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The construction chemicals industry opens September 2026 with five signals that together describe a market bifurcating between volume contraction in China and specification-driven premium growth across the Gulf, North America, and Southeast Asia. China’s cement output contracted again in August, even as PCE monomer producers held offer prices firm into the Golden September peak season. The American Concrete Institute’s first low-carbon concrete code is now reshaping US specification language. A UNIDO-backed workshop in Hanoi has put Vietnam on the LC3 decarbonization map. And Saudi Arabia’s giga-projects are consolidating premium admixture demand around 100-year design life requirements.

China Cement Output Contracts 12 Percent in August as Golden September Demand Recovery Beckons

China’s cement production reached 13,015.06 million tonnes in August 2026, down 12.07 percent year-on-year, bringing cumulative January-August output to 99,002.06 million tonnes, off 10.37 percent from the same period in 2025, according to Cement World data. The decline is uneven: Beijing posted the strongest cumulative gain at plus 17.31 percent, while Fujian Province fell the hardest at minus 29.57 percent. Of 31 provinces, only five recorded cumulative growth.

For additive suppliers, the volume contraction is not the whole story. Mysteel’s weekly cement outflow data shows infrastructure direct-supply volumes down only 7.1 to 9.4 percent year-on-year in August, compared with the 21 to 25 percent declines in total cement outflow, which is weighted by struggling real-estate construction. The structure is “infrastructure strong, real estate weak,” and that structure matters because infrastructure concrete consumes roughly two to three times the polycarboxylate superplasticizer dosage of residential slab concrete.

The policy pivot is now explicit. The July 30 Politburo meeting called for accelerated bond spending and “six networks” infrastructure construction, with the National Development and Reform Commission signaling RMB 7 trillion in potential investment scale. As of July 22, local governments had issued RMB 2.2473 trillion in new special bonds, 51 percent of the annual quota, with August alone planning RMB 628.9 billion in issuance. Q3 special bond supply is entering its peak. September post-monsoon construction catch-up is expected to lift cement outflow 5 to 8 percent month-on-month, with the year-on-year decline narrowing to within 15 percent.

PCE Monomer Holds Firm as SCI99 Maps an Inverted-N H2 Trajectory

East China polycarboxylate superplasticizer monomer held at RMB 8,900-9,100 per metric ton in the week ending August 27, 2026, up 2.86 percent week-on-week from RMB 8,650-8,850 per ton on August 20, according to SCI99 weekly assessments. Ethylene oxide closed at RMB 7,700 per ton, up 1.32 percent. Non-ionic surfactant AEO-9 cleared RMB 13,100-13,300 per ton, up 1.54 percent. Diethanolamine held flat at RMB 8,000-8,200 per ton. Ethylene glycol butyl ether rose 1.89 percent to RMB 10,700-10,900 per ton.

SCI99’s half-year review, published September 1, 2026, frames the H2 outlook as an inverted-N trajectory with prices trending lower than H1. The operating-rate data explains why supply discipline is doing the heavy lifting:

• EO industry: H1 2026 average operating rate 50 percent, down 4 percentage points year-on-year. Co-producing units have been diverting to higher-margin mono-ethylene glycol as East China MEG port inventories sit at multi-year lows.
• PCE monomer: H1 2026 average operating rate 27 percent, down 9 percentage points year-on-year, the steepest cut among downstream chains. Industry losses have normalized as real-estate drag capped demand. Capacity utilization in the latest measured week was 24.04 percent, down 0.36 percentage points.
• Non-ionic surfactant: H1 2026 average 49 percent, down 1 percentage point. Detergent end-markets are steady but offer little incremental growth.
• Ethanolamine: H1 2026 average 80 percent, above year-ago levels, supported by rigid orders.

SCI99 expects September to lift monomer prices on Golden September demand, followed by an October pullback as the National Day holiday curtails downstream operating rates, and then a H2 low into November-December as winter slows terminal construction. Some September cargoes are already sold, and producers are signaling continued price defense.

For buyers, the message is to lock Q4 contracts before the October holiday. Short-cycle spot exposure remains the most vulnerable position as feedstock volatility compounds.

ACI CODE 323-24 Reshapes US Low-Carbon Concrete Specifications

The American Concrete Institute’s ACI CODE 323-24: Low-Carbon Concrete, published in November 2024 and now gaining jurisdictional adoption through 2026, is the first enforceable code framework for reducing embodied carbon in concrete. The code covers cast-in-place concrete with specified compressive strengths between 2,500 and 8,000 psi and uses a carbon budget methodology with a weighted Global Warming Potential (GWP) performance requirement.

Key design features:

• Material-agnostic: The code does not prescribe specific chemistries. Supplementary cementitious materials, novel binders, optimized mix designs, and carbon mineralization are all on the table.
• Tiered compliance: Tier 1 (large projects) requires a weighted GWP at or below 85 percent of the local NRMCA regional benchmark. Tier 2 (medium projects) requires documentation of strategies. Tier 3 (small projects) requires only strategy listing.
• EPD mandate: Product-specific Type III Environmental Product Declarations are required for qualifying materials.
• Regional benchmarks: Appendix A provides GWP benchmarks for eight US regions, ranging from 188 kg CO2e per cubic yard for 2,500-3,000 psi concrete in the South Central region to 373 kg CO2e per cubic yard for 6,000-8,000 psi concrete in the Pacific Northwest.

The code does not operate in isolation. The US General Services Administration’s Inflation Reduction Act low-embodied-carbon material requirements set GWP limits by strength class for federal concrete procurement. Since 46 percent of US cement goes into public construction, per the American Council for an Energy-Efficient Economy, government buyers hold outsized influence over adoption. The market signal is blunt: document lower carbon or risk losing federal work.

The low-carbon concrete market was valued at USD 1.8 billion in 2023 and is projected to reach USD 3.8 billion by 2032 at an 11.3 percent CAGR. Cost premiums of 5 to 15 percent are expected to compress to parity within 3-5 years as production scales.

Vietnam Joins the LC3 Map as UNIDO Convenes Hanoi Workshop

On August 27, 2026, the United Nations Industrial Development Organization, the Vietnam Institute for Building Materials, the Low Carbon Construction Association, the Embassy of Switzerland in Vietnam, and the Vietnam National Cement Association jointly organized a workshop in Hanoi titled “Limestone Calcined Clay Cement (LC3) – Applications and Practices.” The event brought together government agencies, researchers, businesses, and development partners.

Vietnam’s cement industry contributes approximately 16 percent of the country’s total greenhouse gas emissions, against a global average of 7-8 percent for cement, making decarbonization an urgent national priority. LC3, which replaces up to 50 percent of clinker with calcined clay and limestone, can cut CO2 emissions by up to 40 percent versus conventional Portland cement while maintaining performance and durability. The technology emerged from research at the Ecole Polytechnique Federale de Lausanne (EPFL) in Switzerland and can use existing cement production infrastructure, a major advantage for capital-constrained markets.

UNIDO Representative Le Thi Thanh Thao framed LC3 as part of Vietnam’s National Program for Inclusive and Sustainable Industrial Development for 2025-2028 and its net-zero-by-2050 commitment. Hoang Huu Tan, Deputy Director of the Ministry of Construction’s Department of Science, Technology, Environment and Building Materials, called for a comprehensive assessment covering clay availability and quality, calcination and blending technologies, product performance, economic efficiency, technical standards, and market acceptance. Vicat Group’s clay calcination technology was highlighted as a reference case.

For additive suppliers, the Vietnam workshop signals a new specification corridor opening across Southeast Asia. The same PCE dosage uplift (1.5-3.6x versus OPC) that applies to LC3 in other markets will apply here, and the timing aligns with SCG’s June 2026 Cemtech Asia showcase of its own LC3 Structural Cement at the Tha Luang plant in Saraburi, Thailand, which cuts CO2 by 30-40 percent using 40 percent biomass alternative fuels and over 35 percent renewable energy.

