Japan Concrete Technology

What Japan Concrete Technology does

Japan Concrete Technology (日本コンクリート技術株式会社) is a Tokyo-based, privately held construction consulting firm founded in April 2004 and headquartered in Sumida-ku. With 1-10 employees and ¥24M in registered capital, the firm operates as a niche technical specialist in concrete construction, with a primary focus on temperature-crack prevention in mass concrete structures. It serves Japanese general contractors, specialty concrete subcontractors, and government/public-works agencies, with academic ties to Utsunomiya University and Tokyo Institute of Technology.

The company's core competency is encapsulated in a portfolio of patented methods: the ND-Rebar Method (Patent 7675050), ND-Retarder Method (NETIS TH-120031-VE), ND-WALL Method (Patent 5270112), SDP Form high-durability permanent formwork (Patent 717741), and the Seacomb Method (Patent 7672095) for composite bridge pier construction. It also distributes PCa precast concrete products (Pittan Ditch, Cable Trough) and a Finish Coat surface treatment. The intellectual property is supported by NETIS registrations, which provide government-validated technology status for public procurement.

Revenue is generated through three mechanics: (1) technical consulting engagements billed at ¥47,700–¥236,800 per day, (2) recurring annual advisory contracts (Type A at ¥1.2M/year with priority access, Type B at ¥600K/year), and (3) one-time publication sales, including certification exam preparation books for the concrete diagnosis and maintenance technician licensing track. Project delivery has spanned Hokkaido to Kyushu, and the firm's customer roster includes Penta-Ocean Construction, Sumitomo Mitsui Construction, Maeda, Toyo Construction, Tekken Construction, Kajima Road, Konoike Construction, and Kitazawa.

Name

Japan Concrete Technology

Legal name

日本コンクリート技術株式会社

Website

https://jc-tech.co.jp

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

1–10 employees

Short description

Japan Concrete Technology is a Tokyo-based construction consulting firm specializing in temperature-crack prevention and mass concrete methodologies, serving Japanese general contractors and government agencies through patented ND-series methods, technical advisory contracts, and certification publications.

Ownership category

akta.pro rank

NAICS

Poured Concrete Foundation and Structure Contractors (23811), Cement and Concrete Product Manufacturing (3273), Structural Steel and Precast Concrete Contractors (238120), Poured Concrete Foundation and Structure Contractors (238110)

SIC

Services-Engineering Services (8711), Concrete, Gypsum & Plaster Products (3270), Adhesives & Sealants (2891)

akta.pro primary industry

Concrete Repair, Crack Injection & Grouts (IMADAOAD)

akta.pro secondary industries

Road Maintenance & Asset Preservation (Resurfacing, Patching, Crack Sealing) (IMAFAEAF), Concrete Repair, Sealing & Waterproofing (Coatings/Membranes) (IMAIAKAK), Concrete & Cement Finishing (EDAOAAAC)

Keywords

• Concrete technology consulting
• Mass concrete crack prevention
• Temperature stress analysis
• Embedded formwork systems
• Construction certification prep

Headquarters

HQ city

Sumida

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Others

Revenue model

1. Consulting Services: Core consulting services on concrete construction technology including temperature crack prevention consulting, product development, structure investigation/diagnosis, joint research with universities. Billed per technician level (技師長, 主任技師, 技師A/B/C, 技術員) with different rates for Member A, Member B, and non-member clients.
2. Publication Sales: Publishes examination preparation books for Concrete Diagnostician (コンクリート診断士), Concrete Technician (コンクリート技士), and Chief Concrete Technician (コンクリート主任技士) certifications. Books are sold annually with updated editions (2026 editions released March 2026).
3. Annual Advisory Contracts: A契約 (¥1.2M/year) and B契約 (¥600,000/year) annual advisory contracts providing discounted consulting rates, technical information via member website, and priority support.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Japan Concrete Technology provides specialized consulting and proprietary methods for temperature crack prevention in mass concrete structures used in bridges, culverts, retaining walls, and other large-section infrastructure. The firm sells its ND Series methods (ND Rebar, ND Retarder, ND-WALL), SDP Form embedded formwork, Finish Coat surface treatment, and the Seacomb composite bridge pier method, alongside 3D FEM thermal stress analysis, joint university research, and certification exam preparation books for concrete engineering credentials.

Product overview

Japan Concrete Technology is a concrete technology consulting company offering a comprehensive suite of products and services centered on temperature crack prevention for mass concrete structures. The core product line is the ND Series (ND-WALL工法, NDリターダー工法, NDリーバー工法) - proprietary temperature crack prevention technologies with over 100 combined implementations nationwide. Complementary products include フィニッシュコート (surface finishing aid), SDPフォーム (high-durability embedded formwork), and precast products (ぴったん溝, ケーブルトラフ). The company also provides consulting services with 3D FEM thermal stress analysis and publishes examination preparation materials for concrete certification credentials (コンクリート診断士, コンクリート技士, コンクリート主任技士). All technologies are supported by academic research, technical papers, and annual technical exchange events.

