Effects of Sodium Gluconate on the Fluidity and Setting Time of Phosphorus Gypsum-Based Self-Leveling

IF 3.1 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Buildings Pub Date : 2023-12-28 DOI:10.3390/buildings14010089

Xuepeng Shen, Hao Ding, Zhichun Chen, Ying Li, Wenxuan An, Aili Chen, Dongyi Lei, Ying Fang, Dongxu Li

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Abstract

To comprehensively utilize industrial by-products of gypsum while reducing the consumption of natural river sand, this experiment was conducted to prepare gypsum-based sandless self-leveling (PGSL) materials by using phosphorus-building gypsum (PBG) and portland cement (PC) as gelling raw materials with the addition of polycarboxylate superplasticizer (PCE), cellulose ethers (CE), and retarders. However, employing phosphogypsum as the source material results in a significant 30 min fluidity loss in the gypsum-based self-leveling system. Therefore, to enhance the flow characteristics of gypsum self-leveling, sodium gluconate was chosen for usage in this research. The impact of single and compound mixing of protein-based retarder (PR) and sodium gluconate (SG) on gypsum-based sandless self-leveling materials was evaluated in terms of heat of hydration analysis, pore structure, fluidity, strength, and setting time. According to the experimental findings, it was possible to considerably decrease the fluidity loss of gypsum-based sandless self-leveling materials, postpone the setting time, boost strength, and enhance pore structure when combined with 0.4% SG and 0.03% PR.

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葡萄糖酸钠对磷石膏自流平流动性和凝结时间的影响

为了综合利用工业副产石膏，同时减少天然河砂的消耗，本实验以磷石膏（PBG）和硅酸盐水泥（PC）为胶凝原料，添加聚羧酸盐超塑化剂（PCE）、纤维素醚（CE）和缓凝剂，制备了石膏基无砂自流平（PGSL）材料。然而，使用磷石膏作为原材料会导致以石膏为基础的自流平系统在 30 分钟内出现明显的流动性损失。因此，为了提高石膏自流平的流动性，本研究选择使用葡萄糖酸钠。从水化热分析、孔隙结构、流动性、强度和凝结时间等方面评估了蛋白质缓凝剂（PR）和葡萄糖酸钠（SG）的单一混合和复合混合对石膏基无砂自流平材料的影响。实验结果表明，在添加 0.4% SG 和 0.03% PR 的情况下，石膏基无砂自流平材料的流动性损失可大大降低，凝结时间可延长，强度可提高，孔隙结构可改善。

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来源期刊

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

期刊介绍： BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates