| 1. | The asphalt pavement on cement - bound crushed stones base produces cracks easily so that the structure of pavement is destroyed too early
水泥稳定级配碎石基层沥青路面易产生裂缝，造成路面结构过早破坏。 |
| 2. | The examples of engineering have shown that much concrete is prematurely destroyed for their weak durability , and yet , the first reason for weak durability is cracking and leakage of concrete
工程实例表明，很多混凝土过早破坏的原因是因为耐久性差。然而，混凝土的开裂、渗漏是引起混凝土耐久性不良的最重要因素之一。 |
| 3. | However nowadays problems appear in its durability . the erosion of reinforcement is regarded as the main reason which cause the early destroy in the reinforced concrete construction
现已发现其耐久性出现了种种问题，钢筋腐蚀破坏被确认为是导致钢筋混凝土结构过早破坏的一个最主要的原因，而氯离子的侵蚀则是引起钢筋腐蚀的首要因素。 |
| 4. | Durability of concrete is a serious problem which must be faced in the field of road . the reliability of bridges depends on the durability of concrete to a great extend . many roads and bridges failed at early age because of low durability of concrete
混凝土的耐久性是目前公路界面临的严重问题之一,混凝土的耐久性在很大程度上决定了公路桥梁结构的安全性,其耐久性不足是许多公路桥梁结构过早破坏的主要原因。 |
| 5. | Reinforced concrete structure is a structure form that is most widely applied in engineering . since it is found that the reinforced concrete structure is demolished prematurely because of the corrosion of reinforcement , it becomes a focus to which civil engineering field pays attention generally
钢筋混凝土结构是应用最为普遍、范围最广的结构形式，由于钢筋锈蚀引起钢筋混凝土结构的过早破坏，已成为土木工程界普遍关注的一大焦点。 |
| 6. | As a usually , the designer of concrete structure is often interested in concrete ' s strength . but many steel - concrete structure is usually destroyed because it ' s durability , but not it ' s strength , this made many designers realize the importance of durability
通常情况下，混凝土结构设计者往往只对混凝土的强度特别感兴趣。但是许多钢筋混凝土结构，往往会发生过早破坏，其原因不是由于强度，而是由于耐久性不足。这使得很多设计者意识到耐久性的重要。 |
| 7. | Research results show that the settlements of the road structure mainly come from the consolidation and the accumulative residue settlements under the cyclic loads . excessive uneven settlements will produce the premature failure on the pavement . and few researches on the interaction of pavement and subgrade have been developed at present
研究表明，路面路基结构的沉降变形主要来自地基路堤土层的固结压密沉降和交通荷载反复作用下路面路基各结构层的累积残余变形，路面路基结构发生过大的沉降变形会使路面过早破坏。 |
| 8. | Enormous numbers of material and money have been wasted for the conservation of pavement design or the roads could only be used few years for some designer only know little about rigid - roadbase asphalt pavement . so typical or standard pavement structures are need exactly now to eliminate the random by the way of selecting these structures
其结果是，一些路面设计的过于保守，造成较大的材料和资金浪废，而另一些路面则相反，由于结构设计不合适或半刚性材料层厚度不足而产生过早破坏，也造成很大的经济损失。 |
