ZHENG Dafeng, QIU Xueqing, LOU Hongming, et al. Utilization of calcium lignosulfonate with different molecular masses in mortar for shield tunneling method[J]. CIESC Journal, 2007, (9): 2382-2387.
ZHENG Dafeng, QIU Xueqing, LOU Hongming, et al. Utilization of calcium lignosulfonate with different molecular masses in mortar for shield tunneling method[J]. CIESC Journal, 2007, (9): 2382-2387.DOI:
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.