CIESC Journal ›› 2007, Vol. 58 ›› Issue (9): 2382-2387.
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ZHENG Dafeng, QIU Xueqing, LOU Hongming, YANG Dongjie
Online:
Published:
郑大锋,邱学青,楼宏铭,杨东杰
Abstract:
Calcium lignosulfonate(CLS) was separated by ultrafilter and was characterized with IR spectroscopy.The effects of CLS with different relative molecular masses(M) on the properties (fluidity, fluidity loss, stability, setting time) of the mortar for the shield tunneling method was investigated.The results showed that the effects of CLS3 (the fraction with medium-to-high M) were the most evident.When 0.4% (mass) CLS3 was added, water reduction of the mortar was 9.4%, fluidity was enhanced from 193 mm to 243 mm, relative fluidity loss after 3 h was reduced from 71.6% to 43.0%, and the bleeding after 2 h decreased from 5.1% to 1.0%.Medium-to-high molecular mass of CLS was proposed to modify CLS as the admixture of the mortar for the shield tunneling method.
Key words:
木质素磺酸钙, 相对分子质量, 砂浆, 减水剂
摘要:
在对木质素磺酸钙进行超滤分级,并对其不同相对分子质量(M)的级分进行红外光谱表征的基础上,实验研究了不同M的级分对盾构砂浆工作性能的影响。结果表明,中高M级分对砂浆性能的影响最大,掺量为0.4%(质量分数)时,其减水率达9.4%,砂浆的流动度从193 mm提高至243 mm,3 h内砂浆的流动度损失率由71.6%降为43.0%,2 h内砂浆的泌水率由5.1%下降到1.0%。在实验的基础上,提出了可以通过适当增大M的方法提高木质素磺酸钙的应用性能。
关键词:
ZHENG Dafeng, QIU Xueqing, LOU Hongming, YANG Dongjie. Utilization of calcium lignosulfonate with different molecular masses in mortar for shield tunneling method[J]. CIESC Journal, 2007, 58(9): 2382-2387.
郑大锋, 邱学青, 楼宏铭, 杨东杰. 不同相对分子质量木质素磺酸钙在盾构砂浆中的应用 [J]. 化工学报, 2007, 58(9): 2382-2387.
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https://hgxb.cip.com.cn/EN/Y2007/V58/I9/2382
YOU Xiulan;LIU Zhaofeng;CAO Yutong;HU Zuming
PPTA pulps prepared by semi-continuous direct polycondensation process