摘要
为了解决市场上现有化学固沙剂存在的抗水性相对较差、固沙效果不理想等问题,通过在水玻璃中加入一些有机和无机改性材料,制备了一种具有高强度、耐久性和稳定性的新型复合固沙剂,研究了水玻璃浓度、不同改性剂添加量对其性能的影响。结果表明:1)按照水玻璃模数为3.0,改性剂四硼酸钠、碳酸锂、山梨醇、聚丙烯酰胺的添加量(占水玻璃质量的百分比)分别为1.5%、2.5%、0.2%、0.3%,助黏剂羧甲基纤维素钠的添加量为0.3%配置的新型改性水玻璃固沙剂,对沙土固化层的强度可达14.1 MPa;2)新型改性水玻璃固沙剂稳定性和耐久性优良,经70℃高温和-20℃低温7 d老化后,无侧限抗压强度损失率分别为11.8%和19.5%,在700℃高温条件下质量损失率仅为8.6%;3)新型改性水玻璃固沙剂的固沙效果良好,固结层在风速≤20 m/s的净风条件下表现为无风蚀或轻微风蚀,在含沙气流冲击下风蚀量较净风条件下略有增加。
In order to solve the issues of relatively poor water resistance and unsatisfactory sand-fixing effect of existing chemical sand-fixing agents in the market,some organic and inorganic modified materials were added into water glass,a new type of composite sand-fixing agent with high strength,durability and stability was prepared.The results show that:a)According to the modulus of sodium silicate is 3.0,the addition of sodium tetraborate,lithium carbonate,sorbitol and polyacrylamide are 1.5%,2.5%,0.2%and 0.3%respectively,and the addi-tion of sodium carboxymethyl cellulose is 0.3%,the strength of the sand-fixing layer can reach 14.1 MPa.b)The new modified sodium sili-cate sand-fixing agent has good stability and durability.After aging at 70℃high temperature and-20℃low temperature for 7 days,the loss rates of unconfined compressive strength are 11.8%and 19.5%respectively,at 700℃,the mass loss rate is only 8.6%.c)The sand-fixing effect of the new modified sodium silicate sand-fixing agent is good.The sand-fixing layer shows no or slight wind erosion when the wind speed is less than 20 m/s.
作者
李凯崇
薛春晓
杨柳
LI Kaichong;XUE Chunxiao;YANG Liu(College of Resource and Environmental Engineering,Tianshui Normal University,Tianshui 741000,China;Northwest Research Institute Co.,Ltd.,CREC,Lanzhou 730000,China;College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China)
出处
《人民黄河》
CAS
北大核心
2024年第7期119-123,147,共6页
Yellow River
基金
甘肃省2016年工业转型升级专项资金资助项目(甘财经[2016]212号)。
关键词
化学固沙剂
水玻璃
改性剂
抗压强度
风蚀率
chemical sand-fixing agent
water-glass
modifier
compressive strength
wind erosion rate
