Pullout Bond Properties of Grout-Filled Mechanical Splice for Precast Concrete Construction

Abstract

Abstract.A new type of grouting coupler for rebar splicing was fabricated with common seamless steel pipe by cold rolling technique. Seven splice specimens were prepared with the sleeve and tested under pullout load. The test results have shown that given a proper embedded length, the specimens provided good behaviour of which the ultimate tension load exceeded the required loading capacity specified in ACI318 and JGJ107. The pullout behavior of grout-filled pipe splice are influenced by the inner cavity structure of the sleeve.

Grouted Sleeve Connection for Precast Concrete Members

“…[34]. [35], [25] and [21]on the other side after their experiment realized that the expressions In [34] it is also agreed that the nature of the grout-bar bond, sleeve-grout bond and the compressive strength of the grout will have an influence on the tensile performance of the connector. Different setting of the connector will require different embedded length of the bar but the normal sleeve largely used will perform well at the embedded length between 6 and 8 times the bar diameter.…”

“…The performance of the bonding grout with the sleeve depends on the nature of the inner surface of the steel or iron sleeve. Ribbed surfaces provide better bonding than smooth surfaces just like for the surface properties of the bar [24,35]. Better bond performance of ribbed or threaded sleeve inner surface was reported by [26] in his conclusion.…”

“…The Equation (1) also used in [25,34,35] can find the average bond stress when the connector is subjected to a load. P is the force in the bar, 𝜋𝑑 𝑏 is the nominal perimeter of the bar and 𝑙 𝑒 is the embedded length of the bar.…”

“…It was found that bars with a smooth surface have a weak bond with the grout. In an experiment conducted by [35], a specimen with the reinforcement with rough circumference had a good grout bond capacity and failed by bar fracture while the smooth bar failed by bar pull out of the sleeve. The interdependence of bond adhesion of the grout and the bar in relation with the bar's roughness is mentioned as well in [33].…”

“…It is reported that the PC had poor performance in seismic regions and was therefore previously used consciously in seismic regions with a lot of precautions and relatively high risks [11]. The grouted sleeve connection was found through much experimental work to withstand several earthquakes without undergoing any major deformation [35]. The wet connections are more preferred more than the wet in seismic zones because of their ability to allow movements within the connection setting [10].…”