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- W2068578873 abstract "The objective of the work described in this first paper of a series is an investigation of the preparation of a sulfonated esparto grass lignin (SEL) and its behavior as a plasticizing–water-reducing agent for cement–water systems. SEL is prepared by extracting the lignin from the black liquor of a soda esparto grass pulping process and then sulfonating it with a mixture of sodium sulfite and formaldehyde. Analyses and characterization of SEL carried out with high-performance size exclusion chromatography (HPSEC), reversed phase chromatography (RPC), infrared spectrometry and chemical methods show that both the molecular weight average and the combined sulfur content are relatively high. Moreover, HPSEC shows that SEL has a relatively more uniform molecular weight distribution (MWD) than the commercial products obtained from the sulfite wood pulping process. On the other hand, SEL could reduce the water content, improve the workability and compressive strength of mortars. SEL also permits a very low rate of slump loss of cements without excessive extension of the final set time." @default.
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- W2068578873 date "2003-07-01" @default.
- W2068578873 modified "2023-09-27" @default.
- W2068578873 title "Evaluation of the performance of sulfonated esparto grass lignin as a plasticizer–water reducer for cement" @default.
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- W2068578873 doi "https://doi.org/10.1016/s0008-8846(02)01098-0" @default.
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