本文選題：抹灰砂漿 + 性能��； 參考：《寧夏大學(xué)》2017年碩士論文

【摘要】：隨著當(dāng)代建筑的迅速發(fā)展,抹灰砂漿對和易性、粘結(jié)性及抗裂性的要求越來越高,將各種摻合料摻加到抹灰砂漿中的探究,已成為當(dāng)前研究的熱點(diǎn)。寧夏地區(qū)許多的低品質(zhì)粉煤灰沒有得到充分利用,堆放在灰場,既占用場地又污染環(huán)境。如何有效提高低品質(zhì)粉煤灰的利用率受到關(guān)注。低品質(zhì)粉煤灰摻加到混凝土中的研究取得了可喜成果,如低品質(zhì)粉煤灰可提高混凝土的抗拉和抗折性能,但將低品質(zhì)粉煤灰用于抹灰砂漿的相關(guān)研究較少,抹灰砂漿無筋且強(qiáng)度要求低,將低品質(zhì)粉煤灰用于抹灰砂漿,能夠滿足強(qiáng)度要求,因此本文提出了低品質(zhì)粉煤灰在抹灰砂漿中的研究這一課題,以期有效利用低品質(zhì)粉煤灰,改善抹灰砂漿的性能提供參考依據(jù)。本論文以M15砂漿為研究對象,以水膠比、低品質(zhì)粉煤灰取代率、低品質(zhì)粉煤灰超摻率和木質(zhì)素纖維摻量為因素,設(shè)計(jì)正交試驗(yàn)方案L16(45),探索了低品質(zhì)粉煤灰木質(zhì)素纖維復(fù)合抹灰砂漿性能的研究。試驗(yàn)結(jié)果表明:(1)對于抹灰砂漿的和易性,低品質(zhì)粉煤灰取代率、低品質(zhì)粉煤灰超摻率和木質(zhì)素纖維摻量能夠明顯改善抹灰砂漿的和易性,低品質(zhì)粉煤灰取代率和超摻率可提高砂漿的流動(dòng)性;木質(zhì)素纖維可提高砂漿的保水性。(2)對于抹灰砂漿的力學(xué)性能,低品質(zhì)粉煤灰取代率,對砂漿的強(qiáng)度表現(xiàn)為負(fù)效應(yīng),對抗壓強(qiáng)度和拉伸粘結(jié)強(qiáng)度的影響較大,但對劈裂抗拉強(qiáng)度的影響較小;超摻低品質(zhì)粉煤灰可以增強(qiáng)砂漿的強(qiáng)度,對于抗壓強(qiáng)度和劈裂抗拉強(qiáng)度,合理的超摻能夠補(bǔ)償取代對強(qiáng)度造成的損失;木質(zhì)素纖維良好的保水性和吸水性,能夠增強(qiáng)抹灰砂漿的強(qiáng)度,對拉伸粘結(jié)強(qiáng)度和劈裂抗拉強(qiáng)度的增強(qiáng)效應(yīng)明顯。(3)對于抹灰砂漿的干燥收縮變形,低品質(zhì)粉煤灰取代率和木質(zhì)素纖維能有效抑制砂漿的干燥收縮,超摻低品質(zhì)粉煤灰使砂漿的收縮變形略微增大,但影響不顯著。(4)應(yīng)用最小二乘法建立了各因素對抹灰砂漿的和易性、力學(xué)性能及干燥收縮特性的多元非線性回歸模型,顯著性高,相關(guān)性好。研究結(jié)果對寧夏地區(qū)劣質(zhì)粉煤灰綜合利用,改善抹灰砂漿和易性、粘結(jié)性及抗裂性具有重要的現(xiàn)實(shí)意義。
[Abstract]:With the rapid development of contemporary architecture, the requirements of plastering mortar for easiness, adhesion and crack resistance are becoming higher and higher. The research of adding various admixtures to plastering mortar has become a hot research topic at present.Many of the low quality fly ash in Ningxia are not fully utilized and are stacked in the ash yard, which not only occupies the site but also pollutes the environment.How to effectively improve the utilization ratio of low quality fly ash has attracted much attention.The research of adding low quality fly ash to concrete has achieved gratifying results. For example, low quality fly ash can improve the tensile and flexural properties of concrete, but there is little research on the application of low quality fly ash to plastering mortar.Plastering mortar has no reinforcement and low strength requirement. Using low quality fly ash in plastering mortar can meet the strength requirement. Therefore, the research of low quality fly ash in plastering mortar is put forward in this paper, in order to utilize low quality fly ash effectively.Improving the performance of plastering mortar provides reference basis.In this paper, M15 mortar is taken as the research object, the water / binder ratio, the replacement rate of low quality fly ash, the superaddition rate of low quality fly ash and the content of lignin fiber are taken as the factors.The orthogonal test scheme L1645 was designed to study the properties of low quality fly ash lignin fiber composite plastering mortar.The experimental results show that the compatibility of plastering mortar, the substitution rate of low quality fly ash, the superaddition rate of low quality fly ash and the content of lignin fiber can obviously improve the easiness of plastering mortar.Low quality fly ash substitution rate and superaddition rate can improve the fluidity of mortar, lignin fiber can improve the water-retaining property of mortar, and the mechanical properties of plastering mortar, the substitution rate of low quality fly ash and the strength of mortar are negative effects.The influence on the compressive strength and tensile bond strength is greater, but the effect on the splitting tensile strength is small, the strength of mortar can be enhanced by adding low quality fly ash, but the compressive strength and splitting tensile strength can be enhanced.Reasonable overmixing can compensate for the loss of strength caused by replacement; lignin fiber has good water retention and water absorption, which can enhance the strength of plastering mortar.The strengthening effect on tensile bond strength and splitting tensile strength is obvious. The dry shrinkage deformation of plastering mortar is obvious. The replacement ratio of low quality fly ash and lignin fiber can effectively inhibit the drying shrinkage of mortar.The shrinkage and deformation of mortar is slightly increased by adding super low quality fly ash, but the influence is not significant. (4) the multivariate nonlinear regression model of the various factors for the easiness, mechanical properties and drying shrinkage characteristics of plastering mortar is established by using the least square method.The significance is high and the correlation is good.The results have important practical significance for comprehensive utilization of inferior fly ash, improvement of plastering mortar and easiness, adhesion and crack resistance.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU578.1

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