本文選題：高水材料　切入點(diǎn)：改性　出處：《工程科學(xué)與技術(shù)》2017年S1期 　論文類型：期刊論文

【摘要】：針對(duì)高水材料強(qiáng)度相對(duì)偏低、成本相對(duì)較高的問題,選取粉煤灰和硅粉兩種材料作為添加劑,對(duì)高水材料進(jìn)行改性研究。設(shè)置添加劑摻量梯度為5%、10%、15%和20%,采用四川大學(xué)電子萬能試驗(yàn)機(jī)和掃描電鏡(SEM)兩種試驗(yàn)設(shè)備,進(jìn)行添加劑對(duì)高水材料力學(xué)性質(zhì)影響試驗(yàn),探究添加劑對(duì)高水材料力學(xué)性質(zhì)及微觀結(jié)構(gòu)的影響。試驗(yàn)結(jié)果表明,添加劑對(duì)高水材料力學(xué)性質(zhì)和微觀結(jié)構(gòu)均有較大的影響:1)摻20%粉煤灰和摻10%硅粉均可使高水材料的抗壓強(qiáng)度提高到0.36 MPa,與未摻添加劑高水材料相比,強(qiáng)度提高了20%,且能有效提高殘余強(qiáng)度。2)添加劑的摻入改變了高水材料鈣礬石晶體的發(fā)育形貌、直徑大小及空間網(wǎng)狀結(jié)構(gòu)的致密程度,主要包括以下兩個(gè)方面:粉煤灰的摻入使晶體形貌由短棒狀發(fā)展為針棒狀,大直徑晶體數(shù)量增多,絨球狀的水化硅酸鈣及未反應(yīng)完的殘留物填充在晶體結(jié)構(gòu)孔隙中,使晶體空間結(jié)構(gòu)更為致密;硅粉的摻入使晶體形貌發(fā)展為枝網(wǎng)狀,水化硅酸鈣數(shù)量增加,起到了充填孔隙和增加晶體交錯(cuò)搭接牢固性的作用,枝網(wǎng)狀的晶體和絨球狀的硅酸鈣共同形成了致密的網(wǎng)狀結(jié)構(gòu)。3)證明了抗壓強(qiáng)度的大小是由晶體形貌、直徑大小、晶體結(jié)構(gòu)的搭接方式及網(wǎng)狀結(jié)構(gòu)的致密性共同影響的。
[Abstract]:Aiming at the problem that the strength of high water material is relatively low and the cost is relatively high, two kinds of materials, fly ash and silica fume, are selected as additives. The modification of high water materials was studied. The effect of additives on the mechanical properties of high water materials was tested by means of electronic universal testing machine of Sichuan University and scanning electron microscope (SEM). The effects of additives on the mechanical properties and microstructure of high water materials were investigated. The addition of 20% fly ash and 10% silica fume can increase the compressive strength of the high water material to 0.36 MPA, compared with the high water material without additive, the additive has great influence on the mechanical properties and microstructure of the high water material, and the addition of 20% fly ash and 10% silica fume can increase the compressive strength of the high water material to 0.36 MPA. The strength of ettringite crystal was increased by 20%, and the residual strength. 2) the addition of additives changed the morphology of ettringite crystal, the diameter of ettringite crystal and the density of space network structure. It mainly includes the following two aspects: the crystal morphology of fly ash is changed from short rod to needle rod, the number of large diameter crystals increases, the suede calcium silicate hydrate and unreacted residue are filled in the pore of crystal structure. With the addition of silica fume, the crystal morphology developed into a branch network, and the amount of calcium silicate hydrate increased, which played the role of filling the pores and increasing the fastness of the crystal staggered and overlapped. It is proved that the compressive strength is influenced by the morphology of the crystal, the diameter of the crystal, the overlap mode of the crystal structure and the density of the mesh structure.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護(hù)國家重點(diǎn)實(shí)驗(yàn)室;四川大學(xué)水利水電學(xué)院;
【基金】：國家自然科學(xué)基金煤炭聯(lián)合基金重點(diǎn)資助項(xiàng)目(51134018;51369001)
【分類號(hào)】：TV41
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本文編號(hào)：1568047