人民黄河
人民黃河
인민황하
Yellow River
2015年
1期
103-107
,共5页
改性砒砂岩%软化系数%抗压强度%碱激发%矿粉%黄河
改性砒砂巖%軟化繫數%抗壓彊度%堿激髮%礦粉%黃河
개성비사암%연화계수%항압강도%감격발%광분%황하
modified feldspathic stone%water resistant coefficient%compressive strength%alkali-activated%slag%Yellow River
砒砂岩是黄河泥沙的主要来源之一，可通过碱激发的方法将其转变为建筑材料，实现其资源化。在矿粉掺量为20％、氢氧化钠为2％、密度为2．2 g／cm3及含水率为6％的条件下，研究了碱激发改性砒砂岩的软化系数随龄期的变化，并详细研究了氢氧化钠掺量、密度、矿粉掺量对碱激发改性砒砂岩抗压强度的影响。试验结果表明，碱激发改性砒砂岩软化系数随龄期的增长而提高，在矿粉掺量为20％、氢氧化钠为2％、密度为2．2 g／cm3、含水率为6％及龄期为28 d的条件下，改性砒砂岩的软化系数达到0．76（满足工程需求）。矿粉能够显著地提高改性砒砂岩的抗压强度，当矿粉含量为40％、密度为2．2 g／cm3和碱激发剂含量为2％时，改性砒砂岩7 d抗压强度能够达到32 MPa，相对于不加矿粉试样抗压强度提高627％。SEM和XRD分析结果表明，改性砒砂岩的水化产物为凝胶态的物质（C－S－H等），并且改性砒砂岩基体的微裂纹大量减少甚至消失。
砒砂巖是黃河泥沙的主要來源之一，可通過堿激髮的方法將其轉變為建築材料，實現其資源化。在礦粉摻量為20％、氫氧化鈉為2％、密度為2．2 g／cm3及含水率為6％的條件下，研究瞭堿激髮改性砒砂巖的軟化繫數隨齡期的變化，併詳細研究瞭氫氧化鈉摻量、密度、礦粉摻量對堿激髮改性砒砂巖抗壓彊度的影響。試驗結果錶明，堿激髮改性砒砂巖軟化繫數隨齡期的增長而提高，在礦粉摻量為20％、氫氧化鈉為2％、密度為2．2 g／cm3、含水率為6％及齡期為28 d的條件下，改性砒砂巖的軟化繫數達到0．76（滿足工程需求）。礦粉能夠顯著地提高改性砒砂巖的抗壓彊度，噹礦粉含量為40％、密度為2．2 g／cm3和堿激髮劑含量為2％時，改性砒砂巖7 d抗壓彊度能夠達到32 MPa，相對于不加礦粉試樣抗壓彊度提高627％。SEM和XRD分析結果錶明，改性砒砂巖的水化產物為凝膠態的物質（C－S－H等），併且改性砒砂巖基體的微裂紋大量減少甚至消失。
비사암시황하니사적주요래원지일，가통과감격발적방법장기전변위건축재료，실현기자원화。재광분참량위20％、경양화납위2％、밀도위2．2 g／cm3급함수솔위6％적조건하，연구료감격발개성비사암적연화계수수령기적변화，병상세연구료경양화납참량、밀도、광분참량대감격발개성비사암항압강도적영향。시험결과표명，감격발개성비사암연화계수수령기적증장이제고，재광분참량위20％、경양화납위2％、밀도위2．2 g／cm3、함수솔위6％급령기위28 d적조건하，개성비사암적연화계수체도0．76（만족공정수구）。광분능구현저지제고개성비사암적항압강도，당광분함량위40％、밀도위2．2 g／cm3화감격발제함량위2％시，개성비사암7 d항압강도능구체도32 MPa，상대우불가광분시양항압강도제고627％。SEM화XRD분석결과표명，개성비사암적수화산물위응효태적물질（C－S－H등），병차개성비사암기체적미렬문대량감소심지소실。
Feldspathic stone is the main source of the Yellow River sediment. Feldspathic stone when combined with suitable alkali activators can be converted into geopolymer cement to realize the resources utilization of feldspathic stone. This paper studied the water resistance and the change of the water resistant coefficient with the age of Pisha Sandstone after the modified. And also studied the influence of the sodium hydroxide dosage,density of the modified feldspathic stone,slag powder dosage to the compressive strength of the modified feldspathic stone. With 20% slag,2% NaOH and 8% water,the water resistant coefficient of modified feldspathic stone reached 0. 76 at 28 days. With slag content was 40%(by weight),the density of the modified feldspathic stone was 2. 2g/cm3 ,the alkali activator content was 2%,the 7 days compressive strength of the modified feldspathic stone can reach 32MPa. In comparison to samples which had no slag,the 7 days compressive strength increased by 602%. SEM and XRD were used to analysis microscopic morphology and reaction products of the modified feldspathic stone. It found a lot of the amorphous minerals which had gelling properties appeared,and the number of micro cracks in modified feldspathic stone were greatly reduced or even disappeared.
