By reducing agent with calcium ligno sulphonate and naphthalene superplasticizer contrast, the system of modified lignin calcium sulfonate superplasticizer on durability index mortar impermeability, carbonation resistance and contraction, etc.. The results showed that: adding 0.4% calcium lignosulfonate superplasticizer modified mortar 90d permeability ratio of 220%, 28d carbonation depth of 25.5mm, 180d shrinkage ratio of 86%. Further evaluation revealed through fuzzy math: optimal dosage, the doped modified calcium ligno sulphonate superplasticizer mixed mortar durability is superior to calcium lignosulfonate water reducer and naphthalene superplasticizer. Considering the price and environmental factors, the use of modified lignin calcium sulfonate superplasticizer have greater economic effects and environmental effects in mortar projects. In recent years, due to the decline in premature failure of the durability of concrete projects at home and abroad instance uncommon [1,2], people gradually realize that the "high-strength" is only one aspect of concrete performance, durability and more needs to be valued.
The early 1990s, the United States first proposed the concept of high-performance concrete (HPC), which called for concrete with high strength, high mobility, high durability, with particular emphasis on high durability [3]. Polymerization in aqueous solution, the calcium ligno sulphonate (CL), maleic anhydride esterified with polyethylene glycol 1000 and acrylamide macromonomer, copolymer modified into a new type of calcium lignosulfonate (MCL) superplasticizer . And by infrared spectroscopy and surface tension measured structural parameters of calcium lignosulfonate and modified products; study of modified lignin calcium sulfonate superplasticizer on cement paste fluidity, setting time, compressive strength and water reduction effects; analysis of the modified calcium ligno sulphonate superplasticizer on cement paste enhancement mechanism. The results showed that: MCL, effectively improve the dispersion of lignosulfonate on cement particles, water-reducing effect obviously, water reduction of up to 24.8% in its content is 0.5% of the condition.
CL overcome flash condensate, the final setting retarding and air entraining too big flaw; significantly enhanced strength and hardening cement, especially late strength. Modern concrete calcium ligno sulphonate superplasticizer is an important and indispensable component. Lignin sulfonate and calcium lignosulfonate study. Superplasticizer as after naphthalene, melamine-based, aliphatic amino sulfonate superplasticizer and successful development and production of a new type of superplasticizer, with a low dosage, high water reduction, enhanced the effect is significant, low slump loss, get a smaller impact on the setting time of the engineering respected [1-4].
http://www.xydchem.com/
http://www.xyd-chem.com/
http://www.whxydchem.com/cgi/search-en.cgi?f=news_en2+news_en3+product_en2+product_en3+product_en4&t=main_en&switch1=checked
The early 1990s, the United States first proposed the concept of high-performance concrete (HPC), which called for concrete with high strength, high mobility, high durability, with particular emphasis on high durability [3]. Polymerization in aqueous solution, the calcium ligno sulphonate (CL), maleic anhydride esterified with polyethylene glycol 1000 and acrylamide macromonomer, copolymer modified into a new type of calcium lignosulfonate (MCL) superplasticizer . And by infrared spectroscopy and surface tension measured structural parameters of calcium lignosulfonate and modified products; study of modified lignin calcium sulfonate superplasticizer on cement paste fluidity, setting time, compressive strength and water reduction effects; analysis of the modified calcium ligno sulphonate superplasticizer on cement paste enhancement mechanism. The results showed that: MCL, effectively improve the dispersion of lignosulfonate on cement particles, water-reducing effect obviously, water reduction of up to 24.8% in its content is 0.5% of the condition.
CL overcome flash condensate, the final setting retarding and air entraining too big flaw; significantly enhanced strength and hardening cement, especially late strength. Modern concrete calcium ligno sulphonate superplasticizer is an important and indispensable component. Lignin sulfonate and calcium lignosulfonate study. Superplasticizer as after naphthalene, melamine-based, aliphatic amino sulfonate superplasticizer and successful development and production of a new type of superplasticizer, with a low dosage, high water reduction, enhanced the effect is significant, low slump loss, get a smaller impact on the setting time of the engineering respected [1-4].
http://www.xydchem.com/
http://www.xyd-chem.com/
http://www.whxydchem.com/cgi/search-en.cgi?f=news_en2+news_en3+product_en2+product_en3+product_en4&t=main_en&switch1=checked