模拟国际会议演讲稿

1. Introduction

Thank you very much. Mr. Jiao, for your kind introduction. Ladies and gentlemen, Good afternoon! My name is Lijia, came from Harbin Engineering University. I am honored to have been invited to speak at this conference. Before I start my speech, let me ask a question. Do you know what can affect the properties of foam concrete? Do you think how to reinforced the properties of foam concrete？Most of the investigations on foam concrete in the past have been confined（被限于）to neat cement paste, cement paste with partial replacement with admixtures and to cement–sand mixes.

Today, my topic is about Influence of filler type on the properties of foam concrete. I want to share our interesting research result on reinforced concrete frame with you. The content of this presentation is divided into 4 parts: In section 1, I will introduce what is the foam concrete. In section 2, I will talk about Parameters investigated and mix compositions.In section 3, I will give Effect of water–solids ratio on design density. And finally, I will make a conclusion.

2. Body

Section 1: the foam concrete

Now, I will introduce the foam concrete. Pre-formed(成型的) foam concrete is manufactured（加工）by adding foam, prepared by aerating （充气）a foaming agent solution, to cement paste or cement mortar（灰

浆）. The composition（合成物）, physical properties（性能）and uses of foam concrete were discussed in detail（详细的）by Valore, Short and Kinniburgh, Rudnai and Taylor. Although several investigations have been conducted on the properties of foam concrete, most of them deal with cement–sand mixes, neat cement paste with or without partial replacement（局部替换）using admixtures（掺合料）. Few studies report on the influence of filler type on the properties of foam concrete. By using fly ash（粉煤灰）as filler(fine aggregate细骨料) instead of sand, the high volume（体积）utilization（利用）of fly ash becomes possible可能, thus providing a means of eco-nomic（经济）and safe disposal（处理）of this waste product. Comparison（比较）of strength of air-cured foam concrete made with cement-sand and cement–fly ash for masonry（砌体结构）by Durack and Weiqing show that for products of comparable density（比较密度）, mixes with fly ash as fine aggregate in place of sand gave relatively higher strength.

Section 2: Parameters(参数)investigated and mix compositions（组成成分）

So much for the foam concrete, now I will move on to Parameters(参数)investigated and mix compositions. As the experimental programme(实验程序)was aimed at studying the effect of the fillers on the properties like density（密度）, flow behaviour（流动特性）, water absorption（吸水率）and strength of foam concrete, the following mixes