Open AccessEffect of Nano Compound Addition on the Properties and Microstructure of Cement Mortar with Mixed Fine Recycled Aggregate
Author(s) -
Kanjun Ying,
Shuying Yang,
Tao Meng,
Yuanyuan Li
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/719/2/022074
Subject(s) - microstructure , mortar , materials science , shrinkage , cement , composite material , aggregate (composite) , scanning electron microscope , compressive strength , curing (chemistry) , absorption of water
The high-water absorption and poor mechanical properties of mixed fine recycled aggregate, which will lead to weakened interfacial transition zone (ITZ) between cement paste and aggregate, seriously hinder the recycling of mixed fine recycled aggregate. The effect and enhancement mechanism of nano compound addition (NCA) on the properties and microstructure of cement mortar was studied in this paper. The results indicated that the compressive and bending strength of cement mortar with 100% fine mixed recycled aggregate increased about 10% at most of the curing ages and the shrinkage of cement mortar decreased from 2.5% at 1 day to 21% at 28 days by NCA. Scanning electron microscope (SEM) micro photography indicated that the early hydration rate of cement could be accelerated and the density of cement mortar at late ages may well be increased by NCA.