Soft sandstone modified material

A technology for modifying materials and arsenic sandstone, applied in the field of building materials, can solve the problems of low strength of dam materials, low design standards, difficult construction, etc., and achieve the effects of easy to obtain materials, simple construction methods, and convenient construction.

Active Publication Date: 2014-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing check dams are built directly by stacking and rolling Pisha sandstone. The design standard is low, the strength of the dam body material is low, and the impermeability is poor.
Therefore, check dams are often washed away

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix 75% of loose-grained sandstone, 20% of diagenetic admixture (limestone fine powder), and 5% of ordinary Portland cement (grade 425). Fill in the compaction instrument, heavy compaction 3 times, Ring knife sampling (three samples as a group), standard curing (20±3°C, control humidity greater than 90%), respectively measure the compressive strength and softening coefficient at 28 days and 90 days. The 28-day compressive strength is 4.0MPa, the 90-day compressive strength is 6.0MPa, and the softening coefficient is greater than 0.70.

Embodiment 2

[0030] Mix 70% of loose grainy sandstone, diagenetic admixture (19.5% of lightly burned magnesium powder, 10% of superfine silicon powder), and 0.5% of diagenetic agent (sodium hexametaphosphate), and shape it according to the description in Example 1. For curing, the compressive strength and softening coefficient at 28 days and 90 days were measured respectively. The 28-day compressive strength is 3.0MPa, the 90-day compressive strength is 7.0MPa, and the softening coefficient is greater than 0.7.

Embodiment 3

[0032] Mix 60% of arsenic sandstone, 20% of diagenetic admixture (fly ash), 7% of 32.5-grade general-purpose Portland cement, diagenetic agent (3% of water glass, 1% of sodium sulfate), and 9% of water to mix evenly. into the mold Pressure molding, molding pressure to control the sample density 2.0kg / m 3 It is advisable to naturally maintain the compressive strength for 28 days to 5.0MPa and the softening coefficient to be 0.75.

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Abstract

The invention provides a soft sandstone modified material, and belongs to the field of building materials. The soft sandstone modified material comprises soft sandstone or soft sandstone primary rock, a diagenesis admixture with volcanic ash activity or potential hydraulicity, general purpose Portland cement and water, wherein the mass percent of the diagenesis admixture with volcanic ash activity or potential hydraulicity is 0.5%-60%, the mass percent of the soft sandstone or soft sandstone primary rock is 40%-90%, the mass percent of the general purpose Portland cement is 0.5%-10%, the mass percent of a diagenesis agent is 0.5%-15%, and the mass percent of the water is 5%-20%. The soft sandstone modified material has the advantages of high strength, small air shrinkage deformation, strong water resistance, easiness in obtaining of materials and manufacturing, simplicity and convenience in a construction manner and the like. The compressive strength of the soft sandstone modified material at 90 days can reach 3Mpa-25Mpa, and the soaking softening coefficient of the modified material can be above 0.7.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a modified arsenic sandstone material. Background technique [0002] Pisha sandstone is an incompletely developed mudstone and siltstone whose mineral components are mainly quartz, calcium montmorillonite and calcite, and is mainly distributed in the border areas of Shanxi, Shaanxi and Mongolia. The area where the sandstone is distributed is the most concentrated sand-producing area of ​​clastic bedrock in the Loess Plateau. The coarse sediment that enters the Yellow River accounts for about 62% of the total amount of coarse sediment in the Yellow River. The sandstone is the main source of the yellow sediment in the middle reaches of the Yellow River. In addition, the soil erosion in the Pishasha area is serious, and the terrain is fragmented, which has brought catastrophic effects on the local agricultural development and ecological environment. Every year, our country invests...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/04
Inventor 王立久杨大令张婷婷
Owner DALIAN UNIV OF TECH
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