List of Civil Engineering Materials products

Clear visibility with transparent glass! Recommended for store and building entrances.

• Disaster prevention fittings
• Entrance/Exterior Doors

In repairs that do not require chipping, you can prolong the lifespan of the bridge without damaging the deck and reduce maintenance costs!

• Bridge Materials

For tunnel construction and night work! Displaying highly visible virtual signs to contribute to safety management.

• Road signs and road accessories

At Rontai, we handle three types of domestically produced seeds: Japanese pampas grass, power grass, and mugwort!

• Slope protection material

We offer a wide variety of native grasses, woody plants, and non-native grasses (tall and short)!

• Slope protection material

This is a list showing the seeds included in greening materials such as vegetation sheets, vegetation mats, and vegetation soil bags!

• Slope protection material

Flexible piping power! It excels in flexibility and can be bent freely without the need for special tools! We have added quick-connect fittings.

• Piping materials (plastic pipes)

This was used for the seismic reinforcement work on the main girders of bridges in Kanagawa Prefecture on the Tomei Expressway.

• Bridge Materials

"ART BLOCK PRODUCT GUIDE". A variety of functional paving materials with excellent heat insulation and moisture retention properties are featured!

• Exterior and paving materials <General>
• Paving Materials
• Concrete block, ALC panel, extrusion molded cement board construction

Water-curing solidified joint sand that balances workability and aesthetics.

• Joint material
• Concrete block, ALC panel, extrusion molded cement board construction
• Paving Materials

A base block that exhibits ultra water retention performance due to a super-micro porous ceramic material.

• Concrete block, ALC panel, extrusion molded cement board construction
• Exterior and paving materials <General>
• Paving Materials

The mechanism of visible shadows! Introducing concrete blocks with slits for paving.

• Concrete block, ALC panel, extrusion molded cement board construction
• Exterior and paving materials <General>
• Paving Materials

A new structure that strengthens interlocking block paving, achieving both longevity and flatness.

• Concrete block, ALC panel, extrusion molded cement board construction
• Exterior and paving materials <General>
• Paving Materials

The next standard that is long, beautiful, and chosen.

• Concrete block, ALC panel, extrusion molded cement board construction
• Exterior and paving materials <General>
• Paving Materials

The gentle-feeling transparent plate promises a reassuring walking experience! A wide variety of colors available!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

A block with a natural color and texture using natural stone on the surface! Choose your environmental performance!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

High quality! Eco-friendly products with a variety of colors created from incinerated waste ash.

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

Excellent permeability and reduces water splashing! Ideal permeable blocks for parks, squares, and streets with abundant greenery.

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

A block with a texture like natural stone, enhanced with high safety for permeability and drainage effects!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

An environmentally harmonious pavement that combines the color and permeability of natural stone! It also helps prevent urban flooding.

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

Using highly reflective aggregates on the surface! Suppresses heat retention and alleviates the heat island phenomenon.

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

A rich variety of 14 colors that can beautifully arrange urban spaces!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

An elegant expression with a sense of heaviness creates an urban space! Achieving a walkable environment!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

Classical details reminiscent of Southern European streets! Timeless natural materials!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

Two types of guidance blocks provide comfortable and safe walking for everyone!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

Prevent the occurrence of step differences and misalignments for a long time, maintaining a safe, comfortable, and beautiful pavement surface.

• Tensioning and connecting blocks
• Various blocks

Soil-like water retention contributes to alleviating the heat island phenomenon! It also helps prevent urban flooding.

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

A vegetation block with a greening rate of 61% that adds greenery to the streets and creates a lush landscape!

• Various blocks
• Concrete block, ALC panel, extrusion molded cement board construction

原材料由来のCO2排出量約40％減。高い流動性と優れた強度発現性も両立

• Paving Materials

Slope protection works specialized for alkaline soil, such as embankments and tunnel spoil using cement-based solidifying materials (for ponds, retention basins, road improvements, and riverbank prote...

• Slope protection material
• Baskets and futon baskets
• Civil Engineering Method

To prevent rear-end collisions and crashes at parking lot entrances and exits! Encourages vehicles in motion to slow down and come to a temporary stop, increasing drivers' attention to what is ahead. ...

• Car and bicycle parking facilities
• Parking lot facility construction
• Road signs and road accessories

A groundbreaking product that changed the common understanding of steam traps, contributing to CO₂ reduction by reducing steam usage: Columnar Hole Type [Steam Saver].

• Piping materials (copper pipes, cast iron pipes)

No water leaks at all! The panel shape is strong not only against water stoppage but also against impacts from floating debris and other objects.

• Water stop

The functions are different! It protects various assets from flooding caused by typhoons and heavy rain.

• Water stop

To prevent rear-end collisions and crashes at parking lot entrances and exits! Encourages vehicles in motion to slow down or come to a stop, increasing drivers' attention to the road ahead. Also helps...

• Car and bicycle parking facilities
• Parking lot facility construction
• Road signs and road accessories

Traffic can be opened within a day! The curing time until traffic opening is approximately 24 hours.

• Paving Materials
• cement

CO2 emissions during manufacturing have been reduced by approximately 40% compared to conventional methods! This is a low-carbon type of injection material.

• Paving Materials
• cement

Exhibiting a high water absorption rate of about 80%! This product has a significant effect on suppressing surface temperature and is also excellent in durability.

• Paving Materials
• cement

Ideal as a 100% permeable water-retaining pavement injection material! It is expected to have lasting effects in suppressing road surface temperature rise.

• Paving Materials
• cement

In addition to strength, a maximum water absorption rate of about 40%! A compressive strength of approximately 4 N/mm² can be achieved with a curing time of 3 hours.

• Paving Materials
• cement

Achieve high strength! A bending strength of over 2.0 MPa can be obtained in 3 hours of curing time, and over 4.0 MPa in 3 days.

• Paving Materials
• cement

Early traffic opening is possible! A compressive strength of over 5 MPa can be achieved with a curing time of 3 hours.

• Paving Materials
• cement

You can choose the type according to the transportation opening! We introduce the quick-strength type that allows for transportation opening in just one day.

• Paving Materials
• cement

Carefully selected raw materials are pre-mixed! On-site, you can obtain a uniform cement milk simply by mixing it with water.

• Paving Materials
• cement

High-speed hard type allows for early release! Ideal backfill material for emergency construction and similar applications.

• grout
• Paving Materials
• cement

There is almost no change in liquidity over time for up to 20 minutes after mixing! It is a product with minimal bleeding as well.

• grout
• Paving Materials
• cement