TY - JOUR
T1 - Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress
AU - Qu, Z.
AU - Yu, Q.
AU - Brouwers, H.J.H.
PY - 2018/3
Y1 - 2018/3
N2 - The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.
AB - The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.
KW - Ca-Al-NO layered double hydroxides
KW - Long-term chloride diffusion test
KW - Mechanical property
KW - Rapid chloride migration
KW - Tortuosity
KW - Transport property
KW - Ca-Al-NO3 layered double hydroxides
UR - http://www.scopus.com/inward/record.url?scp=85040964816&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2018.01.005
DO - 10.1016/j.cemconres.2018.01.005
M3 - Article
SN - 0008-8846
VL - 105
SP - 81
EP - 90
JO - Cement and Concrete Research
JF - Cement and Concrete Research
ER -