用于水泥混凝土路面快速修補(bǔ)的粉煤灰基地聚合物性能研究
發(fā)布時(shí)間：2018-08-19 09:30
【摘要】：水泥路面是一種常見(jiàn)的路面形式,在現(xiàn)代交通和自然因素的作用下,路面出現(xiàn)裂縫、拱起、破損、斷裂等病害。傳統(tǒng)的水泥路面修補(bǔ)材料存在耐久性差、造價(jià)高、碳排放量大,施工工藝復(fù)雜等缺陷。為研制出一種新型的水泥路面修補(bǔ)材料,以粉煤灰為主要原材料,在硅酸鈉與氫氧化鈉堿性溶液復(fù)合激發(fā)下,通過(guò)添加礦粉與纖維等改性材料,制備出用于水泥路面快速修補(bǔ)的地聚合物凈漿與砂漿,探究了組成設(shè)計(jì)與性能之間的規(guī)律。在分析和歸納水泥路面病害成因與治理措施的基礎(chǔ)上,對(duì)粉煤灰基地聚合物凈漿與砂漿的應(yīng)用性與經(jīng)濟(jì)性進(jìn)行了探究。得出的主要的結(jié)論有:1.粉煤灰基地聚合物的性能主要受水膠比、堿激發(fā)劑摻量、礦粉取代率和水玻璃模數(shù)這四個(gè)因素的影響,水玻璃模數(shù)的合理取值區(qū)間是1.2~1.8,為節(jié)約成本,可用水玻璃模數(shù)為1.8的堿激發(fā)劑制備粉煤灰基地聚合物。水膠比的合理取值是0.28左右,堿激發(fā)劑摻量的合理取值是0.14左右。礦粉取代率是影響粉煤灰基地聚合物性能最主要的因素,合理取值是0.4左右。由于粉煤灰基地聚合物應(yīng)用到水泥路面修補(bǔ)中還有強(qiáng)度富余,因此也可適當(dāng)提高水膠比,減小堿激發(fā)劑摻量,節(jié)約成本。2.粉煤灰基地聚合物凈漿中添加纖維或丁苯乳液,流動(dòng)度都會(huì)有較小幅度的較低,PVA纖維造成的流動(dòng)度損失小于PP纖維。纖維對(duì)粉煤灰基地聚合物起到促凝作用,而丁苯乳液起到緩凝作用。纖維對(duì)抗壓強(qiáng)度影響不大,但能顯著提升抗折強(qiáng)度與拉伸強(qiáng)度。丁苯乳液會(huì)造成抗壓強(qiáng)度顯著降低,并且造成早期抗折強(qiáng)度與拉伸強(qiáng)度降低,僅提高長(zhǎng)期抗折強(qiáng)度。纖維能夠改善粉煤灰基地聚合物凈漿的耐久性,減小徐變收縮,增強(qiáng)抗凍性,而丁苯乳液起不到相同作用。3.纖維能夠顯著增強(qiáng)粉煤灰基地聚合物的韌性,并且PVA纖維的增韌效果優(yōu)于PP纖維,纖維增韌的機(jī)理在于兩個(gè)方面,第一個(gè)方面,添加纖維使地聚合物抗折強(qiáng)度提高,另一個(gè)方面也是最主要的方面,添加纖維使地聚合物的延性增強(qiáng),從而韌性得到提高,并且PVA纖維的增韌效果優(yōu)于PP纖維。丁苯乳液對(duì)粉煤灰基地聚合物起不到相同作用。4.為取得較好的流動(dòng)度與力學(xué)強(qiáng)度,粉煤灰基地聚合物砂漿的水膠比和膠砂比這兩個(gè)組成設(shè)計(jì)參數(shù)的合理取值區(qū)間為:水膠比0.4~0.42,膠砂比0.45~0.5。中砂及粗砂的力學(xué)強(qiáng)度要高于細(xì)砂,技術(shù)類(lèi)別越好,強(qiáng)度越高,粉煤灰基地聚合物砂漿的力學(xué)強(qiáng)度受砂的粗細(xì)程度與級(jí)配綜合影響,工程中應(yīng)選用級(jí)配良好的中砂或粗砂配制地聚合物砂漿。5.粉煤灰基地聚合物砂漿可快速達(dá)到較高抗壓強(qiáng)度,3d抗壓強(qiáng)度即可達(dá)到35MPa以上,7d抗壓強(qiáng)度即可達(dá)到50MPa以上,添加PVA纖維對(duì)抗壓強(qiáng)度影響不大,添加丁苯乳液后,抗壓強(qiáng)度較大幅度降低。PVA纖維能夠提高粉煤灰基地聚合物砂漿的早期抗折強(qiáng)度、拉伸強(qiáng)度和韌性,但是對(duì)長(zhǎng)期抗折強(qiáng)度的提升不顯著。丁苯乳液能夠顯著提高粉煤灰基地聚合物砂漿的長(zhǎng)期抗折強(qiáng)度。復(fù)摻PVA纖維與丁苯乳液,粉煤灰基地聚合物砂漿各齡期的抗折強(qiáng)度、拉伸強(qiáng)度、粘結(jié)強(qiáng)度與韌性均提高,合理復(fù)摻組成是0.5%體積摻量纖維與8%質(zhì)量摻量的丁苯乳液。6.粉煤灰基地聚合物砂漿的抗收縮和抗硫酸鹽侵蝕性能良好,自身具備較好的耐久性能。添加PVA纖維能夠一定程度降低徐變收縮,提升抗凍性。丁苯乳液對(duì)粉煤灰基地聚合物砂漿的耐久性能有輕微的負(fù)作用,但影響程度微小。7.粉煤灰基地聚合物凈漿主要適用于水泥路面裂縫的快速修補(bǔ),粉煤灰基地聚合物砂漿主要適用于水泥路面的板塊局部快速修復(fù)與板底注漿快速修復(fù)。粉煤灰基地聚合物凈漿材料單價(jià)約1300元,粉煤灰基地聚合物砂漿材料單價(jià)約700元,用于水泥混凝土路面裂縫填封、板塊局部修復(fù)、混合料修補(bǔ)與板底堵封中,比同類(lèi)產(chǎn)品經(jīng)濟(jì)。
[Abstract]:Cement pavement is a common form of pavement. Under the influence of modern traffic and natural factors, pavement cracks, arches, damages, breakage and other diseases occur. Traditional cement pavement repair materials have some defects, such as poor durability, high cost, large carbon emissions, and complex construction technology. Coal ash is the main raw material, which is stimulated by sodium silicate and sodium hydroxide alkaline solution. By adding mineral powder and fiber and other modified materials, the geopolymer paste and mortar used for rapid repairing of cement pavement are prepared. The law between composition design and performance is explored. The causes of cement pavement diseases and treatment measures are analyzed and summarized. The main conclusions are as follows: 1. The performance of polymer based on fly ash is mainly affected by water binder ratio, alkali activator dosage, mineral powder substitution rate and sodium silicate modulus. The reasonable value range of sodium silicate modulus is 1.2-1.8. In order to save cost, fly ash base polymer can be prepared by alkali activator with sodium silicate modulus of 1.8. The reasonable value of water binder ratio is about 0.28, and the reasonable value of alkali activator dosage is about 0.14. The replacement rate of mineral powder is the most important factor affecting the performance of fly ash base polymer, and the reasonable value is about 0.4. The application of the material to cement pavement repair also has strong strength. Therefore, the water binder ratio can be appropriately increased, the dosage of alkali activator will be reduced, and the cost will be saved. If the.2. or fly ash base polymer paste is added with fiber or styrene butadiene emulsion, the fluidity will be lower. The fluidity loss of PVA fiber is less than that of PP fiber. The polymer plays a role of coagulation, while the styrene butadiene emulsion plays a retarding effect. The fiber has little effect on the compressive strength, but it can significantly enhance the flexural strength and tensile strength. The styrene butadiene emulsion will significantly reduce the compressive