting, how are you steemit friends? Hopefully still the spirit of the day, this increasingly difficult day, we should not lose the spirit, though we often fall and trampled but immediately rose to pursue with new strength, fall is the right moment to improve the step and take care of the stamina then after all controlled immediately arise , no matter how you fall because here we learn how to get us up immediately.
My brother, today I am going back to writing about science that may be of benefit to you, as for what I will write about "Porous On Reinforced Concrete", concrete is a mixture of portland cement, coarse aggregate and water with other additives.

The main properties of the concrete are very strong against the press load but are unable to withstand the tensile load. Concrete reinforced concrete is a reinforced concrete reinforced concrete with an area of reinforcement that is not less than the minimum value required with or without prestress, the main properties of the reinforcing steel are very strong against the tensile load and the compressive load. The use of the two main types of materials has advantages and disadvantages so that when combined these two materials can complement each other in the hope to produce the required material strength.

ISSUES

My brother, if you have ever done concrete or casting work then you must have seen the concrete is porous, true porous concrete will lead to defects in the casting results that impact on the strength of reinforced concrete so as to produce the strength of the defective concrete structure, it could be your job will be rejected by owner and you will lose.

^{workers are doing casting work. Source image : id.wikipedia.org}

Need to know what causes the porous concrete include:

The dirty formwork
Formwork that has been used more than twice will result in dirty, there will be residual concrete attached to the surface formwork that result in imperfect casting,
Lack of water when casting
Lack of water in the mortar will cause the mixture of aggregate is not mixed perfectly, so that the concrete can be porous.
Lack of cement
Lack of cement that serves as an adhesive can cause pebbles or sand is not completely binding.
Stirring uneven
Almost the same as the cement deficiency that resulted in every material not mixing perfectly.
Compaction is less than perfect
When the casting stage is not compacted there will be an empty part of the structure causing structural defects
Formwork is not tight
If the formwork is not fitted tightly it will cause the cement liquid to come out of the formwork so that the material will be short of cement as adhesive
Deliberate factors
There are several reasons to make it porous, as for aesthetics to produce coarse textures and so on.

SOLUTION

In case of porous concrete structures we can perform "Core Drill" and a compressive test to the Concrete Technology Laboratory. For concrete repair methods concerning the magnitude of the following kropos there are several fixes:

If it occurs during the execution by the contractor, the contractor shall fix it at his own expense and can not be counted as additional work.
The following Distribution Type-Type porous, porous type can be divided into 4 types:
a. Type I: Porous only on the skin of concrete only, the concrete aggregates are still well attached.
b. Type II: If the porous happens until the outer reinforcement iron has been seen with a depth of 3 s / d 5 cm.
c. Type III: when porous that occurs until the inner bone iron has been seen with a depth of 5 s / d 7 cm.
d. Type IV: When the porous is larger 7 cm half of that in Cor porous.
When this occurs, the Implementer shall undertake an attempt at the expense of his own. Improvements that must be done in overcoming the four types of porous is as follows:
Type I: The porous area is cleaned, plastered again with mortar 1 Pc: 2 Sand.
Type II: Preparing the surface of the concrete to be repaired, Porous concrete, porous in the dagger with a small chisel and pointed. Porous holes are formed so that the dukan concrete can enter well into it and not easily detached again. The surface of the concrete is cleaned of all dirt, dust, loose sand and others using a steel wire brush, then cleaned / washed with water.

The surface of the concrete is left to nearly dry. Use epoxy, the surface of the concrete must be completely dry, well sprinkled epoxy well and evenly.
Repairing Regeneration Existing cleansing of all dirt, rust and others by using a steel brush.
Pengawasan, Before the repair / plaster / in Cor, then the Executor should ask permission supervisor and ask for work to be repaired, checked first.

^{workers are fixing defects on concrete surfaces, Source image : www.ilmurumah.com}
CONCLUSION

Structural concrete porosity can cause structural defects that are fatal to buildings that are done either intentionally or not, otherwise no concrete porous has crossed the specified threshold then we have to disassemble and create a new one.
Porous concrete can we avoid by doing the work in accordance with the provisions that have been determined.

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