Differentiator

Problem solved

Functional benefit

Brands

• ND Series: Temperature crack prevention technologies including ND-WALL Method, ND-Retarder Method, and ND-Rebar Method for mass concrete structures.
• Finish Coat
• SDP Form
• ND-WALL Method
• ND-Retarder Method
• ND-Rebar Method

Quantifiable outcome

• Temperature stress reduction of 50%+ using ND Retarder Method
• +4 more outcomes

Named customers11 records

Segments3 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core.

• Penta-Ocean Construction (五洋建設)coreStrategic or Co-development Partner · 24 April 2024Joint development partner for Seacomb construction method (シーコーム工法), co-developed with Utsunomiya University. Patent registered April 2024 (Patent 7672095). Penta-Ocean is also a main client receiving consulting services.
• Utsunomiya UniversitycoreStrategic or Co-development Partner · 1 January 2004Joint research partner in concrete technology development. Collaborated with Penta-Ocean Construction on Seacomb construction method development. Technical advisory board includes university professors.
• Technical Advisory Board (Tokyo Institute of Technology, Osaka University, Niigata University, Nagaoka University of Technology, Tohoku University, Kanazawa Institute of Technology)coreStrategic or Co-development PartnerExternal technical advisors including professors from Tokyo Institute of Technology (長瀧重義名誉教授), Osaka University (鎌田敏郎教授), Niigata University (佐伯竜彦教授), Nagaoka University of Technology (下村匠教授, 丸山久一名誉教授), Tohoku University (久田真教授), and Kanazawa Institute of Technology (宮里心一教授). Provides expert consultation and legitimacy to technical services.
• Major Japanese Construction Companies (main clients)coreOthersLong-term client relationships with major Japanese construction companies for consulting services on concrete construction projects. These companies represent the primary customer base for ND series technologies and consulting services.

Scale indicators5 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Sumitomo Osaka Cement Co., Ltd. Japanese cement and concrete materials manufacturer with specialty concrete and admixture offerings. Comparable as a producer of cement-based products and concrete technologies that overlap with JCT's crack-prevention methods and specialty concrete formulations.
• Shimizu Corporation: Major Japanese general contractor with significant in-house concrete technology development and active civil engineering projects. Comparable as a major ゼネコン that both consumes and competes with specialized concrete consulting/method providers like JCT.
• Obayashi Corporation: One of Japan's largest general contractors with substantial in-house concrete R&D and proprietary construction methods. Comparable because Obayashi operates as both a customer (ゼネコン) of JCT's consulting methods and a developer of competing concrete technologies in the same mass concrete space.
• Nippon Koei Co., Ltd. Major Japanese engineering consultancy with broad infrastructure and construction advisory practice including bridge, road, and water infrastructure. Comparable as a large Japanese engineering services firm competing for similar MLIT and public-sector consulting engagements.
• Taiheiyo Cement Corporation: Japan's largest cement manufacturer with extensive R&D into concrete admixtures, durability, and specialty concrete products. Comparable because Taiheiyo operates in adjacent concrete technology and admixture markets that overlap with JCT's ND Retarder Method and Finish Coat product lines.
• Taisei Corporation: Major Japanese general contractor with significant concrete engineering capability and infrastructure project portfolio. Comparable as a ゼネコン customer of JCT's consulting services and a potential competitor in mass concrete construction methods.
• Kajima Corporation: Japan's largest general contractor with extensive R&D including proprietary concrete technologies and active public infrastructure work. Comparable as a top-tier ゼネコン in JCT's customer base and as a developer of competing mass concrete construction methods.

Direct peers

• Fudo Tetra Corporation: Japanese specialty contractor focused on civil engineering and ground improvement, including extensive work on concrete foundations, slope stabilization, and mass concrete placement. Comparable as a specialty contractor in the same mass concrete and foundation technology space where JCT's ND Series operates.
• Pacific Consultants Co., Ltd. Large Japanese engineering consultancy providing infrastructure and construction-related engineering services across transportation, water, and civil projects. Comparable as a Japanese engineering services firm competing for the same consulting engagements that JCT serves in mass concrete infrastructure.
• CTI Engineering Consultants Co., Ltd. Mid-sized Japanese engineering consultancy focused on infrastructure, water, and disaster prevention projects. Comparable as a domestic engineering services peer competing for similar public-sector and contractor consulting work in concrete infrastructure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Japan Concrete Technology