strength and reduce the early flexural strength and tensile strength, and only increase the long-term flexural strength. Fiber can improve the fly ash base. The durability of geopolymer paste decreases, creep shrinkage and frost resistance are enhanced, while styrene butadiene emulsion does not play the same role..3. fiber can significantly enhance the toughness of fly ash base polymer, and the toughening effect of PVA fiber is better than that of PP fiber. The mechanism of fiber toughening is based on two aspects. Increasing strength is another important aspect. Adding fiber to enhance the ductility of geopolymer and improve toughness, and the toughening effect of PVA fiber is better than that of PP fiber. Styrene butadiene emulsion has no effect on fly ash base polymer,.4. has better fluidity and mechanical strength, and fly ash based polymer sand. The reasonable value range of the two design parameters is: water binder ratio 0.4-0.42, cement-sand ratio 0.45-0.5. The mechanical strength of medium sand and coarse sand is higher than that of fine sand. The better the technical category and the higher the strength, the mechanical strength of polymer mortar in fly ash base is affected by the size and gradation of sand. Polymer mortar.5. fly ash base polymer mortar prepared with well graded medium sand or coarse sand can reach higher compressive strength quickly, the compressive strength of 3D can reach more than 35MPa, and the compressive strength of 7D can reach more than 50MPa. Adding PVA fiber has little effect on compressive strength. After adding styrene butadiene emulsion, the compressive strength decreases greatly. It can improve the early flexural strength, tensile strength and toughness of fly ash base polymer mortar, but it has no significant effect on the long-term flexural strength. Styrene butadiene emulsion can significantly improve the long-term flexural strength of polymer mortar with fly ash. The flexural strength of PVA based fiber and styrene butadiene emulsion and fly ash base polymer mortar are different at different ages. The tensile strength, the tensile strength, the bond strength and the toughness are all improved. The reasonable addition of the 0.5% volume volume fiber and the 8% mass added styrene butadiene emulsion.6. fly ash base polymer mortar has good shrinkage resistance and sulfate resistance, and has better durability. Adding PVA fiber can reduce creep shrinkage and enhance the resistance to a certain extent. Freezing, styrene butadiene emulsion has a slight negative effect on the durability of fly ash based polymer mortar, but the degree of impact is small..7. fly ash base polymer paste is mainly suitable for rapid repair of cement pavement cracks. The fly ash based polymer mortar is mainly applied to the rapid repair of the cement pavement plate and the rapid grouting at the bottom of the slab. Repair. Fly ash base polymer mortar material unit price is about 1300 yuan, fly ash base polymer mortar material unit price is about 700 yuan, used for cement concrete pavement crack filling, plate partial repair, mixture repair and plate bottom plugging, more economical than similar products.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U416.216;U418.6
本文編號(hào)：2191255
[Abstract]:Cement pavement is a common form of pavement. Under the influence of modern traffic and natural factors, pavement cracks, arches, damages, breakage and other diseases occur. Traditional cement pavement repair materials have some defects, such as poor durability, high cost, large carbon emissions, and complex construction technology. Coal ash is the main raw material, which is stimulated by sodium silicate and sodium hydroxide alkaline solution. By adding mineral powder and fiber and other modified materials, the geopolymer paste and mortar used for rapid repairing of cement pavement are prepared. The law between composition design and performance is explored. The causes of cement pavement diseases and treatment measures are analyzed and summarized. The main conclusions are as follows: 1. The performance of polymer based on fly ash is mainly affected by water binder ratio, alkali activator dosage, mineral powder substitution rate and sodium silicate modulus. The reasonable value range of sodium silicate modulus is 1.2-1.8. In order to save cost, fly ash base polymer can be