Chatarina, Niken and Putra, Sasana and Karami, Muhammad (2020) Deep-hair-cracks mechanism of rigid pavement in humid tropical weather. IOP Conference Series: Materials Science and Engineering, 857 (012028). pp. 1-6. ISSN 1757-899X

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Abstract

This research aims to find the cause of deep hair crack in the rigid pavement. This research is based on rigid pavement observation in Lampung, Indonesia. Rigid pavement length observed is 39.4 km with four lanes. The length was divided into segments. The measure of every segment is 5m  4.6m. The total segments are 31520 pieces. The thickness of the rigid pavement is 30 cm with a flexural strength of 45 MPa. The base of the rigid pavement is lean concrete with 10 cm depth, with fc’ of 10 MPa. The rigid pavement has contacted with the environment during the first 2 hours because of the made of grooving and cutting. The hair-cracks appear at 2 hours of age on 231 segments or 0.1% of all observed segments. Three core drills were done at the rigid pavement with hair-cracks at the age of 8 months. The depth of the cracks reached 77% of the rigid pavement depth. CH bond is not strong and elastic enough to withstand the tensile stress in the surface, the change of high rate expansion and high rate shrinkage due to Ca2+. It is made hair-cracks appear on the surface. Freshwater, makes the CH leach out, this phenomenon increases the porosity, and decrease concrete ability to sustain shrinkage and triggering the cracks deeper. It is important to minimize the time for concrete to direct contact with the environment right after casting.

Item Type:	Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TE Highway engineering. Roads and pavements T Technology > TH Building construction T Technology > TJ Mechanical engineering and machinery
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Sipil
Depositing User:	Dr Niken Chatarina
Date Deposited:	04 Jun 2020 01:44
Last Modified:	04 Jun 2020 01:44
URI:	http://repository.lppm.unila.ac.id/id/eprint/21722

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