Accelerator[3]
Overview
Fast-drying accelerators are specialized chemical admixtures designed to shorten the setting time of cementitious materials like concrete or mortar. They are critical in projects requiring rapid strength development, such as tunnel linings, emergency repairs, or cold-weather concreting. These accelerators work by altering the hydration kinetics of cement, promoting faster formation of calcium silicate hydrate (C-S-H) gel. Common formulations include calcium chloride (CaCl₂) for general use or alkali-free alternatives like aluminum salts to reduce corrosion risks. The choice depends on project requirements, climatic conditions, and material compatibility. Modern variants focus on minimizing side effects like shrinkage or alkali-silica reaction (ASR).
Physical and Chemical Properties
Fast-drying accelerators typically appear as fine powders or clear liquids, with solubility varying by chemical base (e.g., NaAlO₂ dissolves readily in water). Their alkaline nature (pH 10–13) requires careful handling to avoid skin irritation. Density ranges from 1.5–2.5 g/cm³ for powdered forms. Key reactions include rapid release of hydroxyl ions, which accelerate cement hydration. Alkali-free formulations reduce efflorescence risks, while chloride-based types may corrode steel reinforcement. Storage stability is generally 6–12 months in sealed containers, but moisture exposure can cause clumping or reduced efficacy.
Main Applications
These accelerators are indispensable in shotcrete applications for underground mining or slope stabilization, where immediate adhesion and strength are crucial. They also optimize precast concrete production cycles by enabling faster mold turnover. In cold climates, they counteract slow hydration rates caused by low temperatures. Specialty uses include marine construction (corrosion-resistant variants) and 3D-printed concrete, where controlled setting is vital for layer adhesion. Dosage typically ranges from 2–8% by cement weight, but exceeding recommended levels can cause brittle fractures or discoloration.
Safety and Storage
Due to high alkalinity, fast-drying accelerators require PPE such as nitrile gloves and goggles to prevent chemical burns. Spills should be neutralized with weak acids (e.g., vinegar) and rinsed thoroughly. Inhalation risks during powder handling necessitate dust masks or mechanical ventilation. Storage demands dry conditions below 30°C (86°F) to prevent caking. Bulk purchases should prioritize moisture-resistant packaging. Disposal must comply with local regulations, as some compositions (e.g., chloride-based) are harmful to aquatic ecosystems.