Saudi Giga-Projects Anchor Premium Admixture Demand at 100-Year Design Life

Saudi Arabia’s construction chemicals market is valued at USD 1.45 billion in 2026 and is projected to reach USD 2.85 billion by 2035 at a 7.8 percent CAGR, according to MarkWide Research. MarkNtel Advisors offers a more aggressive trajectory: USD 1.021 billion in 2025 to USD 1.782 billion by 2030 at an 11.78 percent CAGR. The gap reflects different base years and scope, but the direction is unambiguous.

The demand driver is the Vision 2030 giga-project portfolio: NEOM (USD 500 billion), the Red Sea Project, Qiddiya, and Diriyah Gate. These projects are not only massive in scale but are designed with 100-year service life requirements, which is reshaping specification language:

• PCE displacement: Polycarboxylate ether superplasticizers are displacing legacy naphthalene and melamine chemistries in NEOM and Red Sea Project specifications, driven by superior slump retention in extreme heat (8-12 hour workability windows for Riyadh metro extensions and Qiddiya foundations).
• Silica fume and metakaolin: High-durability concrete for below-grade and marine structures is integrating silica fume and metakaolin supplementary cementitious materials to meet chloride resistance and 100-year design life thresholds.
• Crystalline waterproofing: Cementitious crystalline admixtures that penetrate concrete capillaries and enable self-healing functionality under hydrostatic pressure above 7 bar are gaining specification traction in critical infrastructure where maintenance access is restricted.
• Single-SKU modular kits: NEOM and Red Sea Project contractors are bundling primer, membrane, and sealant specifications into single-SKU procurement to compress vendor management overhead and accelerate site logistics.
• Embedded supplier personnel: Major contractors are consolidating admixture procurement under single-source technical partnership agreements, with supplier personnel embedded at batching plants for real-time mix optimization. Performance guarantees are replacing traditional material supply contracts.

The Saudi Building Code now references SASO’s 2024 technical regulations for construction chemicals, introducing mandatory factory production control audits and traceability documentation. Waterproofing and repair mortar categories face the steepest compliance ramp, with smaller importers exiting rather than absorbing certification costs.

What This Means for Formulators and Buyers

Three practical priorities emerge from the September 2 data:

1. Audit China exposure by end-use, not by headline volume. The 12 percent cement contraction is a real-estate story. Infrastructure PCE demand is holding up, and Golden September catch-up will lift Q4 volumes. Lock Q4 monomer contracts before the October National Day holiday.
2. Prepare EPD documentation for US federal work. ACI CODE 323-24 and GSA Inflation Reduction Act requirements are converging on mandatory Type III EPDs for concrete mixes. Ready-mix producers without product-specific EPDs will be locked out of federal projects.
3. Build a Gulf specification story. Saudi giga-projects are moving from commodity spot purchasing to embedded technical partnerships. Suppliers that can offer PCE for 100-year design life, crystalline waterproofing for 7+ bar hydrostatic pressure, and single-SKU modular kits will own the NEOM specification conversation through 2030.

At Hosechem, we work with dry-mix mortar producers, concrete admixture formulators, waterproofing contractors, and infrastructure specifiers across APAC, the Middle East, Europe, and the Americas. Our cellulose ether (HPMC, HEMC, HEC), redispersible polymer powder (VAE and VAE-VeoVa), polycarboxylate superplasticizer, and crystalline waterproofing admixture portfolios are designed to be specified into projects that need to meet ACI CODE 323-24 GWP thresholds, Saudi Building Code durability mandates, and LC3-compatible PCE dosage requirements. Contact our technical team to discuss grade selection, formulation support, and supply security for your 2026-2027 production calendar.