外文翻译--低成本防水材料的制备(编辑修改稿)

外文翻译--低成本防水材料的制备(编辑修改稿)内容摘要：

to continue stirring the blend until it is about to be used. Citric acid is mixed with asphalt at diferent weight percentages(10％ ,20％ ,amp。 30％ )for 7 min at temperature of 160 177。 5 ℃ to produce an economically mastic,water proofing and damp proofing asphalt modified binders are thus performed from the virgin asphalt. The Starch jpint sealant samples are prepared in the following procedure。 A 20％ citric acid modified asphalt that ply with the physical requirements of asphalt mastic(ASTM D491)is heated to the desired temperature in a three,neck flask provided with stirrer and contact temperature is held constant by an automatic control system while stirring starch iS dispersed into the citric acid modified asphalt by using hot water(60177。 1℃ ).The resultant asphalt is then bined with citric acid modified asphalt is treated with different percentages of starch(10,30,and 50 wt％ of virgin asphah)and one percentage of calcium carbonate filler (125 wt％ of virgin asphalt).The best results are achieved when the blending temperature is maintained above about 160℃ (as shown in ). 1Expermintal 1Asphalt cement The test is conducted on asphalt cement according to ASTM[1].The result of these tests are listed in . 2 Stone aggregates are crushed and mineral filler obtained by passing the crushed stone through a 200 mesh chemical and physical properties of filler are reported in . 2． 1． 3 Starch Starch has a chemical unit[C6H10O5]n=1001000 and purity of ％ .The position of starch is reported in . 2． 1． 4 Citric acid Citric acid,with an average partical size of 100 mesh,is a white powder material having purity of ％ . 2． 2 Tests of Samples A series of conventional tests which are still in use throughout the world are carried out in the asphalt industry to characterize the mixtures designed for different percentages of cetric acid according to ASTM[1]. These tests include： 1． Peration test。 ASTM D5. 2． Ductility test。 ASTM D1 l3. 3． Softening point test。 ASTM D36. 4． Solubility test。 ASTM D2042。 and 5． Compatibility test。 ASTM D4124. Weather,the following tests are carried out on starch ioint sealant samples according to ASTM [1]methods. 1． Peration test before and after aging。 ASTM D5. 2． Softening point test。 ASTM D36. 3． Flow test。 ASTM D1191. 4． Recovery test before and after aging。 ASTM D5329. 5． Flexibility test。 ASTM D5329. 6． Compatibility test。 ASTM D5329. 7． Density test。 ASTM D70. 8． Tensile adhesion。 ASTM D4l2 Die C. 9． Chemical resistance。 ASTM D147. 10． Fuel resistance。 ASTM D3569. A descfi btion of some of ioint sealant tests are in the following paragraphs: 2． 2． 1Tensile adhesion to concrete Nine specimens of each mixture are prepared to determine the tensile properties using Materials Testing System (MTS一 810).Specimens are divided into three first group placed in water bath at 25 ℃ ,and then loaded at a ratio of 12． 7 mm/ second group is cured in a cooling room maintaining a temperature of19 ℃ for more than 3 h， and then loaded at a ratio of mm/ third group is immersed in benzene solvent for 4 h,and then loaded at a ratio of mm/min,and the stress and elongation values are adhesion test results are summarized in . 2． 2． 2 Chemical(Alkali and acid) resistance test Two groups of starch joint sealant samples are subjected to alkali and acid resistance test in accordance with ASTM first group is placed in 40 percent NaOH at 21℃ solution for 1000 second group is immersed in 95 percent Hcl at 21℃ solution for 1000 samples are then brought toweight loss determination as designated as alkali and resistance test results are summarized in . 2． 2． 3 Z resistance test Three groups of starch ioint sealan t samples are tested for fuel resistance in accordance with ASTM first group is immersed in JP4 fuel bath at 40177。 1℃ for 24 second group is placed in hydraulic bath at 25177。 1℃ for third group is immersed in glycol/water(50/50) bath at 25177。 1℃ for samples are then brought to weight loss determination as designated as resistance test results are summarized in . Results and Discussion The physical and chemical properties of citric acidasphalt binders are evaluated and the results are presented in results indicate。