B2B Procurement Guide
When sourcing fast-drying accelerators, specify cement type (e.g., Portland, sulfate-resistant) to ensure compatibility. Request technical datasheets for setting time reduction benchmarks (e.g., initial set <5 minutes). Bulk buyers should negotiate based on annual volume, with prices commonly ranging $200–$800 per ton. Evaluate suppliers for ISO 9001 certification and batch consistency. Pilot testing is recommended to assess performance under project-specific conditions. For green building projects, prioritize alkali-free or low-carbon footprint options.
Related Manufacturers
- 主营：--
- 主营：挖掘机、链轮组件、飞臂吊、速凝剂、拆缸机、锯齿环、伸缩臂、皮带硫化机、聚能管、临时支护装置、搬运悬浮气垫、搬运坦克车、矿用三轮车、喷射器、船用风机、钻头、钻杆、电液推杆、洗靴机、手拉葫芦、除铁器、管道排渣器、消毒门、静电释放器、定向钻机
- 主营：膨胀剂、覆膜剂、减水剂、速凝剂、凝固剂、修补材料、膨胀水泥、砂浆水泥、速干水泥、建筑水泥、修补砂浆、屋顶水泥、防静电地坪、防碳化涂料、水泥自流平、功能性地坪、无声破碎剂、混凝土早强剂、混凝土添加剂、无收缩灌浆料、液固央混凝土、地面找平机器泵、岩棉专用界面剂、水泥砂浆抗冻剂、早强防冻剂
- 主营：灌浆料、压浆料、丙乳砂浆、重载路面快速修复、聚合物改性水泥砂浆、加固修补砂浆、道路修补料、自流平砂浆、混凝土色差修复剂、轨道胶泥、环氧树脂稀胶泥、环氧腻子、高延性混凝土、粘钢胶、道钉锚固剂、高强耐磨料、环氧修补砂浆、自流平、环氧界面剂、自流平水泥、水泥自流平、混凝土界面剂
- 主营：硫铝酸盐水泥、耐火水泥、铝酸盐水泥、快干水泥、高铝水泥、低碱度硫铝酸盐水泥、高水注浆材料、堵漏王、水不漏
- 主营：血粉 闪蒸血粉、血球蛋白粉、血浆蛋白粉、液体速凝剂、血肽 水解血球蛋白粉、血红素蛋白粉、酶解鸡肝粉、大米蛋白粉、谷氨酸渣、菌体蛋白、赖氨酸渣、膨化羽毛粉、水解羽毛粉、多肽氨基酸原粉、葡萄糖酸钠母液、鸡血粉、闪蒸血粉、降鲜灵、玉米浆、酿酒酵母培养物、膨化大豆粉、肥料级肉粉、蛋壳粉、玉米糖渣、磷酸二氢铝、预糊化淀粉粘合剂
- 主营：涤织物、胶黏剂、膨化剂、速凝剂、软水盐、防冻剂、络合剂、清洗剂、杀虫剂、蜡蜡烛、外加剂、醋酸钠、酸硫铜、磺酸钠、去除剂、洗涤碱、稀释剂、除磷剂、乳胶粉、氧化铝、融雪盐、甲酸钙、导热油、活性炭、元明粉、防腐剂
- 主营：环氧树脂灌浆料、环氧树脂砂浆、环氧树脂胶泥、环氧灌浆砂浆、混凝土色差调整修复剂、聚合物加固修补砂浆、丙乳砂浆、高强无收缩灌浆料、粘钢胶、微膨胀注浆料、高强耐磨料、防碳化涂料、混凝土修补剂、微膨胀水泥、无机注浆料、高延性混凝土、环氧界面剂、混凝土界面剂、混凝土再浇剂
- 主营：次氯酸钠、水玻璃、三氯乙烯、无水亚硫酸钠、硫酸氢钠、焦亚硫酸钠、草酸、乙酸乙酯、六偏磷酸钠、硼砂、液碱、三聚磷酸钠、片碱、磷酸、漂白粉、大苏打、碳酸钾、多聚甲醛、铬酸酐、聚合氯化铝、元明粉、硼酸、氨水、二氯甲烷、四氯乙烯
- 主营：聚合硫酸铁、硫酸铝、无铁硫酸铝、无碱速凝剂、除氟剂
- 主营：抗裂砂浆、混凝土外加剂、高强无收缩灌浆料、混凝土速凝剂、修补砂浆水下不分散絮凝剂、耐酸碱防腐砂浆、混凝土表面增强剂、鹅卵石、防水涂料、防腐涂料、桥梁支座灌浆料、耐酸碱耐腐蚀砂浆、瓷砖胶、混凝土防水剂、混凝土增强剂、水泥自流平砂浆、防水剂、自愈型无机渗透防水剂、水泥基渗透结晶母料、修补料、防腐阻锈剂、长效脱模剂、透水混凝土增强剂、高延性混凝土、环氧树脂修补砂浆
- 主营：水玻璃、陶瓷解胶剂、水煤浆添加剂、混凝土速凝剂、三聚磷酸钠、五水偏硅酸钠
- 主营：氨基磺酸、亚氯酸钠、氨水、速凝剂、液碱、脱硝剂、乙醇、次氯酸钠、无水乙醇、草酸、漂白粉、漂粉精、碳酸氢铵、亚硫酸氢钠、二甲基亚砜、二甲基甲酰胺、硼酸、大苏打、冰醋酸、柠檬酸
- 主营：凡士林、洗衣粉、絮凝剂、混凝土速凝剂、葡萄糖、泡花碱、固化剂、防腐剂、污水处、叶面肥、调节剂、氨基氰、润滑油、柴油车、胺鲜脂、硅酸钠、氯化钾、糖蜜粉、润滑剂、清洗剂、杀虫剂、水溶肥、混凝土、消臭剂、尿素车、醋酸钠
- 主营：硫酸亚铁、聚丙烯酰胺、聚合氯化铝、石灰、活性炭、纯碱、片碱、次氯酸钠、漂白粉、醋酸钠、硫酸铝、焦亚硫酸钠、消泡剂、水玻璃、柠檬酸、葡萄糖
- 主营：高铝水泥、硫铝酸盐水泥、堵漏王、快硬硫铝酸盐水泥、速凝剂、速凝剂母料、液体速凝剂、堵漏剂、低碱度硫铝酸盐水泥、铝酸盐水泥、灌浆料、锚固剂、高铝浇注料、耐火水泥、道路修补料、耐酸水泥、水玻璃、树脂锚固剂、注浆料、高水注浆料、耐火浇注料、52.5硫铝酸盐水泥、环氧树脂砂浆、耐酸胶泥、超细水泥