Properties of High Strength Concrete with Calcined Diatomaceous Earth as Cement Replacement under Compression

Abstract

In this research, calcined diatomaceous earth from Aceh Besar, Indonesia was used as cement replacement in producing high strength concrete. Four concrete mixtures in which the percentage of cement replacement of 0%, 5%, 10% and 15% by weight were studied. Four cylinder-specimens with 100 mm diameter and 200 mm high were prepared for each mixture. The compression load was applied on the specimens at the age of 28 days until the specimens failed. The mixture without calcined diatomaceous earth was more workable than that with diatomaceous earth. The compressive strength of concrete with diatomaceous earth in this study was almost the same for all mixture. However, those compressive strength was lower than the compressive strength of concrete without calcined diatomaceous earth for about 14.6%. Modulus of elasticity of high strength concrete decreased with increasing of cement replacement percentage.

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

“…Zhang and Huang [3] studied the soil disturbance caused by multi-line tunnel construction in a soft-soil area, and the interaction mechanism for adjacent structures, such as the existing above-crossing and down-crossing subway tunnels. Similarly, there are many cases in which new rail transit undercrosses existing tunnels, which have been studied by many scholars [11][12][13][14][15][16][17][18][19][20][21][22]. For example, Lai et al [23] proposed a new method for predicting the ground settlement caused by double tunnels penetrating the existing tunnel, on the basis of a comprehensive consideration of the coupling effect of the front tunnel, the intermediate soil mass, the back tunnel, and the existing tunnel.…”

Permanent Deformation and Fatigue of Semi Flexible Pavement Incorporating Waste Tire Rubber and Natural Zeolite

“…Most importantly, the presence of WTR can significantly improve the physical properties of asphalt mixtures [2][3][4]. The use of natural pozzolan such as zeolite and diatomite has also intensively studied [5][6][7][8][9][10][11]. Incorporating of waste tire rubber (WTR) as an additive and natural zeolite as cement replacement in semi flexible pavement has shown to increase those parameters [12,13].…”