CAJ | 학술논문

来源于木材、麦草、竹子和蔗渣的木质素磺酸钠与三聚氰胺、甲醛和焦亚硫酸钠合成出磺化木质素三聚氰胺甲醛超塑化剂(LSMF).系统研究了LSMF对砂浆减水率、抗压强度、抗折强度和加速碳化深度等应用性能的影响.结果表明,使用麦草基木质素磺酸钠合成出磺化度3.663mmol/g,特性黏度7.24mL/g的LSMF对砂浆的减水增强性能最好.当LSMF掺量为0.7%时,砂浆减水率为21.1%.硬化砂浆28d加速碳化深度为13mm,空白砂浆为34.5mm.掺加LSMF后,硬化砂浆28d抗压强度和抗折强度分别比空白砂浆提高37%和18%.LSMF超塑化剂为木质素高效利用提供了一种新的思路.
래원우목재、맥초、죽자화자사적목질소광산납여삼취청알、갑철화초아류산납합성출광화목질소삼취청알갑철초소화제(LSMF).계통연구료LSMF대사장감수솔、항압강도、항절강도화가속탄화심도등응용성능적영향.결과표명,사용맥초기목질소광산납합성출광화도3.663mmol/g,특성점도7.24mL/g적LSMF대사장적감수증강성능최호.당LSMF참량위0.7%시,사장감수솔위21.1%.경화사장28d가속탄화심도위13mm,공백사장위34.5mm.참가LSMF후,경화사장28d항압강도화항절강도분별비공백사장제고37%화18%.LSMF초소화제위목질소고효이용제공료일충신적사로.
Lignosulfonate-modified sulfonated melamine formaldehyde resin (LSMF) has been synthesized as a superplasticizer used in mortar, and its effects on the performance of mortar have been systematically investigated. To obtain a new superplasticizer LSMF, lignosulfonates originated from wood, straw, bamboo and bagasse were selected to react with sulfonated melamine formaldehyde through a four-step reaction. The effects of LSMF on the performances of the superplasticized mortar were studied through measuring water-reducing ratio, compressive strength, flexural strength, and accelerated carbonation depth. The result shows that straw-based LSMF with sulfonic group content of 3.663mmol/g and intrinsic viscosity of 7.24mL/g has the best water-reducing and reinforcement effects. When LSMF is used in dosage of 0.7% by weight of cement, water-reducing ratio reaches 21.1 %. Compared with that of the control mortar, compressive strength and flexural strength of the superplasticized mortar increase 37% and 18% at 28d, respectively. The minimum carbonation depth of superplasticized mortar at 28d is 13mm, while that of the control mortar is 34.5mm. This understanding can lead to push forward the utilization of lignin with high efficiency.