阅读说明：本技术 一种节省河沙资源的表层风化岩的使用方法 (Using method of surface weathered rock capable of saving river sand resources ) 是由 张虎 孙振均 于 2019-08-28 设计创作，主要内容包括：大自然中石灰石CaCO_3比较容易获得,经过高温锻烧可以形成CaO,掺加一定比例的CaO很好地克服了这个弊端。本方法利用CaO在常温下与水反应生成弱碱性物质Ca(HCO_3)_2,该弱碱物质与表层风化岩中的主要物质SiO_2反应,最终生成中性物质CaSiO_3,这种方法让风化岩替代河沙,把表层风化岩的内部容易产生不稳定因素的杂质去除,降低了路面结构层的成本保护了生态环境。依据反应原理：CaO+SiO_2=CaSiO_3CaO+H_2O+2CO_2=Ca(HCO_3)_2,Ca(HCO_3)_2+SiO_2=CaSiO_3+H_2O+2CO_2。(Limestone CaCO in nature 3 Is easy to obtain, can form CaO after high-temperature calcination, and well overcomes the defect by doping a certain proportion of CaO. The method utilizes the reaction of CaO and water at normal temperature to generate alkalescent substance Ca (HCO) 3 ) 2 The weak alkali substance and SiO which is the main substance in the surface weathered rock 2 Reaction to finally generate a neutral substance CaSiO 3 According to the method, weathered rocks are used for replacing river sand, impurities which are easy to generate unstable factors in the weathered rocks on the surface layer are removed, the cost of a pavement structure layer is reduced, and the ecological environment is protected. According to the reaction principle: CaO + SiO 2 =CaSiO 3 CaO+H 2 O+2CO 2 =Ca(HCO 3 ) 2 ,Ca(HCO 3 ) 2 +SiO 2 =CaSiO 3 +H 2 O+2CO 2 。)

1. The invention provides a method for preparing and adding surface weathered rock instead of river sand, which is characterized in that CaO reacts with water at normal temperature to generate alkalescent substance Ca (HCO)₃)₂The weak alkali substance and SiO which is the main substance in the surface weathered rock₂Reaction to finally generate a neutral substance CaSiO₃The method replaces the river sand with the weathered rock and removes impurities which are easy to generate unstable factors in the weathered rock on the surface layer.

2. The surface weathered rock of the ground in the hilly area (middle east of Shandong) is simply adopted.

3. According to the using amount of the surface weathered rock, the same amount of CaO and one-third of the amount of water are added according to the mass ratio of 3:3:1, the mixture is fully stirred, mixed and reacted, acidic substances in the surface weathered rock are neutralized, and most CaSiO is generated₃A neutral substance.

Technical Field

The present invention belongs to the field of highway engineering material. The surface weathered rock is a natural material which is easy to obtain, is added into a cement stabilized macadam foundation of a pavement as a fine aggregate, is low in cost, but acid substances in the components of the surface weathered rock easily cause pavement cracks. .

Background

The cement stabilized macadam in the current common road base material is widely used, and river sand with better quality must be adopted in the proportion of the fine aggregate. River sand is obtained by deep excavation, has high water taking cost and limited resources, is easy to damage local ecological environment in the excavation process, and is indispensable as fine aggregate in a pavement base course.

Disclosure of Invention

The surface weathered rock is a natural material which is very easy to obtain, river sand which is difficult to obtain in a relatively obtaining mode and high in price is added with a certain formula, and the surface weathered rock is used in some engineering fields instead of the river sand. Chemical composition of surface weathered rock on hilly areas (east and middle mountains):

SiO2	Fe2O3	FeO	Al2O3	CaO	MgO	K2O	Na2O	P2O5	others
										86.12	1.28	0.37	5.82	0.56	0.65	2.12	0.12	0.075	2.885

Limestone CaCO in nature₃Is easy to obtain, can form CaO after high-temperature calcination, and well overcomes the defect by doping a certain proportion of CaO. The method utilizes the reaction of CaO and water at normal temperature to generate alkalescent substance Ca (HCO)₃)₂The weak alkali substance and SiO which is the main substance in the surface weathered rock₂Reaction to finally generate a neutral substance CaSiO₃According to the method, weathered rocks are used for replacing river sand, impurities which are easy to generate unstable factors in the weathered rocks on the surface layer are removed, the cost of a pavement structure layer is reduced, and the ecological environment is protected.

According to the reaction principle: CaO + SiO₂= CaSiO₃

CaO+H₂O+2CO₂= Ca(HCO₃)₂

Ca(HCO₃)₂+ SiO₂= CaSiO₃+ H₂O+2CO₂

The specific implementation mode is as follows:

The invention provides a method for preparing and doping surface weathered rock to replace river sand, which is characterized by comprising the following steps:

(1) solely using weathered rock on the surface of the ground in hilly areas (east and middle of Shandong);

(2) Calcium carbonate CaCO by forced sintering₃(limestone) CaO,

(3) According to the using amount of the surface weathered rock, adding the same amount of CaO and water in a quantity one third times of the surface weathered rock according to the mass ratio of 3:3:1, fully stirring and mixing the mixture for reaction, neutralizing acidic substances in the surface weathered rock, and mostly generating CaSiO₃Neutral substance

(4) And according to the proportion of the fine aggregate in the cement stabilized macadam material of the pavement base, the mixture is added to completely replace river sand.