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India's Top Construction Machinery Manufacturer
Cellular Lightweight Concrete at Scale for Affordable Housing
Location: Maharashtra, India | Capacity: 250 m³/day | Plant Type: CLC Block Plant | Year: 2021
A Maharashtra-based developer needed reliable Indian-made CLC block production for an affordable housing project under PMAY. Maruti delivered a 250 m³/day CLC plant from feasibility through commissioning in under 90 days.
A Maharashtra-based real estate developer had secured a Pradhan Mantri Awas Yojana (PMAY) contract to build affordable housing across multiple sites in Maharashtra. PMAY projects operate under strict cost and timeline constraints: the government specifies maximum construction costs per unit, and any cost overrun is absorbed by the developer. The developer had been procuring CLC (Cellular Lightweight Concrete) blocks from three external suppliers — and experiencing two recurring problems.
First, quality inconsistency: different batches of blocks from external suppliers showed varying density (some batches at 550 kg/m³, others at 700 kg/m³ despite the same Grade D0.6 specification) and inconsistent compressive strength. CLC block density variation directly affects wall load calculations, masonry mortar consumption, and thermal performance — creating downstream problems on the construction site that consumed engineering and QC time. Second, price volatility: external CLC block prices had risen 18% in the two years preceding this project, and the developer had no ability to fix costs in a PMAY project with a fixed price ceiling.
The decision to bring production in-house was driven by both economics (locking in production cost rather than purchasing at market price) and quality control (owning the production process to achieve consistent IS 2185 Part-4 D0.6 compliance). The technical brief had three hard constraints: the available site area was 1 acre — smaller than a typical CLC plant requires. The production target was 250 m³/day — enough to supply all active PMAY sites simultaneously. And the client needed to be in commercial production within 90 days of placing the order — a tight timeline driven by site construction schedules.
Maruti Hydraulics designed the 250 m³/day CLC plant layout from scratch for the 1-acre site constraint — a layout exercise that required careful flow planning to eliminate cross-traffic between raw material intake, mixing, mould casting, curing, and dispatch. The solution used a linear flow through the site: raw materials entered at one end, finished blocks exited at the other, with the curing yard occupying the widest central section. No equipment required a footprint that exceeded the site boundaries.
The foam generation system was specified for high output and consistent foam density — the critical variable in CLC block quality. CLC foam quality (measured by foam density in g/litre) directly determines the final block density after curing. Maruti Hydraulics used high-pressure protein-based foam generators with automated density control, reducing foam quality variation to under ±3% between batches. The slurry batching system automated the water-cement ratio control — the other primary variable in CLC density — using load cells on the water dosing system and PLC-controlled cement discharge.
Mix design for Grade D0.6 (600 kg/m³ target density) using the client's local cement source and the specified foam density was validated at the Maruti Hydraulics Nashik facility using sample cement batches from the client's supplier. This pre-dispatch validation step — conducted two weeks before equipment delivery — ensured that the production batching parameters were dialled in before the plant started running on the client's site, saving the 2–3 week trial period typically required when adapting mix designs on site.
The entire plant was erected and mechanically commissioned in 62 days from order. Electrical and control system commissioning took a further 12 days. Trial production batches began in Day 74. The client achieved commercial-grade D0.6 production by Day 87.
Commercial production of IS 2185 Part-4 compliant D0.6 grade CLC blocks commenced within 87 days of order placement — three days ahead of the 90-day target. The plant has produced consistently at Grade D0.6 density (590–615 kg/m³ actual density range across production batches, against the 600 kg/m³ nominal target) since commissioning, with compressive strength consistently meeting IS 2185 Part-4 minimum requirements.
The cost impact was immediately measurable. In-house production cost settled at approximately 22% below the weighted average external procurement price the developer had been paying. On a PMAY project with fixed selling prices, this cost improvement flows directly to project margin — a meaningful improvement on a project type where typical margins are thin. The developer has since extended the plant to supply additional PMAY projects in Maharashtra, running the plant on double-shift operation during peak construction season. Quality complaints related to block density variation — previously a recurring issue with external suppliers — have been eliminated since commissioning.
India's construction materials sector is undergoing a structural shift. Traditional red clay bricks, which dominated Indian construction for decades, are increasingly being replaced by alternative walling materials: AAC (Autoclaved Aerated Concrete) blocks, CLC (Cellular Lightweight Concrete) blocks, and fly ash bricks. The primary drivers are: (1) Supreme Court and National Green Tribunal orders restricting new clay brick kilns near agricultural land and water bodies in multiple Indian states; (2) Green building rating systems (GRIHA, IGBC, LEED India) that award points for alternative walling materials; (3) Energy performance codes under the ECBC (Energy Conservation Building Code) that increasingly specify materials with better thermal mass and lower embodied energy; (4) Construction labour costs rising 8–12% annually, increasing the demand for larger-format blocks that reduce laying time per square metre of wall area; and (5) Real estate developers pursuing RERA compliance and structural quality consistency — both of which favour factory-manufactured uniform blocks over site-mixed materials.
For investors evaluating new construction materials plants, this case study represents a real-world example of the market opportunity — with verified production capacity, commissioning timeline, and operating economics — rather than a theoretical feasibility projection. Every number in this case study comes from an operating plant that Maruti Hydraulics engineers commissioned and handed over to the client team.
Construction machinery projects of this type involve engineering decisions that are not visible in the final product but determine long-term plant reliability and economics. Maruti Hydraulics' engineering approach on this project — as on all projects — prioritises three principles. First, right-sizing the equipment for the specific production capacity and raw material conditions at the site, rather than supplying standard catalogue configurations that may be over-designed (increasing capital cost) or under-designed (limiting scale-up). Second, in-house fabrication of critical components — particularly pressure vessels, structural steel, and control panels — so quality is directly controlled and spare parts are manufactured in India rather than imported. Third, a commissioning approach that measures and documents actual production performance (block density, compressive strength, dimensional tolerance, batch cycle time) before the Maruti Hydraulics engineering team departs, so the client team has baseline data against which to measure plant performance over time.
If you are considering a project in the same product category as this case study, the following conclusions from the Maruti Hydraulics engineering team are relevant. First, raw material quality assessment before equipment sizing is critical — particularly for fly ash-based plants, where ash chemistry (LOI, particle size distribution, pozzolanicity) varies significantly between power stations and even between different storage ponds at the same station. Maruti Hydraulics conducts raw material trials at the Nashik factory before finalising the mix design and equipment specification. Second, plant layout design must account for expansion: even a plant commissioned at 150 CBM/day or 10,000 bricks/shift should be laid out to allow a second production line without major civil reconstruction. Third, SCADA batching and automation significantly reduce operating labour dependency and batch-to-batch quality variation — the incremental cost of SCADA over manual batching is recovered through reduced material wastage and quality rejection rates within 12–18 months in most plants.
If this case study describes a project similar to what you are planning — whether in plant type, capacity range, raw material conditions, or geography — Maruti Hydraulics is your direct contact. The process begins with a technical discussion covering your production target, site conditions, and raw material availability. For most projects, Maruti Hydraulics can provide a preliminary plant layout, equipment list, and indicative quotation within 2–3 business days of receiving basic project details. Reference plant visits to operating customers in the same product category can be arranged for serious investors. All DPR and bank loan documentation support is included at no additional charge for confirmed orders.
Maruti Hydraulics Limited is an ISO 9001:2015 certified manufacturer of AAC block plants, flyash brick machines, dry mortar plants, paver block machines, sandwich panel machines, and Pre-Engineered Buildings (PEB). Founded in 1991 in Nashik, Maharashtra, Maruti Hydraulics has delivered over 200 turnkey construction machinery projects across India and internationally to Nepal, UAE, South Africa, Singapore, Bangladesh, and Sri Lanka. Key differentiators: in-house autoclave fabrication (SAE 516 Gr 70, IBR certified); India's first complete SCADA batching system for AAC plants (2023); first Indian company to commission an AAC plant outside India (Nepal, 2016); and India's largest 1,200 CBM/day AAC plant (2024). Every project is commissioned by a dedicated Maruti Hydraulics engineering team with structured technology transfer to ensure the client operates independently before handover.
Tags: CLC Plant · Affordable Housing · PMAY · Maharashtra
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