Influence of Sodium Gluconate Retarder on the Absorption Characteristics of Polynaphthalene Sulphonate Superplasticizer
Release time:2024-08-09
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- Affiliation of Author(s):
- 材料科学与工程学院
- Journal:
- 第七届水泥与混凝土国际会议论文集
- Key Words:
- 中文关键字：萘系高效减水剂，竞争吸附，缓凝剂，吸附模型，英文关键字：polynaphthalene sulphonate, competitive absorption
- Abstract:
- By using two pastes of cement-water system and fly ash–water system, the influence of sodium gluconate (SG) on the absorption characteristics of polynaphthalene sulphonate superplasticizer (PNS) on the surface of powder particles was investigated. The results show that when PNS not reaching up to saturated dosage, the proper amount of SG can obviously reduce the fluidity loss of the above two pastes, but also reduce the absorption amount of PNS on the surface of particles, and the reducing extent of adsorption amount increases with time. The X-ray photoelectron spectroscopy (XPS) shows that for the cement paste with only PNS, the carbon atomic concentration on the surface of cement particles at the hydration time of 60min is distinctly lower than that at the hydration time of 5min; for the cement paste with SG and PNS, the carbon atomic concentration at 60min is nearly equal to that at 5min. The results indicate that the competing absorption and the influence on the transformation rate of PNS adsorptive styles on cement particle surface based the dynamic absorptive models are an important reason for SG reducing the fluidity loss of the cement paste with PNS and SG.
- Note:
- 伍勇华
- First Author:
- liguoxin,songxuefeng,hetingshu,wuyonghua
- Indexed by:
- Journal paper
- Volume:
- 卷：
- Issue:
- 期：
- Page Number:
- 页：1590-1596
- Translation or Not:
- no
- Date of Publication:
- 2010-05-01