Grouting, Method


Grouting is the filling of cracks and gaps in the ground and buildings with mortar and cement to fill the cracks. Also known as grout or chemical injection. It has the effect of impermeable water and prevent water leakage, and is widely used for fixing rock bolts in tunnel excavation and for impermeable purposes in dam construction.

Parfait grout method

Parfait grout method and a day in Construction developed by structures(maintenance and repair)for Grout filling method(repair / reinforcement)can, in principle, parfait graft(cement-based filler)/parfait plant(construction equipment), combining diverse structures (1.5~24N/mm2 or over)and cavity gap (width of 1 cm or more) The grout filling the can. In addition, the software grout depending on the application, formulation No. 1(long-range blending)/No. 2(lightweight blended)/No. 3(high strength formulation)/No. 4 (air mortar mixing)of various formulations composed, and the(full plant)COGMA by the system of grout flow rate/pressure is automatically controlled,injection/construction can be used. Incidentally, parfait grout method NETIS registration technology, cavities, and voids focus on other,ground anchor fixing of injection/underground pipe blockage, such as to apply to the General construction of the flow,injection hole drilling from injection pipe installation, the injection hose is attached (grout) injection to the required number of times to repeat, and the removal after the injection pore clogging, and equipment for carrying out a series of flow with it.

What is the difference between mortar and grout?

Grout is a general term for materials that are injected into the gap. Non-shrink mortar is often used as a grout material. Mortar is a mixture of cement, water and fine aggregate. This time, I will explain the difference between mortar and grout, their meaning, non-shrinkage mortar, and the relationship with steamed buns.

Non-shrink mortar is also called base mortar or column bottom leveling mortar. For details, refer to the following.

The differences between mortar and grout are shown below.

Mortar ⇒ Material mixed with cement, water and fine aggregate

Grout ⇒ A general term for materials that fill gaps

Non-shrink mortar ⇒ A mortar that does not shrink. Often injected between the foundation and the base plate.

Relationship between mortar, grout and non-shrink mortar

Grout material is a general term for materials that fill gaps. “Mortar” is a material often used as grout material. For the mortar used as grout material, “non-shrink mortar” that does not shrink is used.

Mainly non-shrink mortar is injected from under the base plate of the column base to the top of the foundation. The thickness of this mortar is generally 30 mm and 50 mm.

The non-shrink mortar used as grout material generally uses the following materials. The expansion material used for the admixture is a material that prevents shrinkage.

・ Mixing is cement 1: sand 2 by volume.

・ For cement, use ordinary Portland cement or early-strength Portland cement.

・ Cement-based expansion material is used as the admixture.

Relationship between non-shrink mortar and steamed bun

Non-shrink mortar is called “manju” in field terms. First, make the non-shrink mortar by the specified thickness as shown in the figure below. Since this resembles the shape of a steamed bun, non-shrink mortar is called a steamed bun.

Under the base plate, fill the remaining gaps with non-shrink mortar.


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