吸水树脂集料混凝土的中心质效应研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 1970-1979.

所属专题：水泥混凝土

吸水树脂集料混凝土的中心质效应研究

刘云鹏¹, 彭波¹, 王韶辉², 王发洲¹

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.中国建筑材料联合会,北京 100037

收稿日期:2023-03-13 修订日期:2023-03-13 出版日期:2023-06-15 发布日期:2023-06-25
作者简介:刘云鹏(1986—),男,副研究员。主要从事先进水泥基复合材料的研究。E-mail:liuyunpeng@whut.edu.cn
基金资助:
国家自然科学基金(51972250,51502223)

Study on Centroplasm Effects of SAP Aggregate Concrete

LIU Yunpeng¹, PENG Bo¹, WANG Shaohui², WANG Fazhou¹

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. China Building Materials Federation, Beijing 100037, China

Received:2023-03-13 Revised:2023-03-13 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 本文基于中心质假说,通过测试单个吸水树脂集料(SAP集料)或聚苯乙烯颗粒(EPS集料)的混凝土抗压强度,定量表征了不同颗粒粒径(6~20 mm)SAP集料的正、负中心质效应。结果表明,SAP集料释水对水泥砂浆表现出界面增强的正中心质效应与形成孔洞造成的负中心质效应。提出了SAP集料引入气孔带来负中心质效应的经验公式。随着SAP集料颗粒粒径增加,负中心质效应逐渐增强,同时正中心质效应呈先增强后变弱的趋向。提出了SAP集料在不同水灰比砂浆基体中的“临界尺寸”的概念,临界尺寸与基体的水灰比、养护龄期等因素有关。

关键词: 吸水树脂, 中心质假说, 内养护, 界面过渡区, 力学性能

Abstract: This study quantitatively characterized the positive and negative centroplasm effects of superabsorbent polymer (SAP) aggregate with different particle sizes (6~20 mm) by testing the compressive strength of concrete with single SAP or expanded polystyrene (EPS) aggregate, drawing on the centroplasm hypothesis. The results show that the water release of SAP aggregate exhibits a positive centroplasm effect on cement mortar due to the interfacial enhancement and a negative centroplasm effect due to pore formation. The empirical formula of negative centroplasm effects caused by pores induced by SAP aggregate is proposed. With the increase of SAP aggregate size, its negative centroplasm effect increases, while its positive centroplasm effect increases first and then decreases. The concept of "critical size" of SAP aggregate in mortar with different water-cement ratios is proposed. It is related to the water-cement ratio and the curing age of mortar.

Key words: superabsorbent polymer, centroplasm hypothesis, internal curing, interfacial transition zone, mechanical property

中图分类号:

TU528.2

刘云鹏, 彭波, 王韶辉, 王发洲. 吸水树脂集料混凝土的中心质效应研究[J]. 硅酸盐通报, 2023, 42(6): 1970-1979.

LIU Yunpeng, PENG Bo, WANG Shaohui, WANG Fazhou. Study on Centroplasm Effects of SAP Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1970-1979.

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吸水树脂集料混凝土的中心质效应研究

Study on Centroplasm Effects of SAP Aggregate Concrete

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