Overview
Cement retarders are specialized chemical additives that extend the workable time of cement paste by slowing the hydration process. They are critical for projects requiring extended transportation or placement periods, such as large-scale infrastructure or high-temperature environments. These retarders interact with cement phases (C3A, C3S) to temporarily inhibit crystal formation. Common active ingredients include lignosulfonates, sugars, and phosphonates, often blended with water-reducers for synergistic effects.
Physical and Chemical Properties
Retarders exhibit varying physical states – powders for dry-mix applications and liquid formulations for ready-mix plants. Their chemical action is pH-dependent, typically functioning optimally in alkaline cement environments (pH 12-13). Key mechanisms include adsorption onto cement particles and complexation with calcium ions. Performance is influenced by dosage (0.1-1% by cement weight), ambient temperature, and cement composition. Some formulations offer adjustable retardation periods from 2 to 24 hours.
Main Applications
Primary use cases include hot-weather concreting (above 30°C) where rapid setting occurs, and mass concrete pours where thermal cracking risk must be managed. They're essential for slip-form construction and pumped concrete requiring prolonged plasticity. Specialty applications include oil well cementing (deep boreholes) and decorative concrete where surface finishes demand extended working time. Compatibility with other admixtures (superplasticizers, air-entrainers) must be verified through trial mixes.
Safety and Storage
Powdered retarders require PPE (gloves, goggles, N95 masks) during handling due to alkaline dust. Liquid forms should be stored in HDPE containers between 5-40°C to prevent freezing or degradation. Spill management involves containment with inert absorbents (vermiculite). Shelf life is typically 6-12 months for liquids (unopened) and 12-24 months for powders in sealed moisture-proof bags. Always consult SDS for specific product hazards.
B2B Procurement Guide
When sourcing retarders, specify: cement type (OPC, PPC, etc.), required retardation window, and any restrictions (e.g., chloride-free for reinforced concrete). Request technical data sheets with set-time graphs at varying dosages. Bulk purchases (20+ tons) often qualify for 10-15% discounts. Consider logistics – liquid retarders require tankers or IBCs, while powders need moisture-proof packaging. Verify supplier QC certifications (ISO 9001) and batch consistency guarantees.
Related Manufacturers
- 主营：堵漏剂、速凝剂、灌浆料、硫铝酸盐水泥、铝酸盐水泥、高铝水泥、耐火水泥、耐酸水泥、快硬硫铝酸盐水泥、低碱度硫铝酸盐水泥、52.5硫铝酸盐水泥、超细水泥、锚固剂、高铝浇注料、堵漏王、道路修补料、水玻璃、树脂锚固剂、注浆料、速凝剂母料、液体速凝剂、高水注浆料、耐火浇注料、环氧树脂砂浆、耐酸胶泥
- 主营：聚丙烯酰胺、聚合氯化铝、片碱、水泥缓凝剂、纯碱、硫酸亚铁、磷酸、元明粉、乙二醇、工业盐、次氯酸钠
- 主营：优氯净、二萘酚、硫酸锌、封口蜡、甘露醇、水杨酸、硫酸锰、防染盐、正辛烷、牛磺酸、白僵菌、冰醋酸、铵明矾、肉桂醇、碳酸镁、肉桂醛、磷酸铝、戊二醛、沸石粉、硫化钠、硫化钡、硫化钙、氯化锌、黄原胶、磺酸钙
- 主营：硫酸钡、碳酸钙、硅溶胶、苄基胂酸、甲基磺酸、氨基磺酸、正硅酸乙酯、多聚甲醛
- 主营：阻垢剂、消泡剂、反渗透阻垢剂、反渗透清洗剂、除垢剂、植物除臭剂、杀菌灭藻剂
- 主营：防水剂、脱模剂、隔离剂、水泥添加剂、水泥增强剂、缓凝剂、水泥发泡剂、增强剂、发泡剂、补强剂、抗渗保护剂、菱镁延缓剂、建筑发泡剂、石膏增强剂、有机硅防水剂、水性脱模剂、菱镁改性剂、硫镁改性剂、憎水剂、促凝剂、水解树脂增强剂、消泡剂、泡沫剂
- 主营：发泡剂、脱模剂、隔离剂、水泥外加剂、水泥发泡机、石膏缓凝剂、缓凝剂、增强剂、防水剂、改性剂、抗卤剂、防水乳液、轻质土泡沫剂、促凝剂、菱镁改性剂、石膏增强剂、有机硅防水剂、憎水剂、渗透剂、界面剂、抗裂剂、防腐剂、防潮剂、流平剂
- 主营：日本三井甲基丙烯酰胺、十二烷基苯磺酸钠、LAS-90、缓凝减水剂、磺酸钠P-90、2A1、医药级丙二醇、50HB-400、聚醚胺D230、DMP-30、PA-25、445N、散可利CP-5、AMP-95、三洋PEG20000、聚醚胺D2000、亨斯迈D400、50HB260、50HB-660、精炼椰子油、杰克EDTA酸、马石油三乙醇胺、DTPA-5Na、卡波姆U21、3225晶振、巴斯夫CO-40
- 主营：杀菌剂、椰子油、印染剂、缓凝减水剂厂家、阻燃剂、油酸锌、润湿剂、硫酸铯、催化剂、粘合剂、乳化剂、草酸锰、硫酸锂、石英砂、绝缘油、茶皂素、防腐剂、醋酸镁、锂电池、碘化锂、培养基、蒸馏水、硬脂酸、塑化剂、草酸钾、磷酸铁
- 主营：锚固剂、堵漏剂、灌浆料、快水泥、硫铝水泥、高强水泥、专用水泥、快硬水泥、快干水泥、修补料水泥、快硬快凝水泥、双快水泥、道路修补水泥、自流平水泥、工程抢修水泥、低碱度水泥、地铁施工、堵漏王、混凝土材料、促硬速凝剂、欧式构件、UHPC、注浆加固、混凝土膨胀剂
- 主营：纤维素醚、可再分散乳胶粉、淀粉醚、缓凝剂、聚乙烯醇、抗裂纤维、减水剂、预拌砂浆添加剂
- 主营：甘氨酸、水苏糖、阻燃剂、生产缓凝减水剂、胶黏剂、硫酸锌、硫酸锆、硫酸锂、钒酸铋、硫酸锰、梅栲胶、溴氨酸、聚合物、锂电池、牛磺酸、磷酸铁、磷酸铋、磷酸铌、碳酸镁、碳酸镍、肉桂醛、防冻剂、磷酸铝、新癸酸、椰油胺、辛癸醇
- 主营：聚羧酸减水剂、减水剂、石膏砂浆、木质素、木质素磺酸钠、木质素磺酸钙、木质素磺酸盐、混凝土外加剂、萘系减水剂、BYK流平剂、无碱速凝剂、木钠、木钙、羟丙基甲基纤维素
- 主营：菱镁改性剂、石膏发泡剂、石膏增强剂、水泥增强剂、水泥发泡剂、水泥防水剂、水泥脱模剂、建筑防水剂、水性脱模剂、石膏防水剂、石膏脱模剂、硫镁改性剂
- 主营：腻子助剂、瓷砖胶助剂、防水砂浆助剂、缓凝剂、界面剂、自流平助剂、乳胶漆真石漆助剂、固化剂