用于水泥混凝土路面快速修补的粉煤灰基地聚合物性能研究
发布时间：2018-08-19 09:30
【摘要】：水泥路面是一种常见的路面形式,在现代交通和自然因素的作用下,路面出现裂缝、拱起、破损、断裂等病害。传统的水泥路面修补材料存在耐久性差、造价高、碳排放量大,施工工艺复杂等缺陷。为研制出一种新型的水泥路面修补材料,以粉煤灰为主要原材料,在硅酸钠与氢氧化钠碱性溶液复合激发下,通过添加矿粉与纤维等改性材料,制备出用于水泥路面快速修补的地聚合物净浆与砂浆,探究了组成设计与性能之间的规律。在分析和归纳水泥路面病害成因与治理措施的基础上,对粉煤灰基地聚合物净浆与砂浆的应用性与经济性进行了探究。得出的主要的结论有:1.粉煤灰基地聚合物的性能主要受水胶比、碱激发剂掺量、矿粉取代率和水玻璃模数这四个因素的影响,水玻璃模数的合理取值区间是1.2~1.8,为节约成本,可用水玻璃模数为1.8的碱激发剂制备粉煤灰基地聚合物。水胶比的合理取值是0.28左右,碱激发剂掺量的合理取值是0.14左右。矿粉取代率是影响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应用到水泥路面修补中还有强度富余,因此也可适当提高水胶比,减小碱激发剂掺量,节约成本。2.粉煤灰基地聚合物净浆中添加纤维或丁苯乳液,流动度都会有较小幅度的较低,PVA纤维造成的流动度损失小于PP纤维。纤维对粉煤灰基地聚合物起到促凝作用,而丁苯乳液起到缓凝作用。纤维对抗压强度影响不大,但能显著提升抗折强度与拉伸强度。丁苯乳液会造成抗压强度显著降低,并且造成早期抗折强度与拉伸强度降低,仅提高长期抗折强度。纤维能够改善粉煤灰基地聚合物净浆的耐久性,减小徐变收缩,增强抗冻性,而丁苯乳液起不到相同作用。3.纤维能够显著增强粉煤灰基地聚合物的韧性,并且PVA纤维的增韧效果优于PP纤维,纤维增韧的机理在于两个方面,第一个方面,添加纤维使地聚合物抗折强度提高,另一个方面也是最主要的方面,添加纤维使地聚合物的延性增强,从而韧性得到提高,并且PVA纤维的增韧效果优于PP纤维。丁苯乳液对粉煤灰基地聚合物起不到相同作用。4.为取得较好的流动度与力学强度,粉煤灰基地聚合物砂浆的水胶比和胶砂比这两个组成设计参数的合理取值区间为:水胶比0.4~0.42,胶砂比0.45~0.5。中砂及粗砂的力学强度要高于细砂,技术类别越好,强度越高,粉煤灰基地聚合物砂浆的力学强度受砂的粗细程度与级配综合影响,工程中应选用级配良好的中砂或粗砂配制地聚合物砂浆。5.粉煤灰基地聚合物砂浆可快速达到较高抗压强度,3d抗压强度即可达到35MPa以上,7d抗压强度即可达到50MPa以上,添加PVA纤维对抗压强度影响不大,添加丁苯乳液后,抗压强度较大幅度降低。PVA纤维能够提高粉煤灰基地聚合物砂浆的早期抗折强度、拉伸强度和韧性,但是对长期抗折强度的提升不显著。丁苯乳液能够显著提高粉煤灰基地聚合物砂浆的长期抗折强度。复掺PVA纤维与丁苯乳液,粉煤灰基地聚合物砂浆各龄期的抗折强度、拉伸强度、粘结强度与韧性均提高,合理复掺组成是0.5%体积掺量纤维与8%质量掺量的丁苯乳液。6.粉煤灰基地聚合物砂浆的抗收缩和抗硫酸盐侵蚀性能良好,自身具备较好的耐久性能。添加PVA纤维能够一定程度降低徐变收缩,提升抗冻性。丁苯乳液对粉煤灰基地聚合物砂浆的耐久性能有轻微的负作用,但影响程度微小。7.粉煤灰基地聚合物净浆主要适用于水泥路面裂缝的快速修补,粉煤灰基地聚合物砂浆主要适用于水泥路面的板块局部快速修复与板底注浆快速修复。粉煤灰基地聚合物净浆材料单价约1300元,粉煤灰基地聚合物砂浆材料单价约700元,用于水泥混凝土路面裂缝填封、板块局部修复、混合料修补与板底堵封中,比同类产品经济。
[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.
【学位授予单位】：中国地质大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.216;U418.6
本文编号：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.
【学位授予单位】：中国地质大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.216;U418.6
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