磷建筑石膏基无砂自流平砂浆的制备与性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (4): 1455-1462.

磷建筑石膏基无砂自流平砂浆的制备与性能研究

张兆锐¹, 单俊鸿¹, 王荣荣², 李春², 史圣然¹

1.河北工程大学土木工程学院,邯郸 056038;
2.武汉德毅环保新材料有限公司,武汉 430200

收稿日期:2023-10-18 修订日期:2023-12-07 出版日期:2024-04-15 发布日期:2024-04-17
通信作者: 单俊鸿,博士,教授。E-mail:hopeshan@163.com
作者简介:张兆锐(1999—),男,硕士研究生。主要从事新型土木工程材料方面的研究。E-mail:2492592286@qq.com
基金资助:
中央引导地方科技发展专项资金项目(YDZX20181400002774)

Preparation and Performance of Phosphorus Building Gypsum-Based Sandless Self-Leveling Mortar

ZHANG Zhaorui¹, SHAN Junhong¹, WANG Rongrong², LI Chun², SHI Shengran¹

1. College of Civil Engineering, Hebei University of Engineering, Handan 056038, China;
2. Wuhan Deyi Environmental Protection New Materials Co., Ltd., Wuhan 430200, China

Received:2023-10-18 Revised:2023-12-07 Online:2024-04-15 Published:2024-04-17

摘要/Abstract

摘要： 采用磷建筑石膏、P·O 42.5水泥、粉煤灰、矿粉、石粉及外加剂为原材料制备高强耐水型磷建筑石膏基无砂自流平砂浆。通过正交试验确定砂浆中胶凝材料的最优掺量,研究减水剂和可再分散性乳胶粉对砂浆性能的影响,并采用XRD及SEM对砂浆进行微观分析。结果表明,当磷建筑石膏、水泥、粉煤灰、矿粉及石粉质量比为73 ∶5 ∶5 ∶15 ∶2时,砂浆综合性能最优,28 d绝干抗压强度为33.0 MPa,软化系数为0.774。减水剂能够提高砂浆30 min的流动度、力学性能及耐水性能,但当掺量为0.30%(质量分数)时,会降低砂浆的后期强度。可再分散性乳胶粉会降低砂浆的流动性能及力学性能,但能提升砂浆的耐水性能。制备的磷建筑石膏基无砂自流平砂浆的性能满足《石膏基自流平砂浆》(JC/T 1023—2021)的要求,砂浆的28 d绝干抗折强度、28 d绝干抗压强度分别为12.0、45.9 MPa,软化系数高达0.886,吸水率低至2.8%。

关键词: 磷建筑石膏, 自流平砂浆, 外加剂, 正交试验, 力学性能, 耐水性能

Abstract: This is a technical description about preparing high-strength and water-resistant phosphorus gypsum-based sandless self-leveling mortar by using phosphorus building gypsum, P·O 42.5 cement, fly ash, mineral powder, stone powder, and additives as raw materials. The optimal dosage of cementitious materials in mortar was determined through orthogonal experiments. The effects of water reducer and redispersible latex powder on mortar performance were studied, and microscopic analyses of mortar were conducted using XRD and SEM. The results indicate that when the mass ratio of phosphorus building gypsum, cement, fly ash, mineral powder, and stone powder is 73 ∶5 ∶5 ∶15 ∶2, the mortar shows optimal comprehensive performance. The 28 d absolutely dry compressive strength of mortar reaches 33.0 MPa, with a softening coefficient of 0.774. Water reducer can enhance the liquidity, mechanical properties, and water resistance of mortar within 30 min. However, at a dosage of 0.30% (mass fraction), the water reducer can decrease the mortar's long-term strength. Redispersible latex powder decreases the liquidity and mechanical properties of mortar, but improves its water resistance. The phosphorus gypsum-based sandless self-leveling mortar prepared in this paper meets the requirements of "Gypsum-based self-leveling mortar" (JC/T 1023—2021). The 28 d absolutely dry flexural strength and 28 d absolutely dry compressive strength of mortar are 12.0 and 45.9 MPa, respectively, with a high softening coefficient of 0.886 and a low water absorption rate of 2.8%.

Key words: phosphorus building gypsum, self-leveling mortar, admixture, orthogonal test, mechanical property, water resistance

中图分类号:

TU526

张兆锐, 单俊鸿, 王荣荣, 李春, 史圣然. 磷建筑石膏基无砂自流平砂浆的制备与性能研究[J]. 硅酸盐通报, 2024, 43(4): 1455-1462.

ZHANG Zhaorui, SHAN Junhong, WANG Rongrong, LI Chun, SHI Shengran. Preparation and Performance of Phosphorus Building Gypsum-Based Sandless Self-Leveling Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(4): 1455-1462.

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