發(fā)布時間：2018-09-13 14:40

【摘要】：固化充填材料在礦井井下采空區(qū)堵漏和密閉墻構(gòu)建方面起到了良好的效果,是防治煤自燃火災(zāi)的主要材料之一。論文圍繞泡沫摻量對固化充填材料的特性影響展開研究,在研究發(fā)泡劑性能和兩種膠凝材料性能的基礎(chǔ)上,實驗研究摻入不同泡沫量的兩種固化充填材料性能,為防治煤自燃的實際應(yīng)用提供了實驗依據(jù)。論文主要開展了以下工作:實驗以復(fù)合發(fā)泡劑作為固化充填材料的泡沫發(fā)泡劑,采用正交實驗優(yōu)選出發(fā)泡條件:1:30發(fā)泡液濃度、50℃發(fā)泡液溫度和0.5m3/h壓縮空氣流量。采用顯微實驗分析泡沫結(jié)構(gòu)隨時間的變化,研究表明隨時間變化泡沫組成由獨立氣泡變?yōu)槎鄽馀萑诤闲螒B(tài),且氣泡直徑變大,氣泡膜變薄。實驗研究了不同水灰比的普通硅酸鹽水泥、硫鋁酸鹽水泥的固化特性。隨著水灰比的增大兩種膠凝材料初、終凝時間、流動度增大黏度減小;硫鋁酸鹽水泥凝結(jié)時間和黏度小于硅酸鹽水泥,流動度大于硅酸鹽水泥。加入泡沫之后,隨著泡沫摻量的增加充填材料初凝時間增大,流動度減小;硫鋁酸鹽充填材料初凝時間小于硅酸鹽水泥,流動度大于硅酸鹽水泥充填材料,隨泡沫摻量的增加兩種固化材料密度減小、氣孔率增大,且硫鋁酸鹽固化材料密度、抗壓強度大于硅酸鹽固化材料,氣孔率小于硅酸鹽固化材料。采用數(shù)碼顯微鏡和XRD、SEM研究了固化充填材料微觀特性。隨著泡沫摻量的增加,材料內(nèi)部孔的直徑變大,且由單獨的球形密閉孔結(jié)構(gòu)變成結(jié)構(gòu)較差、相互貫通的多孔。硫鋁酸鹽水泥在1倍、2倍泡沫摻量時能形成較好的微孔(孔直徑1mm),硅酸鹽固化材料在1倍泡沫摻量時能形成微孔。泡沫摻量的增加并不影響材料的水化進程,但材料水化產(chǎn)物結(jié)晶度降低、形貌變差,且水化產(chǎn)物之間的孔隙變大。
[Abstract]:The solidified filling material is one of the main materials to prevent the spontaneous combustion of coal, which has played a good effect in plugging leakage and building the closed wall in the underground goaf. In this paper, the effect of foam content on the properties of solidified filling materials is studied. On the basis of the study of foaming agent and two kinds of cementing materials, the properties of two kinds of solidified filling materials with different foams are studied experimentally. The experimental basis is provided for the practical application of preventing coal spontaneous combustion. The main work of this paper is as follows: the compound foaming agent is used as foaming agent for curing filling material, and the foaming condition is selected by orthogonal experiment. The concentration of foaming liquid is 50 鈩，

本文編號：2241465