摘要
以氯磺酸为磺酸试剂,二氯甲烷为分散剂,制备了磺化纤维素(CS),并对其用作水泥减水剂的性能进行了的研究。结果表明:磺化纤维素减水率随磺酸基取代度增加而增加,当其取代度达到0.872,质量分数为1.0%时测得的水泥砂浆减水率、净浆标准凝结时间和3、7、28 d砂浆强度等各项指标均达到高效减水剂的国标要求,磺化纤维素对水泥还具有一定的缓凝作用。通过SEM,对掺加了磺化纤维素的水泥材料进行了微观结构表征,结果表明:磺化纤维素掺入水泥浆后,由于缓凝作用导致初期水化反应发展缓慢;而经较长时间(如28 d)后硬化水泥结构比基准样密实、强度更高。因此,CS有望成为具有实际应用价值的混凝土高效减水剂。
Sulfonated cellulose（CS）was synthesized by using chlorosulfonic acid（ClSO 3 H）as sulfonating reagent and dichloromethane（CH2CI2） as dispersant.Its performances as water-reducing agent for cement was studied systematically.The results showed that the water reducing ratio of sulfonated cellulose was increased with the degree of substitution（DS）.When the DS reached 0.872 and the mass fraction of CS was 1.0%,the quality indexes tested including the water reducing ratio,the setting time of cement mortar and the compressive strength of morta（r3 d、7 d and 28d） all met the GB requirements of high-range water-reducing agent.In addition,the sulfonated cellulose presents some set-retarding effects.Results of SEM tests showed that the hydration was slow at early days when sulfonated cellulose was mixed into the cement motar.But after a long period of hydration such as 28 days,the structure of the hardened cement mortar became more uniform and compact than that of the control,and the compressive strength was also stronger.Thus,CS had the potential to be developed as high-range water-reducing agent.
出处
《混凝土》
CAS
CSCD
北大核心
2012年第10期74-76,共3页
Concrete
基金
新疆大学校院联合资助项目(XY110111)
新疆大学大学生创新性实验计划项目(XJU-SRT-11006)
关键词
磺化纤维素
取代度
高效减水剂
减水性能
sulfonated cellulose
degree of substitution
high-range water-reducing agent
performance of water-reduction
