iv class="navCtrl">
    <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Blog</a></li>
        <li><a href="#">Contact</a></li>
    </ul>
</div>

wp_nav_menu(
        array( 'theme_location' => 'header-menu',
            'menu_class'        => 'navCtrl',
            'items_wrap'        =>  '<ul id="%1$s" class="%2$s">%3$s</ul>'
        )
);

<div class="navCtrl">
    <ul>
        <li class="page_item page-item-11 current_page_item">
            <a href="http://localhost/wordpress/?page_id=11">about</a>
        </li>
        <li class="page_item page-item-13">
            <a href="http://localhost/wordpress/?page_id=13">blog</a>
        </li>
        <li class="page_item page-item-15">
            <a href="http://localhost/wordpress/?page_id=15">contact</a>
        </li>
        <li class="page_item page-item-8">
            <a href="http://localhost/wordpress/?page_id=8">home</a>
        </li>
    </ul>
</div>