不同pH值碱性电解水对砂浆工作性能和强度的影响  

Influence of Alkaline Electrolyzed Water with Different pH Values on Workability and Strength of Mortar

作　　者：谢子茜 刘桂宾 张天宇 李秋义 王亮 XIE Zixi;LIU Guibin;ZHANG Tianyu;LI Qiuyi;WANG Liang(School of Civil Engineering,Qingdao Agricultural University,Qingdao 266109,China;Qingdao Qingjian New Material Group Co.,Ltd.,Qingdao 266108,China;School of Civil Engineering,Qingdao Technological University,Qingdao 266103,China)

机构地区：[1]青岛农业大学建筑工程学院,青岛266109 [2]青岛青建新型材料集团有限公司,青岛266108 [3]青岛理工大学土木工程学院,青岛266103

出　　处：《硅酸盐通报》2021年第11期3702-3711,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51808310,52078261,51878366);山东省自然科学基金(ZR2019PEE007,ZR2020ME036)。

摘　　要：碱性电解水具有强碱性、高活性、离子性和吸附性等优点,本文利用不同pH值(9.5、10.5、11.5)的碱性电解水制备粉煤灰砂浆,并在粉煤灰取代率为0%、15%及30%(质量分数)的条件下,系统研究了不同pH值碱性电解水对粉煤灰砂浆的工作性能、力学性能以及Ca(OH)_(2)等水泥水化产物含量的影响规律,并利用XRD、SEM等微观试验对比分析了不同pH值的粉煤灰净浆的结构组成和微观形貌特征。试验结果表明:随着pH值的提高,相较于普通自来水粉煤灰砂浆,碱性电解水粉煤灰砂浆的流动度、抗压强度和抗折强度逐渐提高,水化产物Ca(OH)_(2)含量逐渐降低。当碱性电解水pH值为10.5,粉煤灰取代率为15%时,碱性电解水粉煤灰砂浆的早期强度和流动度的改善效果达到最佳,28 d的抗压强度和抗折强度较普通水砂浆分别提高了8.4%和12.5%。同时,相较于普通自来水净浆,不同pH值的碱性电解水净浆的团簇化和颗粒化均表现得更加明显,这对于促进水泥水化进程,提高砂浆流动性,激发粉煤灰早期活性起到了积极作用,除了生成更多的C-S-H凝胶体和Ca(OH)_(2)等水化产物以外,还生成了钾长石等其他水化产物。Alkaline electrolyzed water has the advantages of strong alkalinity,high activity,ionicity and adsorption.In this study,alkaline electrolyzed water with different pH values(9.5,10.5,11.5)was used to prepare fly ash mortar,under the conditions of 0%,15%and 30%(mass fraction)replacement rate of fly ash,the influence of alkaline electrolyzed water with different pH values on the workability,mechanical properties and the Ca(OH)_(2) content of cement hydration products of fly ash mortar was systematically studied.And the structure composition and micro morphology of fly ash paste with different pH values were compared and analyzed by XRD,SEM and other microscopic tests.The test results show that compared with fly ash mortar with ordinary tap water,with the increase of pH value,the fluidity,compressive strength and flexural strength of alkaline electrolyzed water fly ash mortar gradually increase,and the content of hydration product Ca(OH)_(2) gradually reduces.When the pH value of alkaline electrolyzed water is 10.5 and the fly ash replacement rate is 15%,the improvement effects of the early strength and fluidity of alkaline electrolyzed water fly ash mortar reach the best,and compared with ordinary tap water mortar,the compressive strength and flexural strength at 28 d increase by 8.4%and 12.5%,respectively.At the same time,compared with ordinary tap water fly ash-cement paste,the clustering and granulation of alkaline electrolyzed water fly ash-cement paste with different pH values are more obvious,which can play a positive role to promote the cement hydration process,improve the fluidity of the mortar,and stimulate the early activity of fly ash.In addition to generating more hydration products such as C-S-H gel and Ca(OH)_(2),other hydration products such as potassium feldspar are also generated.

关 键 词：碱性电解水 粉煤灰砂浆 力学性能 PH值 水化产物 

分 类 号：TU525[建筑科学—建筑技术科学]