Study on Combination Use of Polycarboxylate Based Water Reducer and Lignosulphate Based Water Reducer

Abstract:

Using the cement paste fluidity experiment, this paper carried out a comprehensive research on the effect of the binary compound water reducer of polycarboxylate based water reducer (PC) and lignosulphate based water reducer (LS). The results show that for the use of single water reducer,the plasticizing ability of PC was much better than that of LS. In PC, the plasticizing ability of polyether type polycarboxylate based water reducer (POLYETHER) was slightly higher than that of polyester type polycarboxylate based water reducer (POLYESTER); in LS, sodium lignosulphate based water reducer (SLS) was slightly higher than calcium lignosulphate based water reducer (CLS). For the use of compound water reducer, the compounding effect of PC with LS was good, and the compounding proportion had a significant influence on the compounding effect, the more the proportion of PC in the compound water reducer, the better the compounding effect. Regarding the compounding effect, POLYESTER was significantly better than POLYETHER, SLS slightly better than CLS; To explore the working mechanism of the compound water reducer, the adsorption amount of each component water reducer in the binary compound water reducer on the cement particles surface was measured respectively. The results of adsorption amount show that for the use of single water reducer,the adsorption amount of CLS is greater than that of POLYETHER under the same conditions. The adsorption amount of CLS in the use of compound water reducer was less than that in the use of single water reducer, while the adsorption amount of POLYETHER in the use of compound water reducer was more than that in the use of single water reducer.

• Periodical: Advanced Materials Research (Volume 721)
• Pages: 252-257
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.721.252
• Online since: July 2013
• Authors: Dong Lin, Xue Qing Qiu, Zhi Hao Lin
• Keywords: Adsorption Amount, Cement Paste Fluidity, Compounding, Lignosulphate Based Water Reducer, Polycarboxylate Based Water Reducer

References

[1] Naiqian Feng, High Performance Concrete, China Building Industry Press, Beijing, 1995. (in Chinese)

[2] B.G Kim, S. Jiang, C. Jolicoeur, The adsorption behavior of PNS superplasticizer and its relation to fluidity of cement paste, Cement and Concrete Research 2000 (30) 887-893.

DOI: 10.1016/s0008-8846(00)00256-8

[3] C.Jolicoeur, M. A. Simard, Chemical admixtures-cement interactions : phenomenology and physico-chemical concepts, Cement and Concrete Composites1998 (20) 87-101.

DOI: 10.1016/s0958-9465(97)00062-0