磷铝盐相变材料对水泥水化硬化进程的影响规律研究  

Influences of a phospho-aluminate phase change material on hydration and hardening processes of cement

作　　者：高芙蓉[1,2] 姬永生 张忠哲[1,2] 周样梅 薛琦 Gao Furong;Ji Yongsheng;Zhang Zhongzhe;Zhou Yangmei;Xue Qi(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学深地工程智能建造与健康运维全国重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《土木工程学报》2025年第4期37-44,57,共9页China Civil Engineering Journal

基　　金：江苏省基础研究计划自然科学基金——青年基金项目(BK20231078);中央高校基本科研业务费专项资金(2023QN1020)。

摘　　要：为研究磷铝盐相变材料(PCM_(P-Al))对水泥水化硬化进程的影响规律,确定PCM_(P-Al)掺量分别为0%、2.5%、5%、10%和20%时水泥胶砂的抗压强度、24h水化产物和硬化水泥净浆的孔隙结构特征和微观形貌。结合PCM_(P-Al)在水和NaOH溶液的溶解特性,分析PCM_(P-Al)影响水泥水化硬化进程的作用机理。研究结果表明:PCM_(P-Al)不溶于水;但当PCM_(P-Al)加入NaOH溶液时,溶液中形成大量絮状物,甚至溶液整体变为凝胶。水泥浆体呈强碱性,当10%或20%PCM_(P-Al)加入水泥浆体时,PCM_(P-Al)在水泥浆体中形成大量絮凝物直至水泥浆体的溶液变为凝胶,导致浆体的水急剧减少直至完全丧失,进而阻碍水泥颗粒的水化。因此,当PCM_(P-Al)掺量高于10%时,水泥24h水化产物显著减少,硬化水泥净浆的孔隙结构粗大、微观结构疏松多孔、整体性差,水泥胶砂的抗压强度大幅降低。In order to study the influences of a phospho-aluminate phase change material(denoted as PCM_(P-Al))on hydration and hardening processes of cement,the compressive strength and hydration products at 24 h of cement mortar as well as pore structures and microstructural morphologies of hardened paste specimens were determined when PCM_(P-Al)dosage was 0%,2.5%,5%10%and 20%,respectively.Based on solubility of PCM_(P-Al)in water and sodium hydroxide solution,the mechanisms of PCM_(P-Al)affecting hydration and hardening processes of cement were analyzed.Results show that PCM_(P-Al)is insolvable in water,but when PCM_(P-Al)is added to the sodium hydroxide solution,a large amount of flocs are formed and the sodium hydroxide solution even turns into gel.Cement paste is strongly alkaline,and when 10%or 20%PCM_(P-Al)is added to fresh cement paste,a large amount of flocs are produced until cement paste turns into gels,resulting in dramatic reduction or even complete loss of water in fresh cement paste,which may further impede the hydration and hardening processes of cement particles.Hence,when PCM_(P-Al)dosage is higher than 10%,the hydration products of cement at 24 h are significantly reduced,so compressive strength of cement mortar is evidently decreased,due to the large pore structures,loose and porous microstructure,and poor wholeness of hardened cement pastes.

关 键 词：水泥 磷铝盐相变材料 水化产物 孔隙结构 微观形貌 

分 类 号：TU528.1[建筑科学—建筑技术科学]