Page 10 - Seminar Spesifikasi Piawai Geoteknik Section 16

DESCRIPTIONS OF CURRENT SECTION 16:2014

Ref. Standard Specification Content

Specification for
Road Works :

Section 16

16.3 Soil Nailing 16.3.3.1 (c) Only soil nails of more than 12m long shall have rebars spliced or coupled. The

tensile strength of the coupler shall be capable to develop at least 95% of the tensile

strength of the rebar as tested and certified by the manufacturer. Test certificates from

reputable or accredited laboratories approved by the S.O., showing the material's
compliance to the specification, shall be submitted to the S.O. for verification and

approval.

16.3.3.4 (a) The size, shape and length of the sheath to protect the rebar shall be as shown

on the Drawing or as directed by the S.O. The sheath shall consist of HDPE (high density
polyethylene) tube with wall thickness not less than 1.0mm and shall be at least 5mm of

grout cover over the nail rebar within the sheath. The thickness of grout between the

HDPE sheath and the sides of drill hole shall be not less than 25mm. Other important
properties that shall be complied are as follows:-

(i) Tensile strength (BS 2782: part 3, method 320C) > 29MPa

(ii) Softening point (BS 2781: Part 3, method 120A) >110°C
(iii) Environmental stress cracking resistance (ASTM D1693-70): 200 hours (no cracking)

(iv) Hydrostatic pressure resistance (BS 6437): no localized swelling, leaking or weeping