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Sep. 28, 2026
Why Does Polycarboxylate Superplasticizer (PCE) Sometimes Not Work? Cement and Clay Compatibility PCE is powerful but sensitive - one dose works here, fails there. Three causes: cement C3A and sulfate, clay in the sand, temperature. Montmorillonite is worst, absorbing the PCE side chains. Diagnose by timing: stiff after mixing, raise the standard reducer; slump loss at 30 min, raise the high slump-retention PCE. Test your own materials.
Sep. 24, 2026
What Is a Concrete Set Retarder? Function, Dosage and When to Use It A concrete set retarder slows cement hydration, keeping concrete workable longer in hot weather, long transport and large pours. This guide explains how retarders work, when to use them, typical dosage (0.05%-0.3% of cement weight), the overdose risk, common types such as sodium gluconate, and how retarders work together with PCE water reducers.
Sep. 23, 2026
Concrete Admixtures: The Complete Guide — Functions, Dosage and When to Use Each Six concrete admixtures covered: PCE water reducers (0.1%-0.5%), high slump-retention PCE for 2-4 h, retarders (0.05%-0.3%), early-strength agents (0.2%-0.5%), air-entraining agents (0.005%-0.05%) and defoamers (0.01%-0.05%). Each entry gives the function, mechanism, dosage and risks. Most mixes combine several - test before every large pour..jpg "Ocean Freight Is High. Powder or Flake: Which Solid Polycarboxylate Superplasticizer (PCE) Should You Choose?")
Sep. 22, 2026
Ocean Freight Is High. Powder or Flake: Which Solid Polycarboxylate Superplasticizer (PCE) Should You Choose? A C50 core-tube job: 500 kg/m3 binder, water-binder ratio 0.31. Flake PCE dose was PC 6010F at 0.24% (1.2 kg/m3) plus PC 6020RT at 0.06% (0.3 kg/m3) - 0.30% total, a 4:1 ratio. Results: 205 mm initial slump, 180 mm after 2 hours, 28-day strength 62.5 MPa, bleeding 0.8%. Flake PCE is about 100% solid, so dosing needs no conversion.
Sep. 21, 2026
Case Study: C50 Concrete with Flake Polycarboxylate Superplasticizer (PCE) and High Slump-Retention Admixture A C50 core-tube job: 500 kg/m3 binder, water-binder ratio 0.31. Flake PCE dose was PC 6010F at 0.24% (1.2 kg/m3) plus PC 6020RT at 0.06% (0.3 kg/m3) - 0.30% total, a 4:1 ratio. Results: 205 mm initial slump, 180 mm after 2 hours, 28-day strength 62.5 MPa, bleeding 0.8%. Flake PCE is about 100% solid, so dosing needs no conversion.
Sep. 20, 2026
How Much Polycarboxylate Superplasticizer (PCE) Do You Need? Dosage for Different Concrete PCE dosage is not fixed. Start at 0.15%-0.40% active PCE by binder weight, then cover what cement C3A, sand clay and temperature consume. Stop at saturation, or bleeding and segregation follow. Stiff at the start means more standard reducer; slump loss after 30 minutes means more slump-retention PCE. PCE flake, 97%-100% active, makes dosing exact.
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