TY - JOUR
T1 - Effect of aggregate exposing and curing agent on the performance of exposed aggregate concrete
AU - Shen, Peiliang
AU - Chen, Wei
AU - Lu, Linnu
AU - Geng, Haining
AU - Li, Qiu
N1 - Funding Information:
This work was financially supported by the National “13th Five-Year” Plan for Science & Technology Support of China (No. 2017YFB0310001 ) and the National Natural Science Foundation of China (No. 51772226 , 51272193 , 51372183 and U1305245 ).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/12/15
Y1 - 2017/12/15
N2 - As the most important part of exposed aggregate concrete (EAC), the surface zone usually attracts much attention. This paper presents an investigation on the effect of aggregate exposing and curing agent on the properties and microstructure of EAC by a range of analytical techniques. The results show that a gradual reduction of compressive strength, a significant increase of abrasion resistance, obvious increase of carbonation depth and slight increase of chloride & water permeability are observed when the surface aggregates are exposed. The chloride permeability, water permeability and carbonation depth are reduced, and compressive strength and abrasion resistance of EAC are significantly enhanced by applying the curing agent. The microhardness of surface zone around aggregate is lower than that of matrix after aggregate exposing, but can be significantly increased by curing agent. The surface zone is deteriorated after exposing aggregate, but the surface zone and near-surface zone become denser after applying the curing agent. The curing agent penetrates into the concrete by 4–5 mm and reacts with hydration products. The mechanical properties and durability of EAC are improved due to the increase of hydration degree and formation of new products such as CaSiO3 by application of curing agent.
AB - As the most important part of exposed aggregate concrete (EAC), the surface zone usually attracts much attention. This paper presents an investigation on the effect of aggregate exposing and curing agent on the properties and microstructure of EAC by a range of analytical techniques. The results show that a gradual reduction of compressive strength, a significant increase of abrasion resistance, obvious increase of carbonation depth and slight increase of chloride & water permeability are observed when the surface aggregates are exposed. The chloride permeability, water permeability and carbonation depth are reduced, and compressive strength and abrasion resistance of EAC are significantly enhanced by applying the curing agent. The microhardness of surface zone around aggregate is lower than that of matrix after aggregate exposing, but can be significantly increased by curing agent. The surface zone is deteriorated after exposing aggregate, but the surface zone and near-surface zone become denser after applying the curing agent. The curing agent penetrates into the concrete by 4–5 mm and reacts with hydration products. The mechanical properties and durability of EAC are improved due to the increase of hydration degree and formation of new products such as CaSiO3 by application of curing agent.
KW - Durability
KW - Interfacial transition zone
KW - Mechanical properties
KW - Microhardness
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=85029361696&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2017.09.028
DO - 10.1016/j.conbuildmat.2017.09.028
M3 - Journal article
AN - SCOPUS:85029361696
SN - 0950-0618
VL - 156
SP - 675
EP - 683
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -