កត្តាកំណត់អាយុកាលផ្លូវថ្នល់

Durability and Thickness

1. ASPHALT :The type of underlying soil and type of vehicles that will use it dictate the thickness. Most driveways of this type range from four to six inches (10 cm to 15 cm)
2. CONCRETE: A minimum thickness of four inches is necessary. An additional inch will increase load carrying capacity by 50 percent, but it will increase cost by 20 percent. It’s easier to determine load capacity for concrete.

អាយុកាលនៃការប្រើប្រាស់ផ្លុវថ្នល់ ត្រូវបានគេសិក្សាយ៉ាងលំអិត។ ខាងក្រោមនេះជាការដកស្រង់ចេញពីការសិក្សាមួយនៅះអាហ្រិក ទាក់ទងនឹង អាយុកាលខ្លី ឬ វែងនៃការប្រើប្រាស់ផ្លូវថ្នល់ ដោយសារធ្វើកម្រង សំណួរបែប Quantitative/Questionnaires សាកសួរទៅលើ ទសន្សៈរបស់ប្រជាជន។ 

Very Low Effect	1
Low Effect	2
Medium Effect	3
High Effect	4
Very High Effect	5
ផ្លូវថ្នល់មានអាយុកាលមិនជាប់យូរ ដោយសារកត្តាផ្សេងៗ រួមមាន
Rating of factors responsible for Pavement non durability Level of Effect 1 to 5
Parameters Response (%)	1	2	3	4	5
Poor Design and Construction Factors	7%	14%	19%	44%	29%
Excessive elevations, bends and lack of shoulders	12%	17%	39%	24%	8%
Inadequate thickness of Base/Subbase	3%	10%	14%	35%	8%
Low thickness of Pavement surfacing	2%	9%	22%	32%	36%
Low quality Asphalt	0%	5%	18%	38%	39%
Improper mix design	2%	4%	21%	44%	29%
Lack of drainage/inadequate drainage	1%	7%	19%	33%	40%
Poor embankment design	13%	26%	32%	21%	9%
Corruption/Deliberate use of poor quality of material	1%	3%	3%	22%	71%
Geology Related Factors
Presence of weak/problematic soils	6%	23%	29%	19%	21%
Level of Water table	15%	33%	27%	12%	13%
Presence of faults and fissures	28%	22%	33%	13%	4%
Climate and weather conditions	26%	34%	18%	12%	9%
Road Use Factors
Wrong use of Roads	8%	17%	23%	25%	27%
Excess check points/congestion and unnecessary loads on pav	23%	26%	27%	15%	7%
Maintenance Related Factors
Lack of routine maintenance	6%	13%	24%	23%	35%
Lack of Periodic maintenance	1%	9%	19%	42%	30%
Lack of models generating required time for  maintenance	16%	19%	26%	15%	24%

តារាងស្តង់តាធាតុផ្សំ

Summary of In-situ test results on Enugu-Port Harcourt express way
Parameter		Direction
		Port Harcourt Bound	Enugu Bound
Weaning Course	Wearing Course thickness	46-90mm	20-97mm
	Percentage of samples no
	Voids content	62%	64%
	Bitumen content	20%	0%
	Marshal stability	0%	0%
	Marshal flow	15%	45%
	Aggregate grading	70%	37%
Binder Course	Wearing Course thickness	53-90mm	48-98mm
	Percentage of samples no
	Voids content	0%	10%
	Bitumen content	60%	17%
	Marshal stability	0%	0%
	Marshal flow	0%	0%
	Aggregate grading	60%	100%
Subbase course	%Fines	48%
	Liquid limit	68%
	Plasticity index	56%
	CBR%(soaked)	71%
Subgrade Layer	%Fines	52%
	Liquid limit	53%
	Plasticity index
	CBR%(soaked)

រូបភាពផ្សេងៗ