Investigation About Evenness and Levelness of Concrete Floor Groundwork

Experiments to measure durability of resin floor coatings against caster-load and thermal-shock were done. Then, in several specimens, resin floor coatings were separated from slabs by loads. At that time, slab surfaces seemed to be broken. And, resin floor coatings were easily separated when surface strength of slab were low.Finally the relation between the amount of loads until separation and surface strength of slab was quantitatively shown. This relation is regarded as one kind of barometers of slab surface quality, which is necessary to construct floors corresponding to quality required from users.

Experimental Investigation About Slab Surface Strength and Durability of Resin Floor Coatings Against Rolling-Load and Thermal-Shock

Yokoyama¹,

Matsushita²,

Yokoi³

2010

Influence of Loads of Lower Limbs During Concrete Finishing Work Upon Slab Flatness

Yokoyama¹,

Takahashi²,

Yokoi³

2010

The purpose of this study is to examine a relationship between loads of lower limbs during concrete finishing work and slab flatness.Experiments were taken with 5 different concretes and forms which were size of 2,700 mm × 3,600 mm. Electromyogram �EMG� signals during work were recorded from 4 muscles of lower limb of skilled laborer and sensory tests about workability were taken. Slab flatness was measured with straightedge method. Results showed that at lower workability concrete, the integrated EMG were greater and slab flatness was low grade. It was suggested that the loads influenced slab flatness.

足触りからみたコンクリート床下地の表面凹凸の評価方法と施工管理指標

Yokoyama

Nakajima

Yokoi

et al. 2017

We present an evaluation method and a construction management index about atness of oor groundwork from a viewpoint of a foot touch. At rst, psychological scales of atness evaluation were constructed by a sensory test. Then, roughness was measured on specimens' footprint areas, and performance value was set to be corresponded with psychological scales. As a result, the evaluation method was completed. This performance value is not easy to measure and manage at every construction site, and there is a wellcommon measurement method to manage floor flatness. So, we considered a quantitative relationship between performance value and management value nally.