优质减水剂的作用是什么？
TH-928 聚羧酸系高性能减水剂
TH-928聚羧酸系高性能减水剂是目前世界上最前沿、科技含量最高、应用前景最好、综合性能最优的一种混凝土超塑化剂(减水剂)。TH-928聚羧酸系高性能减水剂是羧酸类接枝多元共聚物与其它有效助剂的复配产品。经与国内外同类产品性能比较表明，TH-928聚羧酸系高性能减水剂在技术性能指标、性价比方面都达到了当今国际先进水平。
一、性能特点
1、掺量低、减水率高，减水率可高达45%；
2、坍落度轻时损失小，预拌混凝土坍落度损失率1h小于5%，2h小于10%；
3、增强效果显著，砼3d抗压强度提高50～110％，28d抗压强度提高40～80％，90d抗压强度提高30～60％；
4、混凝土和易性优良，无离析、泌水现象，混凝土外观颜色均一。用于配制高标号混凝土时，混凝土粘聚性好且易于搅拌；
5、含气量适中，对混凝土弹性模量无不利影响，抗冻耐久性好；
6、能降低水泥早期水化热，有利于大体积混凝土和夏季施工；
7、适应性优良，水泥、掺合料相容性好，温度适应性好，与不同品种水泥和掺合料具有很好的相容性，解决了采用其它类减水剂与胶凝材料相容性差的问题；
8、低收缩，可明显降低混凝土收缩，抗冻融能力和抗碳化能力明显优于普通混凝土；显著提高混凝土体积稳定性和长期耐久性；
9、碱含量极低，碱含量≤0.2%，可有效地防止碱骨料反应的发生
10、产品稳定性好，长期储存无分层、沉淀现象发生，低温时无结晶析出；
11、产品绿色环保，不含甲醛，为环境友好型产品；
12、经济效益好，工程综合造价低于使用其它类型产品，同强度条件下可节省水泥15-25%。
二、技术指标
TH-928聚羧酸系高性能减水剂匀质性指标
项 目 指 标
外 观 浅棕色液体
密度（g/ml） 1.09±0.02
固含量（%） 22±2
水泥净浆流动度（基准水泥）（㎜） ≥ 250（W/C=0.29）
pH 6～8
氯离子含量（%） ≤ 0.02
碱含量（Na2O＋0.658K2O）（%） ≤ 0.2
三、使用说明
1、掺量为胶凝材料总重量的0.4%～2.0%，常用掺量为0.4%～1.2%；使用前应进行混凝土试配试验，以求最佳掺量；
2、不可与萘系高效减水剂复配使用，与其它外加剂复配使用时也应预先进行混凝土相容性实验；
3、坍落度对用水量的敏感性较高，使用时必须严格控制用水量；
4、注意混凝土表面养护。
四、适用范围
适用于强度等级为C15~C60及以上的泵送或常态混凝土工程。特别适用于配制高耐久、高流态、高保坍、高强以及对外观质量要求高的混凝土工程。对于配制高流动性混凝土、自密实混凝土、清水饰面混凝土极为有利。
五、包装与储存
1、 TH-928聚羧酸系高性能减水剂为液体产品，采用桶装；
2、 应置于阴凉干澡处储存，避免阳光直射，冬季防止霜冻；
3、 密封保存期为12个月，超期经验证合格后仍可继续使用。
http://www.th-chem.com/03-TH-928.htm
参考文献：山东泰和水处理有限公司
Polycarboxylic Acid Water-Reducing Agent
Polycarboxylic acid water-reducing agent is a kind of concrete superplasticizer with good comprehensive properties and good perspective. It is a composite admixture of polycarboxylate copolymers and other auxiliaries. Compared with other similar products, this product is better in its performance and performance/cost ratio.
Properties:
1. Low dosage and high range of water reduction efficiency. Its water reduction efficiency can be up to 45%;
2. High slump-retaining ability. Slump loss of the concrete is less than 5% in 1h, and less than 10% in 2h.
3. High compressive strengths. It can increase the compressive strengths of concrete by 50-110% in 3 days, 40-80% in 28 days, 30-60% in 90 days;
4. Excellent workability. High ability against bleeding or segregation, low resistance and easy for pumping
5. Suitable bubble content, no bad influence on concrete modulus of elasticity, good freeze resistance;
6. Less than 0.2% alkali content,
7. Nontoxic, no formaldehyde and no pollution;
8. Stable performance, no delamination and no sedimentation for long storage period, no crystallization in low temperature.
9. High compatibility, compatibly with many cement types and mineral admixtures, particularly fit for high durability concrete and self compacting concrete.
Specification:
items index
Appearance light brown liquid
Density (20℃) g/ml 1.09±0.02
Solid content % 22±2
Cement paste fluidity (cement base) (mm) 250（W/C=0.29）
pH 6-8
Chloride % ≤ 0.02
pH value(1％ water solution) 1.5~2.0
Alkali (Na2O+0.658K2O)(%) ≤ 0.2
Usage methods:
1. The dosage is 0.4-2.0% of the cementitious materials by weight, normally 0.4-1.2%. Do concrete mixture tests beforehand.
2. No mixture with naphthalene-base water-reducer. Compatibility tests should be conducted beforehand when mixed with other auxiliaries.
3. Slump retention is sensitive to water, water content should be strictly controlled.
4. Concrete cure should be paid attention to.
Scope of applications:
This product is suitable for pumping or normal concrete engineering of C15-C60, particularly for engineering with high durability, excellent fluidity, strong slump retention ability and excellent aesthetic appearance.For high fluidity, self compacting and as cast finish concrete, this product is a good choice.
Package and Storage:
Liquid, package in barrel, storage for one year in dry and shady place, avoiding frost.
Keywords: superplasticizer,Concrete superplasticizer
Related Products: TH-904 aqueous dispersant
TH-2000 Modified Sodium Polyacrylate
Acrylic Acid/Acrylate/Phosphonic Acid/Sulfosalt Tetra-copolymer (TH-241)
conntact information:
Luan Jing
export@th-chem.com
www.thwater.com
参考文献：Polycarboxylic Acid Water-Reducing Agent
