Experimental Study on Dynamic Performance of Self-Compacting Lightweight Aggregate Concrete under Compression

Furong Li,Yanli Hu,Zhenpeng Yu

doi:10.1155/2019/5384601

Abstract

In order to study the dynamic characteristics of the self-compacting lightweight aggregate concrete (SCLC) under uniaxial compression, 10 different strain rates (10−5–10−1/s) were set up to examine the uniaxial compressive dynamic performance of ordinary concrete, lightweight aggregate concrete, and SCLC, respectively. The failure modes and stress-strain curves of the samples under different loading conditions were obtained through experiment. The dynamic characteristics of the SCLC were analyzed by comparing the failure modes and testing data under different loading conditions. The following conclusions are drawn: the failure modes of the SCLC belong to destruction of shale ceramsite, which are similar to that of the lightweight aggregate concrete. The peak stress and elastic modulus of the self-compacting lightweight aggregate gradually increase with the increase of the loading strain rate, but the extent of increase of the peak stress is lower than that of the ordinary concrete and lightweight aggregate concrete. Affected by the loading strain rate and the random coupling of concrete, the peak strain of the self-compacting lightweight aggregate shows a relatively discrete changing trend. At the same time, the compressive dynamic performance of the SCLC was analyzed from the perspective of failure mechanism with a quantitative point of view.

Highlights

Self-compacting concrete (SCC) is a rather new kind of concrete compared to other concrete materials
In addition to the advantages of ordinary concrete, SCC has three unique characteristics as follows: first, it can be compacted directly relying on its own weight during the stirring process, without extra vibrating and compacting procedures; second, due to inherent characteristics, SCC can avoid the generation of original defects in the early stage; and third, SCC is able to resist external environmental erosion after hardening [1]. e self-compacting lightweight aggregate concrete (SCLC) refers to the SCC in which lightweight aggregate is used to replace coarse aggregate
10 different strain rates were set up in the literature [11] to comparatively analyze the dynamic characteristics of ordinary concrete and lightweight aggregate concrete; the results indicate that the influence of dynamic rate on lightweight aggregate concrete is more significant than that on ordinary concrete

Summary

Introduction

Self-compacting concrete (SCC) is a rather new kind of concrete compared to other concrete materials. The stress-strain curves of ordinary concrete, lightweight aggregate concrete, and SCLC conform to the basic characteristics of uniaxial compression and exhibit good continuity and smoothness.

Results

Conclusion