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<p>The rising demand for sustainable and eco-friendly construction materials has paved way for development of lignin based superplasticisers as a substitute for chemical admixtures. Lignosulfonate was derived from eucalyptus wood using sulfite pulping and assessed as a natural superplasticiser for concrete in this study. The performance of admixture based on lignin has been investigated by conducting slump test, compressive strength test, split tensile strength test, water absorption test, EDX and SEM analysis. The optimum dosage of lignosulfonate was determined to be 0.6% by weight of cement, which raises the slump value from 74&#xa0;mm to 76&#xa0;mm and increases the 7-day compressive strength from 27&#xa0;MPa to 34&#xa0;MPa, which is nearly 26%. Better than control concrete. The split tensile strength increased from 2.20&#xa0;MPa to 2.80&#xa0;MPa while water absorption was reduced from 5.7% to 4.8%. Thus it improved durability performance. Based on the SEM analysis, there was a denser and more compact microstructure for lignosulfonate-modified concrete whereas EDX analysis was performed to confirm the uniform elemental distribution in the matrix. When doses were raised higher than the optimum level, they had a reduced performance indicating that there is a limit to saturation. In short, eucalyptus-based lignosulfonate has potential as a low-cost, biodegradable and eco-friendly substitute for synthetic superplasticisers for sustainable construction.</p>

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Behaviour of sulphonated lignin based superplasticizers in cementacious concrete

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • T. JayaKrishna,
  • Giridhar Valikala

摘要

The rising demand for sustainable and eco-friendly construction materials has paved way for development of lignin based superplasticisers as a substitute for chemical admixtures. Lignosulfonate was derived from eucalyptus wood using sulfite pulping and assessed as a natural superplasticiser for concrete in this study. The performance of admixture based on lignin has been investigated by conducting slump test, compressive strength test, split tensile strength test, water absorption test, EDX and SEM analysis. The optimum dosage of lignosulfonate was determined to be 0.6% by weight of cement, which raises the slump value from 74 mm to 76 mm and increases the 7-day compressive strength from 27 MPa to 34 MPa, which is nearly 26%. Better than control concrete. The split tensile strength increased from 2.20 MPa to 2.80 MPa while water absorption was reduced from 5.7% to 4.8%. Thus it improved durability performance. Based on the SEM analysis, there was a denser and more compact microstructure for lignosulfonate-modified concrete whereas EDX analysis was performed to confirm the uniform elemental distribution in the matrix. When doses were raised higher than the optimum level, they had a reduced performance indicating that there is a limit to saturation. In short, eucalyptus-based lignosulfonate has potential as a low-cost, biodegradable and eco-friendly substitute for synthetic superplasticisers for sustainable construction.