prepared by alkali activator with sodium silicate modulus of 1.8. The reasonable value of water binder ratio is about 0.28, and the reasonable value of alkali activator dosage is about 0.14. The replacement rate of mineral powder is the most important factor affecting the performance of fly ash base polymer, and the reasonable value is about 0.4. The application of the material to cement pavement repair also has strong strength. Therefore, the water binder ratio can be appropriately increased, the dosage of alkali activator will be reduced, and the cost will be saved. If the.2. or fly ash base polymer paste is added with fiber or styrene butadiene emulsion, the fluidity will be lower. The fluidity loss of PVA fiber is less than that of PP fiber. The polymer plays a role of coagulation, while the styrene butadiene emulsion plays a retarding effect. The fiber has little effect on the compressive strength, but it can significantly enhance the flexural strength and tensile strength. The styrene butadiene emulsion will significantly reduce the compressive strength and reduce the early flexural strength and tensile strength, and only increase the long-term flexural strength. Fiber can improve the fly ash base. The durability of geopolymer paste decreases, creep shrinkage and frost resistance are enhanced, while styrene butadiene emulsion does not play the same role..3. fiber can significantly enhance the toughness of fly ash base polymer, and the toughening effect of PVA fiber is better than that of PP fiber. The mechanism of fiber toughening is based on two aspects. Increasing strength is another important aspect. Adding fiber to enhance the ductility of geopolymer and improve toughness, and the toughening effect of PVA fiber is better than that of PP fiber. Styrene butadiene emulsion has no effect on fly ash base polymer,.4. has better fluidity and mechanical strength, and fly ash based polymer sand. The reasonable value range of the two design parameters is: water binder ratio 0.4-0.42, cement-sand ratio 0.45-0.5. The mechanical strength of medium sand and coarse sand is higher than that of fine sand. The better the technical category and the higher the strength, the mechanical strength of polymer mortar in fly ash base is affected by the size and gradation of sand. Polymer mortar.5. fly ash base polymer mortar prepared with well graded medium sand or coarse sand can reach higher compressive strength quickly, the compressive strength of 3D can reach more than 35MPa, and the compressive strength of 7D can reach more than 50MPa. Adding PVA fiber has little effect on compressive strength. After adding styrene butadiene emulsion, the compressive strength decreases greatly. It can improve the early flexural strength, tensile strength and toughness of fly ash base polymer mortar, but it has no significant effect on the long-term flexural strength. Styrene butadiene emulsion can significantly improve the long-term flexural strength of polymer mortar with fly ash. The flexural strength of PVA based fiber and styrene butadiene emulsion and fly ash base polymer mortar are different at different ages. The tensile strength, the tensile strength, the bond strength and the toughness are all improved. The reasonable addition of the 0.5% volume volume fiber and the 8% mass added styrene butadiene emulsion.6. fly ash base polymer mortar has good shrinkage resistance and sulfate resistance, and has better durability. Adding PVA fiber can reduce creep shrinkage and enhance the resistance to a certain extent. Freezing, styrene butadiene emulsion has a slight negative effect on the durability of fly ash based polymer mortar, but the degree of impact is small..7. fly ash base polymer paste is mainly suitable for rapid repair of cement pavement cracks. The fly ash based polymer mortar is mainly applied to the rapid repair of the cement pavement plate and the rapid grouting at the bottom of the slab. Repair. Fly ash base polymer mortar material unit price is about 1300 yuan, fly ash base polymer mortar material unit price is about 700 yuan, used for cement concrete pavement crack filling, plate partial repair, mixture repair and plate bottom plugging, more economical than similar products.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U416.216;U418.6
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