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一种新型混凝土状态调节剂的制备与性能研究

作者：倪涛1，Serina NG2，汪咏梅2，宋欣2，封柯1

关键字：一种,新型,混凝土,状态,调节剂,的,制备,与,

　
（1.石家庄市长安育才建材有限公司，河北 石家庄  051431；
2.四川砼道科技有限公司，四川 成都  610000）
    摘要：以淀粉为原材料，采用普罗兰酶和α-淀粉酶降解反应得到一种新型混凝土状态调节剂GK－A3。采用红外、核磁以及GPC表征了其分子组成、结构和平均分子质量。结果表明，GK-A3分子结构中含有淀粉的a-D型葡萄糖单元结构，只发生分子链的断裂，未发生六元环断裂，其重均分子质量为10 780 g/mol。采用净浆、混凝土以及温度巡检器测试GK-A3对水泥分散性能、水化反应以及混凝土和易性的影响。结果表明，GK-A3对净浆流动度有一定提高效果，能够提高含粉少的粗砂配制的混凝土的保水性、和易性及硬化后的混凝土强度，而对水泥水化反应不产生缓凝作用。
    关键词：淀粉；降解；混凝土；状态调节剂
    中图分类号：TU528.042        文献标识码：A        文章编号：1001-702X（2023）02-0051-04
 
Preparation and performance of a new modifying agent of the concrete state 
NI Tao1，Serina NG2，WANG Yongmei2，SONG Xin2，FENG Ke1
（1.Shijiazhuang Chang'an Yucai Building Materials Co. Ltd.，Shijiazhuang 051431，China；
2.Sichuan Concrete Road Technology Co. Ltd.，Chengdu 610000，China）
    Abstract：Using starch as raw material，a new modifying agent of the concrete state（named GK-A3） was obtained by the degradation reaction of prolanase and α-amylase. Its molecular composition，structure and average molecular weight were characterized by Infrared，NMR and GPC. The test results show that GK-A3 contains the glucose unit structure of starch，only the molecular chain is broken，and the six-membered ring is not broken，and its weight-average molecular weight is 10 780 g/mol. The effects of GK-A3 on cement dispersibility，hydration reaction and concrete workability were tested by pure paste，concrete and temperature inspector. The test results show that GK-A3 can improve the fluidity of the paste to a certain extent，and can improve the water retention，workability and strength of hardened concrete prepared with coarse sand with less powder，without slowing down the hydration reaction of cement.
    Key words：starch，degradation，concrete，modifying agent